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authorAndrey Smetanin <asmetanin@virtuozzo.com>2015-12-28 18:27:22 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2016-01-08 19:04:41 +0100
commit23a3b201fd187f1e7af573b3794c3c5ebf7d2c06 (patch)
tree8b8c0cabd788f2fa798e9994dd58f82b9dccca8c /arch/x86/kvm
parent0cdeabb1186fc3a6c7854f05cec7c99e32935ebc (diff)
downloadlinux-23a3b201fd187f1e7af573b3794c3c5ebf7d2c06.tar.bz2
kvm/x86: Hyper-V fix SynIC timer disabling condition
Hypervisor Function Specification(HFS) doesn't require to disable SynIC timer at timer config write if timer->count = 0. So drop this check, this allow to load timers MSR's during migration restore, because config are set before count in QEMU side. Also fix condition according to HFS doc(15.3.1): "It is not permitted to set the SINTx field to zero for an enabled timer. If attempted, the timer will be marked disabled (that is, bit 0 cleared) immediately." Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com> Reviewed-by: Roman Kagan <rkagan@virtuozzo.com> CC: Gleb Natapov <gleb@kernel.org> CC: Paolo Bonzini <pbonzini@redhat.com> CC: Roman Kagan <rkagan@virtuozzo.com> CC: Denis V. Lunev <den@openvz.org> CC: qemu-devel@nongnu.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
-rw-r--r--arch/x86/kvm/hyperv.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 5f85c12b223c..abfb9208ae53 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -474,7 +474,7 @@ static int stimer_start(struct kvm_vcpu_hv_stimer *stimer)
static int stimer_set_config(struct kvm_vcpu_hv_stimer *stimer, u64 config,
bool host)
{
- if (stimer->count == 0 || HV_STIMER_SINT(config) == 0)
+ if ((stimer->config & HV_STIMER_ENABLE) && HV_STIMER_SINT(config) == 0)
config &= ~HV_STIMER_ENABLE;
stimer->config = config;
stimer_cleanup(stimer);