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KVM: nVMX: Fix switching of debug state 

First of all, do not blindly overwrite GUEST_DR7 on L2 entry. The host
may have guest debugging enabled. Then properly reset DR7 and DEBUG_CTL
on L2->L1 switch as specified in the SDM.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2013-03-03 13:05:44 +01:00 committed by Marcelo Tosatti
parent 16014753b1
commit 503cd0c50a
1 changed files with 4 additions and 1 deletions
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5
arch/x86/kvm/vmx.c
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@ -6978,7 +6978,7 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
vmcs12->guest_interruptibility_info);
vmcs_write32(GUEST_ACTIVITY_STATE, vmcs12->guest_activity_state);
vmcs_write32(GUEST_SYSENTER_CS, vmcs12->guest_sysenter_cs);
vmcs_writel(GUEST_DR7, vmcs12->guest_dr7);
kvm_set_dr(vcpu, 7, vmcs12->guest_dr7);
vmcs_writel(GUEST_RFLAGS, vmcs12->guest_rflags);
vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS,
vmcs12->guest_pending_dbg_exceptions);
@ -7492,6 +7492,9 @@ static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL)
vmcs_write64(GUEST_IA32_PERF_GLOBAL_CTRL,
vmcs12->host_ia32_perf_global_ctrl);
kvm_set_dr(vcpu, 7, 0x400);
vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
}
/*