diff options
| author | Gleb Natapov | 2010-04-15 20:03:50 +0200 |
|---|---|---|
| committer | Avi Kivity | 2010-05-17 11:17:55 +0200 |
| commit | acb5451789f21ad51215897bb8f9306a05e8acd4 (patch) | |
| tree | 7ab1d73a9b4fbbc82a5a2a98dda701a81c4eaf33 /arch/x86/kvm/vmx.c | |
| parent | KVM: MMU: remove unused parameter in mmu_parent_walk() (diff) | |
| download | kernel-qcow2-linux-acb5451789f21ad51215897bb8f9306a05e8acd4.tar.gz kernel-qcow2-linux-acb5451789f21ad51215897bb8f9306a05e8acd4.tar.xz kernel-qcow2-linux-acb5451789f21ad51215897bb8f9306a05e8acd4.zip | |
KVM: prevent spurious exit to userspace during task switch emulation.
If kvm_task_switch() fails code exits to userspace without specifying
exit reason, so the previous exit reason is reused by userspace. Fix
this by specifying exit reason correctly.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx.c')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 1b38d8a88cf7..6e5e75e0d7d3 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3316,9 +3316,13 @@ static int handle_task_switch(struct kvm_vcpu *vcpu) type != INTR_TYPE_NMI_INTR)) skip_emulated_instruction(vcpu); - if (!kvm_task_switch(vcpu, tss_selector, reason, has_error_code, - error_code)) + if (kvm_task_switch(vcpu, tss_selector, reason, + has_error_code, error_code) == EMULATE_FAIL) { + vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR; + vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION; + vcpu->run->internal.ndata = 0; return 0; + } /* clear all local breakpoint enable flags */ vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55); |