976 lines
24 KiB
C
976 lines
24 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_PARAVIRT_H
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#define _ASM_X86_PARAVIRT_H
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/* Various instructions on x86 need to be replaced for
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* para-virtualization: those hooks are defined here. */
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#ifdef CONFIG_PARAVIRT
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#include <asm/pgtable_types.h>
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#include <asm/asm.h>
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#include <asm/nospec-branch.h>
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#include <asm/paravirt_types.h>
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#ifndef __ASSEMBLY__
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#include <linux/bug.h>
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#include <linux/types.h>
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#include <linux/cpumask.h>
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#include <asm/frame.h>
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static inline void load_sp0(unsigned long sp0)
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{
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PVOP_VCALL1(pv_cpu_ops.load_sp0, sp0);
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}
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/* The paravirtualized CPUID instruction. */
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static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx)
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{
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PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
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}
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/*
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* These special macros can be used to get or set a debugging register
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*/
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static inline unsigned long paravirt_get_debugreg(int reg)
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{
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return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
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}
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#define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
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static inline void set_debugreg(unsigned long val, int reg)
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{
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PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
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}
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static inline unsigned long read_cr0(void)
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{
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return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
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}
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static inline void write_cr0(unsigned long x)
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{
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PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
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}
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static inline unsigned long read_cr2(void)
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{
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return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
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}
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static inline void write_cr2(unsigned long x)
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{
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PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
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}
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static inline unsigned long __read_cr3(void)
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{
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return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
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}
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static inline void write_cr3(unsigned long x)
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{
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PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
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}
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static inline void __write_cr4(unsigned long x)
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{
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PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
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}
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#ifdef CONFIG_X86_64
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static inline unsigned long read_cr8(void)
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{
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return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
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}
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static inline void write_cr8(unsigned long x)
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{
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PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
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}
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#endif
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static inline void arch_safe_halt(void)
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{
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PVOP_VCALL0(pv_irq_ops.safe_halt);
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}
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static inline void halt(void)
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{
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PVOP_VCALL0(pv_irq_ops.halt);
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}
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static inline void wbinvd(void)
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{
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PVOP_VCALL0(pv_cpu_ops.wbinvd);
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}
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#define get_kernel_rpl() (pv_info.kernel_rpl)
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static inline u64 paravirt_read_msr(unsigned msr)
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{
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return PVOP_CALL1(u64, pv_cpu_ops.read_msr, msr);
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}
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static inline void paravirt_write_msr(unsigned msr,
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unsigned low, unsigned high)
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{
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PVOP_VCALL3(pv_cpu_ops.write_msr, msr, low, high);
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}
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static inline u64 paravirt_read_msr_safe(unsigned msr, int *err)
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{
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return PVOP_CALL2(u64, pv_cpu_ops.read_msr_safe, msr, err);
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}
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static inline int paravirt_write_msr_safe(unsigned msr,
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unsigned low, unsigned high)
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{
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return PVOP_CALL3(int, pv_cpu_ops.write_msr_safe, msr, low, high);
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}
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#define rdmsr(msr, val1, val2) \
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do { \
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u64 _l = paravirt_read_msr(msr); \
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val1 = (u32)_l; \
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val2 = _l >> 32; \
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} while (0)
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#define wrmsr(msr, val1, val2) \
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do { \
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paravirt_write_msr(msr, val1, val2); \
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} while (0)
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#define rdmsrl(msr, val) \
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do { \
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val = paravirt_read_msr(msr); \
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} while (0)
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static inline void wrmsrl(unsigned msr, u64 val)
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{
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wrmsr(msr, (u32)val, (u32)(val>>32));
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}
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#define wrmsr_safe(msr, a, b) paravirt_write_msr_safe(msr, a, b)
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/* rdmsr with exception handling */
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#define rdmsr_safe(msr, a, b) \
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({ \
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int _err; \
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u64 _l = paravirt_read_msr_safe(msr, &_err); \
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(*a) = (u32)_l; \
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(*b) = _l >> 32; \
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_err; \
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})
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static inline int rdmsrl_safe(unsigned msr, unsigned long long *p)
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{
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int err;
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*p = paravirt_read_msr_safe(msr, &err);
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return err;
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}
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static inline unsigned long long paravirt_sched_clock(void)
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{
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return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
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}
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struct static_key;
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extern struct static_key paravirt_steal_enabled;
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extern struct static_key paravirt_steal_rq_enabled;
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static inline u64 paravirt_steal_clock(int cpu)
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{
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return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu);
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}
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static inline unsigned long long paravirt_read_pmc(int counter)
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{
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return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
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}
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#define rdpmc(counter, low, high) \
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do { \
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u64 _l = paravirt_read_pmc(counter); \
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low = (u32)_l; \
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high = _l >> 32; \
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} while (0)
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#define rdpmcl(counter, val) ((val) = paravirt_read_pmc(counter))
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static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
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{
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PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
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}
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static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
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{
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PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
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}
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static inline void load_TR_desc(void)
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{
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PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
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}
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static inline void load_gdt(const struct desc_ptr *dtr)
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{
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PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
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}
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static inline void load_idt(const struct desc_ptr *dtr)
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{
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PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
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}
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static inline void set_ldt(const void *addr, unsigned entries)
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{
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PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
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}
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static inline unsigned long paravirt_store_tr(void)
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{
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return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
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}
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#define store_tr(tr) ((tr) = paravirt_store_tr())
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static inline void load_TLS(struct thread_struct *t, unsigned cpu)
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{
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PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
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}
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#ifdef CONFIG_X86_64
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static inline void load_gs_index(unsigned int gs)
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{
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PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
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}
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#endif
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static inline void write_ldt_entry(struct desc_struct *dt, int entry,
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const void *desc)
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{
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PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
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}
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static inline void write_gdt_entry(struct desc_struct *dt, int entry,
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void *desc, int type)
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{
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PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
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}
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static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
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{
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PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
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}
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static inline void set_iopl_mask(unsigned mask)
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{
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PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
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}
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/* The paravirtualized I/O functions */
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static inline void slow_down_io(void)
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{
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pv_cpu_ops.io_delay();
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#ifdef REALLY_SLOW_IO
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pv_cpu_ops.io_delay();
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pv_cpu_ops.io_delay();
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pv_cpu_ops.io_delay();
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#endif
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}
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static inline void paravirt_activate_mm(struct mm_struct *prev,
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struct mm_struct *next)
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{
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PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
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}
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static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
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struct mm_struct *mm)
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{
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PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
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}
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static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
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{
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PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
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}
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static inline void __flush_tlb(void)
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{
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PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
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}
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static inline void __flush_tlb_global(void)
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{
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PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
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}
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static inline void __flush_tlb_one_user(unsigned long addr)
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{
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PVOP_VCALL1(pv_mmu_ops.flush_tlb_one_user, addr);
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}
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static inline void flush_tlb_others(const struct cpumask *cpumask,
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const struct flush_tlb_info *info)
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{
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PVOP_VCALL2(pv_mmu_ops.flush_tlb_others, cpumask, info);
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}
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static inline void paravirt_tlb_remove_table(struct mmu_gather *tlb, void *table)
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{
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PVOP_VCALL2(pv_mmu_ops.tlb_remove_table, tlb, table);
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}
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static inline int paravirt_pgd_alloc(struct mm_struct *mm)
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{
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return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
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}
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static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
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{
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PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
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}
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static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
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{
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PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
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}
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static inline void paravirt_release_pte(unsigned long pfn)
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{
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PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
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}
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static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
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{
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PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
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}
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static inline void paravirt_release_pmd(unsigned long pfn)
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{
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PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
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}
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static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
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{
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PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
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}
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static inline void paravirt_release_pud(unsigned long pfn)
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{
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PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
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}
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static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn)
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{
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PVOP_VCALL2(pv_mmu_ops.alloc_p4d, mm, pfn);
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}
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static inline void paravirt_release_p4d(unsigned long pfn)
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{
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PVOP_VCALL1(pv_mmu_ops.release_p4d, pfn);
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}
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static inline pte_t __pte(pteval_t val)
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{
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pteval_t ret;
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if (sizeof(pteval_t) > sizeof(long))
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ret = PVOP_CALLEE2(pteval_t,
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pv_mmu_ops.make_pte,
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val, (u64)val >> 32);
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else
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ret = PVOP_CALLEE1(pteval_t,
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pv_mmu_ops.make_pte,
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val);
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return (pte_t) { .pte = ret };
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}
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static inline pteval_t pte_val(pte_t pte)
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{
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pteval_t ret;
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if (sizeof(pteval_t) > sizeof(long))
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ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
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pte.pte, (u64)pte.pte >> 32);
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else
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ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
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pte.pte);
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return ret;
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}
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static inline pgd_t __pgd(pgdval_t val)
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{
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pgdval_t ret;
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if (sizeof(pgdval_t) > sizeof(long))
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ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
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val, (u64)val >> 32);
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else
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ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
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val);
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return (pgd_t) { ret };
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}
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static inline pgdval_t pgd_val(pgd_t pgd)
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{
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pgdval_t ret;
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if (sizeof(pgdval_t) > sizeof(long))
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ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
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pgd.pgd, (u64)pgd.pgd >> 32);
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else
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ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
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pgd.pgd);
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return ret;
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}
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#define __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
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static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep)
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{
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pteval_t ret;
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ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
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mm, addr, ptep);
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return (pte_t) { .pte = ret };
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}
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static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte)
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{
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if (sizeof(pteval_t) > sizeof(long))
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/* 5 arg words */
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pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
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else
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PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
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mm, addr, ptep, pte.pte);
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}
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static inline void set_pte(pte_t *ptep, pte_t pte)
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{
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if (sizeof(pteval_t) > sizeof(long))
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PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
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pte.pte, (u64)pte.pte >> 32);
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else
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PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
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pte.pte);
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}
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static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pte)
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{
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if (sizeof(pteval_t) > sizeof(long))
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/* 5 arg words */
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pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
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else
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PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
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}
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static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
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{
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pmdval_t val = native_pmd_val(pmd);
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if (sizeof(pmdval_t) > sizeof(long))
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PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
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else
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PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
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}
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#if CONFIG_PGTABLE_LEVELS >= 3
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static inline pmd_t __pmd(pmdval_t val)
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{
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pmdval_t ret;
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if (sizeof(pmdval_t) > sizeof(long))
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ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
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val, (u64)val >> 32);
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else
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ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
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val);
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return (pmd_t) { ret };
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}
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static inline pmdval_t pmd_val(pmd_t pmd)
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{
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pmdval_t ret;
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if (sizeof(pmdval_t) > sizeof(long))
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ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
|
|
pmd.pmd, (u64)pmd.pmd >> 32);
|
|
else
|
|
ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
|
|
pmd.pmd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline void set_pud(pud_t *pudp, pud_t pud)
|
|
{
|
|
pudval_t val = native_pud_val(pud);
|
|
|
|
if (sizeof(pudval_t) > sizeof(long))
|
|
PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
|
|
val, (u64)val >> 32);
|
|
else
|
|
PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
|
|
val);
|
|
}
|
|
#if CONFIG_PGTABLE_LEVELS >= 4
|
|
static inline pud_t __pud(pudval_t val)
|
|
{
|
|
pudval_t ret;
|
|
|
|
if (sizeof(pudval_t) > sizeof(long))
|
|
ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
|
|
val, (u64)val >> 32);
|
|
else
|
|
ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
|
|
val);
|
|
|
|
return (pud_t) { ret };
|
|
}
|
|
|
|
static inline pudval_t pud_val(pud_t pud)
|
|
{
|
|
pudval_t ret;
|
|
|
|
if (sizeof(pudval_t) > sizeof(long))
|
|
ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
|
|
pud.pud, (u64)pud.pud >> 32);
|
|
else
|
|
ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
|
|
pud.pud);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline void pud_clear(pud_t *pudp)
|
|
{
|
|
set_pud(pudp, __pud(0));
|
|
}
|
|
|
|
static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
|
|
{
|
|
p4dval_t val = native_p4d_val(p4d);
|
|
|
|
if (sizeof(p4dval_t) > sizeof(long))
|
|
PVOP_VCALL3(pv_mmu_ops.set_p4d, p4dp,
|
|
val, (u64)val >> 32);
|
|
else
|
|
PVOP_VCALL2(pv_mmu_ops.set_p4d, p4dp,
|
|
val);
|
|
}
|
|
|
|
#if CONFIG_PGTABLE_LEVELS >= 5
|
|
|
|
static inline p4d_t __p4d(p4dval_t val)
|
|
{
|
|
p4dval_t ret = PVOP_CALLEE1(p4dval_t, pv_mmu_ops.make_p4d, val);
|
|
|
|
return (p4d_t) { ret };
|
|
}
|
|
|
|
static inline p4dval_t p4d_val(p4d_t p4d)
|
|
{
|
|
return PVOP_CALLEE1(p4dval_t, pv_mmu_ops.p4d_val, p4d.p4d);
|
|
}
|
|
|
|
static inline void __set_pgd(pgd_t *pgdp, pgd_t pgd)
|
|
{
|
|
PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp, native_pgd_val(pgd));
|
|
}
|
|
|
|
#define set_pgd(pgdp, pgdval) do { \
|
|
if (pgtable_l5_enabled()) \
|
|
__set_pgd(pgdp, pgdval); \
|
|
else \
|
|
set_p4d((p4d_t *)(pgdp), (p4d_t) { (pgdval).pgd }); \
|
|
} while (0)
|
|
|
|
#define pgd_clear(pgdp) do { \
|
|
if (pgtable_l5_enabled()) \
|
|
set_pgd(pgdp, __pgd(0)); \
|
|
} while (0)
|
|
|
|
#endif /* CONFIG_PGTABLE_LEVELS == 5 */
|
|
|
|
static inline void p4d_clear(p4d_t *p4dp)
|
|
{
|
|
set_p4d(p4dp, __p4d(0));
|
|
}
|
|
|
|
#endif /* CONFIG_PGTABLE_LEVELS == 4 */
|
|
|
|
#endif /* CONFIG_PGTABLE_LEVELS >= 3 */
|
|
|
|
#ifdef CONFIG_X86_PAE
|
|
/* Special-case pte-setting operations for PAE, which can't update a
|
|
64-bit pte atomically */
|
|
static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
|
|
{
|
|
PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
|
|
pte.pte, pte.pte >> 32);
|
|
}
|
|
|
|
static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
|
|
pte_t *ptep)
|
|
{
|
|
PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
|
|
}
|
|
|
|
static inline void pmd_clear(pmd_t *pmdp)
|
|
{
|
|
PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
|
|
}
|
|
#else /* !CONFIG_X86_PAE */
|
|
static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
|
|
{
|
|
set_pte(ptep, pte);
|
|
}
|
|
|
|
static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
|
|
pte_t *ptep)
|
|
{
|
|
set_pte_at(mm, addr, ptep, __pte(0));
|
|
}
|
|
|
|
static inline void pmd_clear(pmd_t *pmdp)
|
|
{
|
|
set_pmd(pmdp, __pmd(0));
|
|
}
|
|
#endif /* CONFIG_X86_PAE */
|
|
|
|
#define __HAVE_ARCH_START_CONTEXT_SWITCH
|
|
static inline void arch_start_context_switch(struct task_struct *prev)
|
|
{
|
|
PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
|
|
}
|
|
|
|
static inline void arch_end_context_switch(struct task_struct *next)
|
|
{
|
|
PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
|
|
}
|
|
|
|
#define __HAVE_ARCH_ENTER_LAZY_MMU_MODE
|
|
static inline void arch_enter_lazy_mmu_mode(void)
|
|
{
|
|
PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
|
|
}
|
|
|
|
static inline void arch_leave_lazy_mmu_mode(void)
|
|
{
|
|
PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
|
|
}
|
|
|
|
static inline void arch_flush_lazy_mmu_mode(void)
|
|
{
|
|
PVOP_VCALL0(pv_mmu_ops.lazy_mode.flush);
|
|
}
|
|
|
|
static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
|
|
phys_addr_t phys, pgprot_t flags)
|
|
{
|
|
pv_mmu_ops.set_fixmap(idx, phys, flags);
|
|
}
|
|
|
|
#if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)
|
|
|
|
static __always_inline void pv_queued_spin_lock_slowpath(struct qspinlock *lock,
|
|
u32 val)
|
|
{
|
|
PVOP_VCALL2(pv_lock_ops.queued_spin_lock_slowpath, lock, val);
|
|
}
|
|
|
|
static __always_inline void pv_queued_spin_unlock(struct qspinlock *lock)
|
|
{
|
|
PVOP_VCALLEE1(pv_lock_ops.queued_spin_unlock, lock);
|
|
}
|
|
|
|
static __always_inline void pv_wait(u8 *ptr, u8 val)
|
|
{
|
|
PVOP_VCALL2(pv_lock_ops.wait, ptr, val);
|
|
}
|
|
|
|
static __always_inline void pv_kick(int cpu)
|
|
{
|
|
PVOP_VCALL1(pv_lock_ops.kick, cpu);
|
|
}
|
|
|
|
static __always_inline bool pv_vcpu_is_preempted(long cpu)
|
|
{
|
|
return PVOP_CALLEE1(bool, pv_lock_ops.vcpu_is_preempted, cpu);
|
|
}
|
|
|
|
#endif /* SMP && PARAVIRT_SPINLOCKS */
|
|
|
|
#ifdef CONFIG_X86_32
|
|
#define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
|
|
#define PV_RESTORE_REGS "popl %edx; popl %ecx;"
|
|
|
|
/* save and restore all caller-save registers, except return value */
|
|
#define PV_SAVE_ALL_CALLER_REGS "pushl %ecx;"
|
|
#define PV_RESTORE_ALL_CALLER_REGS "popl %ecx;"
|
|
|
|
#define PV_FLAGS_ARG "0"
|
|
#define PV_EXTRA_CLOBBERS
|
|
#define PV_VEXTRA_CLOBBERS
|
|
#else
|
|
/* save and restore all caller-save registers, except return value */
|
|
#define PV_SAVE_ALL_CALLER_REGS \
|
|
"push %rcx;" \
|
|
"push %rdx;" \
|
|
"push %rsi;" \
|
|
"push %rdi;" \
|
|
"push %r8;" \
|
|
"push %r9;" \
|
|
"push %r10;" \
|
|
"push %r11;"
|
|
#define PV_RESTORE_ALL_CALLER_REGS \
|
|
"pop %r11;" \
|
|
"pop %r10;" \
|
|
"pop %r9;" \
|
|
"pop %r8;" \
|
|
"pop %rdi;" \
|
|
"pop %rsi;" \
|
|
"pop %rdx;" \
|
|
"pop %rcx;"
|
|
|
|
/* We save some registers, but all of them, that's too much. We clobber all
|
|
* caller saved registers but the argument parameter */
|
|
#define PV_SAVE_REGS "pushq %%rdi;"
|
|
#define PV_RESTORE_REGS "popq %%rdi;"
|
|
#define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
|
|
#define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
|
|
#define PV_FLAGS_ARG "D"
|
|
#endif
|
|
|
|
/*
|
|
* Generate a thunk around a function which saves all caller-save
|
|
* registers except for the return value. This allows C functions to
|
|
* be called from assembler code where fewer than normal registers are
|
|
* available. It may also help code generation around calls from C
|
|
* code if the common case doesn't use many registers.
|
|
*
|
|
* When a callee is wrapped in a thunk, the caller can assume that all
|
|
* arg regs and all scratch registers are preserved across the
|
|
* call. The return value in rax/eax will not be saved, even for void
|
|
* functions.
|
|
*/
|
|
#define PV_THUNK_NAME(func) "__raw_callee_save_" #func
|
|
#define PV_CALLEE_SAVE_REGS_THUNK(func) \
|
|
extern typeof(func) __raw_callee_save_##func; \
|
|
\
|
|
asm(".pushsection .text;" \
|
|
".globl " PV_THUNK_NAME(func) ";" \
|
|
".type " PV_THUNK_NAME(func) ", @function;" \
|
|
PV_THUNK_NAME(func) ":" \
|
|
FRAME_BEGIN \
|
|
PV_SAVE_ALL_CALLER_REGS \
|
|
"call " #func ";" \
|
|
PV_RESTORE_ALL_CALLER_REGS \
|
|
FRAME_END \
|
|
"ret;" \
|
|
".size " PV_THUNK_NAME(func) ", .-" PV_THUNK_NAME(func) ";" \
|
|
".popsection")
|
|
|
|
/* Get a reference to a callee-save function */
|
|
#define PV_CALLEE_SAVE(func) \
|
|
((struct paravirt_callee_save) { __raw_callee_save_##func })
|
|
|
|
/* Promise that "func" already uses the right calling convention */
|
|
#define __PV_IS_CALLEE_SAVE(func) \
|
|
((struct paravirt_callee_save) { func })
|
|
|
|
static inline notrace unsigned long arch_local_save_flags(void)
|
|
{
|
|
return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
|
|
}
|
|
|
|
static inline notrace void arch_local_irq_restore(unsigned long f)
|
|
{
|
|
PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
|
|
}
|
|
|
|
static inline notrace void arch_local_irq_disable(void)
|
|
{
|
|
PVOP_VCALLEE0(pv_irq_ops.irq_disable);
|
|
}
|
|
|
|
static inline notrace void arch_local_irq_enable(void)
|
|
{
|
|
PVOP_VCALLEE0(pv_irq_ops.irq_enable);
|
|
}
|
|
|
|
static inline notrace unsigned long arch_local_irq_save(void)
|
|
{
|
|
unsigned long f;
|
|
|
|
f = arch_local_save_flags();
|
|
arch_local_irq_disable();
|
|
return f;
|
|
}
|
|
|
|
|
|
/* Make sure as little as possible of this mess escapes. */
|
|
#undef PARAVIRT_CALL
|
|
#undef __PVOP_CALL
|
|
#undef __PVOP_VCALL
|
|
#undef PVOP_VCALL0
|
|
#undef PVOP_CALL0
|
|
#undef PVOP_VCALL1
|
|
#undef PVOP_CALL1
|
|
#undef PVOP_VCALL2
|
|
#undef PVOP_CALL2
|
|
#undef PVOP_VCALL3
|
|
#undef PVOP_CALL3
|
|
#undef PVOP_VCALL4
|
|
#undef PVOP_CALL4
|
|
|
|
extern void default_banner(void);
|
|
|
|
#else /* __ASSEMBLY__ */
|
|
|
|
#define _PVSITE(ptype, clobbers, ops, word, algn) \
|
|
771:; \
|
|
ops; \
|
|
772:; \
|
|
.pushsection .parainstructions,"a"; \
|
|
.align algn; \
|
|
word 771b; \
|
|
.byte ptype; \
|
|
.byte 772b-771b; \
|
|
.short clobbers; \
|
|
.popsection
|
|
|
|
|
|
#define COND_PUSH(set, mask, reg) \
|
|
.if ((~(set)) & mask); push %reg; .endif
|
|
#define COND_POP(set, mask, reg) \
|
|
.if ((~(set)) & mask); pop %reg; .endif
|
|
|
|
#ifdef CONFIG_X86_64
|
|
|
|
#define PV_SAVE_REGS(set) \
|
|
COND_PUSH(set, CLBR_RAX, rax); \
|
|
COND_PUSH(set, CLBR_RCX, rcx); \
|
|
COND_PUSH(set, CLBR_RDX, rdx); \
|
|
COND_PUSH(set, CLBR_RSI, rsi); \
|
|
COND_PUSH(set, CLBR_RDI, rdi); \
|
|
COND_PUSH(set, CLBR_R8, r8); \
|
|
COND_PUSH(set, CLBR_R9, r9); \
|
|
COND_PUSH(set, CLBR_R10, r10); \
|
|
COND_PUSH(set, CLBR_R11, r11)
|
|
#define PV_RESTORE_REGS(set) \
|
|
COND_POP(set, CLBR_R11, r11); \
|
|
COND_POP(set, CLBR_R10, r10); \
|
|
COND_POP(set, CLBR_R9, r9); \
|
|
COND_POP(set, CLBR_R8, r8); \
|
|
COND_POP(set, CLBR_RDI, rdi); \
|
|
COND_POP(set, CLBR_RSI, rsi); \
|
|
COND_POP(set, CLBR_RDX, rdx); \
|
|
COND_POP(set, CLBR_RCX, rcx); \
|
|
COND_POP(set, CLBR_RAX, rax)
|
|
|
|
#define PARA_PATCH(struct, off) ((PARAVIRT_PATCH_##struct + (off)) / 8)
|
|
#define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
|
|
#define PARA_INDIRECT(addr) *addr(%rip)
|
|
#else
|
|
#define PV_SAVE_REGS(set) \
|
|
COND_PUSH(set, CLBR_EAX, eax); \
|
|
COND_PUSH(set, CLBR_EDI, edi); \
|
|
COND_PUSH(set, CLBR_ECX, ecx); \
|
|
COND_PUSH(set, CLBR_EDX, edx)
|
|
#define PV_RESTORE_REGS(set) \
|
|
COND_POP(set, CLBR_EDX, edx); \
|
|
COND_POP(set, CLBR_ECX, ecx); \
|
|
COND_POP(set, CLBR_EDI, edi); \
|
|
COND_POP(set, CLBR_EAX, eax)
|
|
|
|
#define PARA_PATCH(struct, off) ((PARAVIRT_PATCH_##struct + (off)) / 4)
|
|
#define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
|
|
#define PARA_INDIRECT(addr) *%cs:addr
|
|
#endif
|
|
|
|
#define INTERRUPT_RETURN \
|
|
PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE, \
|
|
ANNOTATE_RETPOLINE_SAFE; \
|
|
jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret);)
|
|
|
|
#define DISABLE_INTERRUPTS(clobbers) \
|
|
PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
|
|
PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE); \
|
|
ANNOTATE_RETPOLINE_SAFE; \
|
|
call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable); \
|
|
PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
|
|
|
|
#define ENABLE_INTERRUPTS(clobbers) \
|
|
PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers, \
|
|
PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE); \
|
|
ANNOTATE_RETPOLINE_SAFE; \
|
|
call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable); \
|
|
PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
|
|
|
|
#ifdef CONFIG_X86_32
|
|
#define GET_CR0_INTO_EAX \
|
|
push %ecx; push %edx; \
|
|
ANNOTATE_RETPOLINE_SAFE; \
|
|
call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0); \
|
|
pop %edx; pop %ecx
|
|
#else /* !CONFIG_X86_32 */
|
|
|
|
/*
|
|
* If swapgs is used while the userspace stack is still current,
|
|
* there's no way to call a pvop. The PV replacement *must* be
|
|
* inlined, or the swapgs instruction must be trapped and emulated.
|
|
*/
|
|
#define SWAPGS_UNSAFE_STACK \
|
|
PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE, \
|
|
swapgs)
|
|
|
|
/*
|
|
* Note: swapgs is very special, and in practise is either going to be
|
|
* implemented with a single "swapgs" instruction or something very
|
|
* special. Either way, we don't need to save any registers for
|
|
* it.
|
|
*/
|
|
#define SWAPGS \
|
|
PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE, \
|
|
ANNOTATE_RETPOLINE_SAFE; \
|
|
call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs); \
|
|
)
|
|
|
|
#define GET_CR2_INTO_RAX \
|
|
ANNOTATE_RETPOLINE_SAFE; \
|
|
call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2);
|
|
|
|
#define USERGS_SYSRET64 \
|
|
PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64), \
|
|
CLBR_NONE, \
|
|
ANNOTATE_RETPOLINE_SAFE; \
|
|
jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64);)
|
|
|
|
#ifdef CONFIG_DEBUG_ENTRY
|
|
#define SAVE_FLAGS(clobbers) \
|
|
PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_save_fl), clobbers, \
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PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE); \
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|
ANNOTATE_RETPOLINE_SAFE; \
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|
call PARA_INDIRECT(pv_irq_ops+PV_IRQ_save_fl); \
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|
PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
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|
#endif
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|
|
|
#endif /* CONFIG_X86_32 */
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|
|
|
#endif /* __ASSEMBLY__ */
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|
#else /* CONFIG_PARAVIRT */
|
|
# define default_banner x86_init_noop
|
|
#ifndef __ASSEMBLY__
|
|
static inline void paravirt_arch_dup_mmap(struct mm_struct *oldmm,
|
|
struct mm_struct *mm)
|
|
{
|
|
}
|
|
|
|
static inline void paravirt_arch_exit_mmap(struct mm_struct *mm)
|
|
{
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|
}
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|
#endif /* __ASSEMBLY__ */
|
|
#endif /* !CONFIG_PARAVIRT */
|
|
#endif /* _ASM_X86_PARAVIRT_H */
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