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Diffstat (limited to 'arch/x86/kvm/x86.c')
-rw-r--r--arch/x86/kvm/x86.c18
1 files changed, 10 insertions, 8 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index fc2974adf9b6..22dee7aa7813 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -42,6 +42,7 @@
#define CREATE_TRACE_POINTS
#include "trace.h"
+#include <asm/debugreg.h>
#include <asm/uaccess.h>
#include <asm/msr.h>
#include <asm/desc.h>
@@ -3643,14 +3644,15 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
trace_kvm_entry(vcpu->vcpu_id);
kvm_x86_ops->run(vcpu, kvm_run);
- if (unlikely(vcpu->arch.switch_db_regs || test_thread_flag(TIF_DEBUG))) {
- set_debugreg(current->thread.debugreg[0], 0);
- set_debugreg(current->thread.debugreg[1], 1);
- set_debugreg(current->thread.debugreg[2], 2);
- set_debugreg(current->thread.debugreg[3], 3);
- set_debugreg(current->thread.debugreg6, 6);
- set_debugreg(current->thread.debugreg7, 7);
- }
+ /*
+ * If the guest has used debug registers, at least dr7
+ * will be disabled while returning to the host.
+ * If we don't have active breakpoints in the host, we don't
+ * care about the messed up debug address registers. But if
+ * we have some of them active, restore the old state.
+ */
+ if (__get_cpu_var(dr7) & DR_GLOBAL_ENABLE_MASK)
+ hw_breakpoint_restore();
set_bit(KVM_REQ_KICK, &vcpu->requests);
local_irq_enable();
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