[Xen-changelog] [xen master] x86/hvm: reset TSC to 0 after domain resume from S3

[patchbot@xxxxxxx]

commit e95dc6ba69daef6468b3ae5912710727244d6e2f
Author:     Tomasz Wroblewski <tomasz.wroblewski@xxxxxxxxxx>
AuthorDate: Fri Nov 22 14:47:24 2013 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Nov 22 14:47:24 2013 +0100

    x86/hvm: reset TSC to 0 after domain resume from S3
    
    Host S3 implicitly resets the host TSC to 0, but the tsc offset for hvm
    domains is not recalculated when they resume, causing it to go into
    negative values. In Linux guest using tsc clocksource, this results in
    a hang after wrap back to positive values since the tsc clocksource
    implementation expects it reset.
    
    Signed-off-by: Tomasz Wroblewski <tomasz.wroblewski@xxxxxxxxxx>
---
 xen/arch/x86/hvm/hvm.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 3b353ec..b76f041 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -3737,7 +3737,13 @@ static void hvm_s3_suspend(struct domain *d)
 static void hvm_s3_resume(struct domain *d)
 {
     if ( test_and_clear_bool(d->arch.hvm_domain.is_s3_suspended) )
+    {
+        struct vcpu *v;
+
+        for_each_vcpu( d, v )
+            hvm_set_guest_tsc(v, 0);
         domain_unpause(d);
+    }
 }
 
 static int hvmop_set_isa_irq_level(
--
generated by git-patchbot for /home/xen/git/xen.git#master

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