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| author | Jan Kiszka <jan.kiszka@siemens.com> | 2012-09-21 07:42:55 +0400 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-09-23 17:00:07 +0400 |
| commit | c863901075a42d50678616d8ee4b96ef13080498 (patch) | |
| tree | 947ffa1bd109f15b9cb483c8257fb028d0ed7df3 /arch/x86/kvm/svm.c | |
| parent | 7a84428af7ca6a847f058c9ff244a18a2664fd1b (diff) | |
| download | linux-c863901075a42d50678616d8ee4b96ef13080498.tar.xz | |
KVM: x86: Fix guest debug across vcpu INIT reset
If we reset a vcpu on INIT, we so far overwrote dr7 as provided by
KVM_SET_GUEST_DEBUG, and we also cleared switch_db_regs unconditionally.
Fix this by saving the dr7 used for guest debugging and calculating the
effective register value as well as switch_db_regs on any potential
change. This will change to focus of the set_guest_debug vendor op to
update_dp_bp_intercept.
Found while trying to stop on start_secondary.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm.c')
| -rw-r--r-- | arch/x86/kvm/svm.c | 23 |
1 files changed, 4 insertions, 19 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 818fceb3091e..d017df3899ef 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1146,7 +1146,6 @@ static void init_vmcb(struct vcpu_svm *svm) svm_set_efer(&svm->vcpu, 0); save->dr6 = 0xffff0ff0; - save->dr7 = 0x400; kvm_set_rflags(&svm->vcpu, 2); save->rip = 0x0000fff0; svm->vcpu.arch.regs[VCPU_REGS_RIP] = save->rip; @@ -1643,7 +1642,7 @@ static void svm_set_segment(struct kvm_vcpu *vcpu, mark_dirty(svm->vmcb, VMCB_SEG); } -static void update_db_intercept(struct kvm_vcpu *vcpu) +static void update_db_bp_intercept(struct kvm_vcpu *vcpu) { struct vcpu_svm *svm = to_svm(vcpu); @@ -1663,20 +1662,6 @@ static void update_db_intercept(struct kvm_vcpu *vcpu) vcpu->guest_debug = 0; } -static void svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg) -{ - struct vcpu_svm *svm = to_svm(vcpu); - - if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) - svm->vmcb->save.dr7 = dbg->arch.debugreg[7]; - else - svm->vmcb->save.dr7 = vcpu->arch.dr7; - - mark_dirty(svm->vmcb, VMCB_DR); - - update_db_intercept(vcpu); -} - static void new_asid(struct vcpu_svm *svm, struct svm_cpu_data *sd) { if (sd->next_asid > sd->max_asid) { @@ -1748,7 +1733,7 @@ static int db_interception(struct vcpu_svm *svm) if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP)) svm->vmcb->save.rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF); - update_db_intercept(&svm->vcpu); + update_db_bp_intercept(&svm->vcpu); } if (svm->vcpu.guest_debug & @@ -3659,7 +3644,7 @@ static void enable_nmi_window(struct kvm_vcpu *vcpu) */ svm->nmi_singlestep = true; svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF); - update_db_intercept(vcpu); + update_db_bp_intercept(vcpu); } static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr) @@ -4253,7 +4238,7 @@ static struct kvm_x86_ops svm_x86_ops = { .vcpu_load = svm_vcpu_load, .vcpu_put = svm_vcpu_put, - .set_guest_debug = svm_guest_debug, + .update_db_bp_intercept = update_db_bp_intercept, .get_msr = svm_get_msr, .set_msr = svm_set_msr, .get_segment_base = svm_get_segment_base, |