212 lines
6 KiB
C
212 lines
6 KiB
C
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/*
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* Copyright (C) 2015 - ARM Ltd
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* Author: Marc Zyngier <marc.zyngier@arm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/compiler.h>
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#include <linux/kvm_host.h>
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#include <asm/debug-monitors.h>
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#include <asm/kvm_asm.h>
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#include <asm/kvm_hyp.h>
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#include <asm/kvm_mmu.h>
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#define read_debug(r,n) read_sysreg(r##n##_el1)
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#define write_debug(v,r,n) write_sysreg(v, r##n##_el1)
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#define save_debug(ptr,reg,nr) \
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switch (nr) { \
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case 15: ptr[15] = read_debug(reg, 15); \
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case 14: ptr[14] = read_debug(reg, 14); \
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case 13: ptr[13] = read_debug(reg, 13); \
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case 12: ptr[12] = read_debug(reg, 12); \
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case 11: ptr[11] = read_debug(reg, 11); \
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case 10: ptr[10] = read_debug(reg, 10); \
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case 9: ptr[9] = read_debug(reg, 9); \
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case 8: ptr[8] = read_debug(reg, 8); \
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case 7: ptr[7] = read_debug(reg, 7); \
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case 6: ptr[6] = read_debug(reg, 6); \
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case 5: ptr[5] = read_debug(reg, 5); \
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case 4: ptr[4] = read_debug(reg, 4); \
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case 3: ptr[3] = read_debug(reg, 3); \
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case 2: ptr[2] = read_debug(reg, 2); \
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case 1: ptr[1] = read_debug(reg, 1); \
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default: ptr[0] = read_debug(reg, 0); \
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}
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#define restore_debug(ptr,reg,nr) \
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switch (nr) { \
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case 15: write_debug(ptr[15], reg, 15); \
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case 14: write_debug(ptr[14], reg, 14); \
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case 13: write_debug(ptr[13], reg, 13); \
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case 12: write_debug(ptr[12], reg, 12); \
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case 11: write_debug(ptr[11], reg, 11); \
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case 10: write_debug(ptr[10], reg, 10); \
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case 9: write_debug(ptr[9], reg, 9); \
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case 8: write_debug(ptr[8], reg, 8); \
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case 7: write_debug(ptr[7], reg, 7); \
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case 6: write_debug(ptr[6], reg, 6); \
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case 5: write_debug(ptr[5], reg, 5); \
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case 4: write_debug(ptr[4], reg, 4); \
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case 3: write_debug(ptr[3], reg, 3); \
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case 2: write_debug(ptr[2], reg, 2); \
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case 1: write_debug(ptr[1], reg, 1); \
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default: write_debug(ptr[0], reg, 0); \
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}
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static void __hyp_text __debug_save_spe_nvhe(u64 *pmscr_el1)
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{
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u64 reg;
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/* Clear pmscr in case of early return */
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*pmscr_el1 = 0;
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/* SPE present on this CPU? */
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if (!cpuid_feature_extract_unsigned_field(read_sysreg(id_aa64dfr0_el1),
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ID_AA64DFR0_PMSVER_SHIFT))
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return;
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/* Yes; is it owned by EL3? */
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reg = read_sysreg_s(SYS_PMBIDR_EL1);
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if (reg & BIT(SYS_PMBIDR_EL1_P_SHIFT))
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return;
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/* No; is the host actually using the thing? */
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reg = read_sysreg_s(SYS_PMBLIMITR_EL1);
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if (!(reg & BIT(SYS_PMBLIMITR_EL1_E_SHIFT)))
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return;
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/* Yes; save the control register and disable data generation */
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*pmscr_el1 = read_sysreg_s(SYS_PMSCR_EL1);
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write_sysreg_s(0, SYS_PMSCR_EL1);
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isb();
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/* Now drain all buffered data to memory */
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psb_csync();
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dsb(nsh);
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}
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static void __hyp_text __debug_restore_spe_nvhe(u64 pmscr_el1)
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{
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if (!pmscr_el1)
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return;
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/* The host page table is installed, but not yet synchronised */
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isb();
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/* Re-enable data generation */
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write_sysreg_s(pmscr_el1, SYS_PMSCR_EL1);
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}
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static void __hyp_text __debug_save_state(struct kvm_vcpu *vcpu,
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struct kvm_guest_debug_arch *dbg,
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struct kvm_cpu_context *ctxt)
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{
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u64 aa64dfr0;
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int brps, wrps;
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aa64dfr0 = read_sysreg(id_aa64dfr0_el1);
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brps = (aa64dfr0 >> 12) & 0xf;
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wrps = (aa64dfr0 >> 20) & 0xf;
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save_debug(dbg->dbg_bcr, dbgbcr, brps);
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save_debug(dbg->dbg_bvr, dbgbvr, brps);
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save_debug(dbg->dbg_wcr, dbgwcr, wrps);
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save_debug(dbg->dbg_wvr, dbgwvr, wrps);
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ctxt->sys_regs[MDCCINT_EL1] = read_sysreg(mdccint_el1);
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}
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static void __hyp_text __debug_restore_state(struct kvm_vcpu *vcpu,
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struct kvm_guest_debug_arch *dbg,
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struct kvm_cpu_context *ctxt)
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{
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u64 aa64dfr0;
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int brps, wrps;
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aa64dfr0 = read_sysreg(id_aa64dfr0_el1);
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brps = (aa64dfr0 >> 12) & 0xf;
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wrps = (aa64dfr0 >> 20) & 0xf;
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restore_debug(dbg->dbg_bcr, dbgbcr, brps);
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restore_debug(dbg->dbg_bvr, dbgbvr, brps);
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restore_debug(dbg->dbg_wcr, dbgwcr, wrps);
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restore_debug(dbg->dbg_wvr, dbgwvr, wrps);
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write_sysreg(ctxt->sys_regs[MDCCINT_EL1], mdccint_el1);
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}
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void __hyp_text __debug_save_host_buffers_nvhe(struct kvm_vcpu *vcpu)
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{
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/*
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* Non-VHE: Disable and flush SPE data generation
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* VHE: The vcpu can run, but it can't hide.
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*/
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__debug_save_spe_nvhe(&vcpu->arch.host_debug_state.pmscr_el1);
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}
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void __hyp_text __debug_restore_host_buffers_nvhe(struct kvm_vcpu *vcpu)
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{
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__debug_restore_spe_nvhe(vcpu->arch.host_debug_state.pmscr_el1);
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}
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void __hyp_text __debug_switch_to_guest(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpu_context *host_ctxt;
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struct kvm_cpu_context *guest_ctxt;
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struct kvm_guest_debug_arch *host_dbg;
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struct kvm_guest_debug_arch *guest_dbg;
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if (!(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY))
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return;
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host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context);
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guest_ctxt = &vcpu->arch.ctxt;
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host_dbg = &vcpu->arch.host_debug_state.regs;
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guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr);
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__debug_save_state(vcpu, host_dbg, host_ctxt);
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__debug_restore_state(vcpu, guest_dbg, guest_ctxt);
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}
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void __hyp_text __debug_switch_to_host(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpu_context *host_ctxt;
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struct kvm_cpu_context *guest_ctxt;
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struct kvm_guest_debug_arch *host_dbg;
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struct kvm_guest_debug_arch *guest_dbg;
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if (!(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY))
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return;
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host_ctxt = kern_hyp_va(vcpu->arch.host_cpu_context);
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guest_ctxt = &vcpu->arch.ctxt;
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host_dbg = &vcpu->arch.host_debug_state.regs;
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guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr);
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__debug_save_state(vcpu, guest_dbg, guest_ctxt);
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__debug_restore_state(vcpu, host_dbg, host_ctxt);
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vcpu->arch.flags &= ~KVM_ARM64_DEBUG_DIRTY;
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}
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u32 __hyp_text __kvm_get_mdcr_el2(void)
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{
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return read_sysreg(mdcr_el2);
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}
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