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Re: [Qemu-devel] [PATCH] kvmclock: Ensure time in migration never goes b
From: |
Marcelo Tosatti |
Subject: |
Re: [Qemu-devel] [PATCH] kvmclock: Ensure time in migration never goes backward |
Date: |
Mon, 5 May 2014 20:31:20 -0300 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, May 05, 2014 at 08:23:43PM -0300, Marcelo Tosatti wrote:
> Hi Alexander,
>
> On Mon, May 05, 2014 at 03:51:22PM +0200, Alexander Graf wrote:
> > When we migrate we ask the kernel about its current belief on what the guest
> > time would be.
>
> KVM_GET_CLOCK which returns the time in "struct kvm_clock_data".
>
> > However, I've seen cases where the kvmclock guest structure
> > indicates a time more recent than the kvm returned time.
This should not happen because the value returned by KVM_GET_CLOCK
(get_kernel_ns() + kvmclock_offset) should be relatively in sync
with what is seen in the guest via kvmclock read.
Re: [Qemu-devel] [PATCH] kvmclock: Ensure time in migration never goes backward, Marcelo Tosatti, 2014/05/05
Re: [Qemu-devel] [PATCH] kvmclock: Ensure time in migration never goes backward, Alexander Graf, 2014/05/06
Re: [Qemu-devel] [PATCH] kvmclock: Ensure time in migration never goes backward, Marcelo Tosatti, 2014/05/07