diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/svm.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 86d802be602d..a449c3d76cba 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -34,6 +34,7 @@ #include <asm/perf_event.h> #include <asm/tlbflush.h> #include <asm/desc.h> +#include <asm/debugreg.h> #include <asm/kvm_para.h> #include <asm/virtext.h> @@ -1683,6 +1684,21 @@ static void svm_set_dr6(struct kvm_vcpu *vcpu, unsigned long value) mark_dirty(svm->vmcb, VMCB_DR); } +static void svm_sync_dirty_debug_regs(struct kvm_vcpu *vcpu) +{ + struct vcpu_svm *svm = to_svm(vcpu); + + get_debugreg(vcpu->arch.db[0], 0); + get_debugreg(vcpu->arch.db[1], 1); + get_debugreg(vcpu->arch.db[2], 2); + get_debugreg(vcpu->arch.db[3], 3); + vcpu->arch.dr6 = svm_get_dr6(vcpu); + vcpu->arch.dr7 = svm->vmcb->save.dr7; + + vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_WONT_EXIT; + set_dr_intercepts(svm); +} + static void svm_set_dr7(struct kvm_vcpu *vcpu, unsigned long value) { struct vcpu_svm *svm = to_svm(vcpu); @@ -2974,6 +2990,17 @@ static int dr_interception(struct vcpu_svm *svm) unsigned long val; int err; + if (svm->vcpu.guest_debug == 0) { + /* + * No more DR vmexits; force a reload of the debug registers + * and reenter on this instruction. The next vmexit will + * retrieve the full state of the debug registers. + */ + clr_dr_intercepts(svm); + svm->vcpu.arch.switch_db_regs |= KVM_DEBUGREG_WONT_EXIT; + return 1; + } + if (!boot_cpu_has(X86_FEATURE_DECODEASSISTS)) return emulate_on_interception(svm); @@ -4300,6 +4327,7 @@ static struct kvm_x86_ops svm_x86_ops = { .get_dr6 = svm_get_dr6, .set_dr6 = svm_set_dr6, .set_dr7 = svm_set_dr7, + .sync_dirty_debug_regs = svm_sync_dirty_debug_regs, .cache_reg = svm_cache_reg, .get_rflags = svm_get_rflags, .set_rflags = svm_set_rflags, |