Re: [Xen-devel] [PATCH] x86/hvm: fix saved pmtimer value

2015-09-09 Thread Wei Liu
On Wed, Sep 09, 2015 at 01:46:35AM -0600, Jan Beulich wrote: > >>> On 09.09.15 at 09:31, wrote: > > The ACPI PM timer is sometimes broken on live migration. > > Since vcpu->arch.hvm_vcpu.guest_time is zero in most cases. > > I.e. in other than "delay for missed ticks mode". Would have been > nice

Re: [Xen-devel] [PATCH] x86/hvm: fix saved pmtimer value

2015-09-09 Thread Jan Beulich
>>> On 09.09.15 at 10:31, wrote: > Jan Beulich writes: > > On 09.09.15 at 09:31, wrote: >>> The ACPI PM timer is sometimes broken on live migration. >>> Since vcpu->arch.hvm_vcpu.guest_time is zero in most cases. >> >> I.e. in other than "delay for missed ticks mode". Would have been >> nic

Re: [Xen-devel] [PATCH] x86/hvm: fix saved pmtimer value

2015-09-09 Thread Kouya Shimura
Jan Beulich writes: On 09.09.15 at 09:31, wrote: >> The ACPI PM timer is sometimes broken on live migration. >> Since vcpu->arch.hvm_vcpu.guest_time is zero in most cases. > > I.e. in other than "delay for missed ticks mode". Would have been > nice if you had spelled this out explicitly.

Re: [Xen-devel] [PATCH] x86/hvm: fix saved pmtimer value

2015-09-09 Thread Jan Beulich
>>> On 09.09.15 at 09:31, wrote: > The ACPI PM timer is sometimes broken on live migration. > Since vcpu->arch.hvm_vcpu.guest_time is zero in most cases. I.e. in other than "delay for missed ticks mode". Would have been nice if you had spelled this out explicitly. With that the question then is -

[Xen-devel] [PATCH] x86/hvm: fix saved pmtimer value

2015-09-09 Thread Kouya Shimura
The ACPI PM timer is sometimes broken on live migration. Since vcpu->arch.hvm_vcpu.guest_time is zero in most cases. Without this patch, the clock of windows server 2012R2 without HPET might leap forward several minutes on live migration. Signed-off-by: Kouya Shimura --- xen/arch/x86/hvm/pmtime