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| author | Jan Kiszka <jan.kiszka@siemens.com> | 2014-01-04 18:47:17 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-01-17 10:22:12 +0100 |
| commit | 8246bf52c75aa9b9b336a84f31ed2248754d0f71 (patch) | |
| tree | 099477dbaefe4a61c5c117097b54cf922acdd23d | |
| parent | 73aaf249ee2287b4686ff079dcbdbbb658156e64 (diff) | |
| download | linux-8246bf52c75aa9b9b336a84f31ed2248754d0f71.tar.bz2 | |
KVM: VMX: Fix DR6 update on #DB exception
According to the SDM, only bits 0-3 of DR6 "may" be cleared by "certain"
debug exception. So do update them on #DB exception in KVM, but leave
the rest alone, only setting BD and BS in addition to already set bits
in DR6. This also aligns us with kvm_vcpu_check_singlestep.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/vmx.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 79b360e4fed1..c8eb27ff1a2d 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -4869,7 +4869,8 @@ static int handle_exception(struct kvm_vcpu *vcpu) dr6 = vmcs_readl(EXIT_QUALIFICATION); if (!(vcpu->guest_debug & (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) { - vcpu->arch.dr6 = dr6 | DR6_FIXED_1; + vcpu->arch.dr6 &= ~15; + vcpu->arch.dr6 |= dr6; kvm_queue_exception(vcpu, DB_VECTOR); return 1; } |