From: Marcelo Tosatti <mtosatti@redhat.com>
To: kvm <kvm@vger.kernel.org>
Cc: Amit Shah <amit.shah@redhat.com>, Eric B Munson <emunson@mgebm.net>
Subject: KVM: x86: fix pvclock guest stopped flag reporting
Date: Thu, 2 Aug 2012 12:33:43 -0300 [thread overview]
Message-ID: <20120802153343.GA12119@amt.cnet> (raw)
kvm_guest_time_update unconditionally clears hv_clock.flags field,
so the notification never reaches the guest.
Fix it by allowing PVCLOCK_GUEST_STOPPED to passthrough.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3a53bcc..e8ce10f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1217,7 +1217,9 @@ static int kvm_guest_time_update(struct kvm_vcpu *v)
vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset;
vcpu->last_kernel_ns = kernel_ns;
vcpu->last_guest_tsc = tsc_timestamp;
- vcpu->hv_clock.flags = 0;
+ /* only support PVCLOCK_GUEST_STOPPED flag ATM */
+ if (vcpu->hv_clock.flags != PVCLOCK_GUEST_STOPPED)
+ vcpu->hv_clock.flags = 0;
/*
* The interface expects us to write an even number signaling that the
next reply other threads:[~2012-08-02 15:34 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-02 15:33 Marcelo Tosatti [this message]
2012-08-02 15:42 ` KVM: x86: fix pvclock guest stopped flag reporting Avi Kivity
2012-08-02 15:43 ` Marcelo Tosatti
2012-08-02 15:52 ` Avi Kivity
2012-08-02 16:00 ` Marcelo Tosatti
2012-08-03 18:57 ` KVM: x86: fix pvclock guest stopped flag reporting (v2) Marcelo Tosatti
2012-08-07 12:16 ` Amit Shah
2012-08-07 13:18 ` Eric B Munson
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