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| author | Gleb Natapov <gleb@redhat.com> | 2013-05-08 18:38:44 +0300 |
|---|---|---|
| committer | Gleb Natapov <gleb@redhat.com> | 2013-05-09 09:04:56 +0300 |
| commit | 8d76c49e9ffeee839bc0b7a3278a23f99101263e (patch) | |
| tree | bc7fa578bfe3a9b5a9fbc2954fa2d8fab16072dc /arch/x86/kvm/vmx.c | |
| parent | 7dac16c379a876e256bc7349cd80007e7f9f2b59 (diff) | |
| download | linux-8d76c49e9ffeee839bc0b7a3278a23f99101263e.tar.bz2 | |
KVM: VMX: fix halt emulation while emulating invalid guest sate
The invalid guest state emulation loop does not check halt_request
which causes 100% cpu loop while guest is in halt and in invalid
state, but more serious issue is that this leaves halt_request set, so
random instruction emulated by vm86 #GP exit can be interpreted
as halt which causes guest hang. Fix both problems by handling
halt_request in emulation loop.
Reported-by: Tomas Papan <tomas.papan@gmail.com>
Tested-by: Tomas Papan <tomas.papan@gmail.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
CC: stable@vger.kernel.org
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Diffstat (limited to 'arch/x86/kvm/vmx.c')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 25a791ed21c8..260a91939555 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -5434,6 +5434,12 @@ static int handle_invalid_guest_state(struct kvm_vcpu *vcpu) return 0; } + if (vcpu->arch.halt_request) { + vcpu->arch.halt_request = 0; + ret = kvm_emulate_halt(vcpu); + goto out; + } + if (signal_pending(current)) goto out; if (need_resched()) |