diff options
Diffstat (limited to 'arch/arm64/kvm/hyp/include/hyp/debug-sr.h')
| -rw-r--r-- | arch/arm64/kvm/hyp/include/hyp/debug-sr.h | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/arch/arm64/kvm/hyp/include/hyp/debug-sr.h b/arch/arm64/kvm/hyp/include/hyp/debug-sr.h new file mode 100644 index 000000000000..0297dc63988c --- /dev/null +++ b/arch/arm64/kvm/hyp/include/hyp/debug-sr.h @@ -0,0 +1,168 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2015 - ARM Ltd + * Author: Marc Zyngier <marc.zyngier@arm.com> + */ + +#ifndef __ARM64_KVM_HYP_DEBUG_SR_H__ +#define __ARM64_KVM_HYP_DEBUG_SR_H__ + +#include <linux/compiler.h> +#include <linux/kvm_host.h> + +#include <asm/debug-monitors.h> +#include <asm/kvm_asm.h> +#include <asm/kvm_hyp.h> +#include <asm/kvm_mmu.h> + +#define read_debug(r,n) read_sysreg(r##n##_el1) +#define write_debug(v,r,n) write_sysreg(v, r##n##_el1) + +#define save_debug(ptr,reg,nr) \ + switch (nr) { \ + case 15: ptr[15] = read_debug(reg, 15); \ + /* Fall through */ \ + case 14: ptr[14] = read_debug(reg, 14); \ + /* Fall through */ \ + case 13: ptr[13] = read_debug(reg, 13); \ + /* Fall through */ \ + case 12: ptr[12] = read_debug(reg, 12); \ + /* Fall through */ \ + case 11: ptr[11] = read_debug(reg, 11); \ + /* Fall through */ \ + case 10: ptr[10] = read_debug(reg, 10); \ + /* Fall through */ \ + case 9: ptr[9] = read_debug(reg, 9); \ + /* Fall through */ \ + case 8: ptr[8] = read_debug(reg, 8); \ + /* Fall through */ \ + case 7: ptr[7] = read_debug(reg, 7); \ + /* Fall through */ \ + case 6: ptr[6] = read_debug(reg, 6); \ + /* Fall through */ \ + case 5: ptr[5] = read_debug(reg, 5); \ + /* Fall through */ \ + case 4: ptr[4] = read_debug(reg, 4); \ + /* Fall through */ \ + case 3: ptr[3] = read_debug(reg, 3); \ + /* Fall through */ \ + case 2: ptr[2] = read_debug(reg, 2); \ + /* Fall through */ \ + case 1: ptr[1] = read_debug(reg, 1); \ + /* Fall through */ \ + default: ptr[0] = read_debug(reg, 0); \ + } + +#define restore_debug(ptr,reg,nr) \ + switch (nr) { \ + case 15: write_debug(ptr[15], reg, 15); \ + /* Fall through */ \ + case 14: write_debug(ptr[14], reg, 14); \ + /* Fall through */ \ + case 13: write_debug(ptr[13], reg, 13); \ + /* Fall through */ \ + case 12: write_debug(ptr[12], reg, 12); \ + /* Fall through */ \ + case 11: write_debug(ptr[11], reg, 11); \ + /* Fall through */ \ + case 10: write_debug(ptr[10], reg, 10); \ + /* Fall through */ \ + case 9: write_debug(ptr[9], reg, 9); \ + /* Fall through */ \ + case 8: write_debug(ptr[8], reg, 8); \ + /* Fall through */ \ + case 7: write_debug(ptr[7], reg, 7); \ + /* Fall through */ \ + case 6: write_debug(ptr[6], reg, 6); \ + /* Fall through */ \ + case 5: write_debug(ptr[5], reg, 5); \ + /* Fall through */ \ + case 4: write_debug(ptr[4], reg, 4); \ + /* Fall through */ \ + case 3: write_debug(ptr[3], reg, 3); \ + /* Fall through */ \ + case 2: write_debug(ptr[2], reg, 2); \ + /* Fall through */ \ + case 1: write_debug(ptr[1], reg, 1); \ + /* Fall through */ \ + default: write_debug(ptr[0], reg, 0); \ + } + +static void __debug_save_state(struct kvm_guest_debug_arch *dbg, + struct kvm_cpu_context *ctxt) +{ + u64 aa64dfr0; + int brps, wrps; + + aa64dfr0 = read_sysreg(id_aa64dfr0_el1); + brps = (aa64dfr0 >> 12) & 0xf; + wrps = (aa64dfr0 >> 20) & 0xf; + + save_debug(dbg->dbg_bcr, dbgbcr, brps); + save_debug(dbg->dbg_bvr, dbgbvr, brps); + save_debug(dbg->dbg_wcr, dbgwcr, wrps); + save_debug(dbg->dbg_wvr, dbgwvr, wrps); + + ctxt_sys_reg(ctxt, MDCCINT_EL1) = read_sysreg(mdccint_el1); +} + +static void __debug_restore_state(struct kvm_guest_debug_arch *dbg, + struct kvm_cpu_context *ctxt) +{ + u64 aa64dfr0; + int brps, wrps; + + aa64dfr0 = read_sysreg(id_aa64dfr0_el1); + + brps = (aa64dfr0 >> 12) & 0xf; + wrps = (aa64dfr0 >> 20) & 0xf; + + restore_debug(dbg->dbg_bcr, dbgbcr, brps); + restore_debug(dbg->dbg_bvr, dbgbvr, brps); + restore_debug(dbg->dbg_wcr, dbgwcr, wrps); + restore_debug(dbg->dbg_wvr, dbgwvr, wrps); + + write_sysreg(ctxt_sys_reg(ctxt, MDCCINT_EL1), mdccint_el1); +} + +static inline void __debug_switch_to_guest_common(struct kvm_vcpu *vcpu) +{ + struct kvm_cpu_context *host_ctxt; + struct kvm_cpu_context *guest_ctxt; + struct kvm_guest_debug_arch *host_dbg; + struct kvm_guest_debug_arch *guest_dbg; + + if (!(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY)) + return; + + host_ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt; + guest_ctxt = &vcpu->arch.ctxt; + host_dbg = &vcpu->arch.host_debug_state.regs; + guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr); + + __debug_save_state(host_dbg, host_ctxt); + __debug_restore_state(guest_dbg, guest_ctxt); +} + +static inline void __debug_switch_to_host_common(struct kvm_vcpu *vcpu) +{ + struct kvm_cpu_context *host_ctxt; + struct kvm_cpu_context *guest_ctxt; + struct kvm_guest_debug_arch *host_dbg; + struct kvm_guest_debug_arch *guest_dbg; + + if (!(vcpu->arch.flags & KVM_ARM64_DEBUG_DIRTY)) + return; + + host_ctxt = &__hyp_this_cpu_ptr(kvm_host_data)->host_ctxt; + guest_ctxt = &vcpu->arch.ctxt; + host_dbg = &vcpu->arch.host_debug_state.regs; + guest_dbg = kern_hyp_va(vcpu->arch.debug_ptr); + + __debug_save_state(guest_dbg, guest_ctxt); + __debug_restore_state(host_dbg, host_ctxt); + + vcpu->arch.flags &= ~KVM_ARM64_DEBUG_DIRTY; +} + +#endif /* __ARM64_KVM_HYP_DEBUG_SR_H__ */ |