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Re: [Xen-devel] TSC trouble in hvm linux, after host S3

On 11/20/2013 12:51 PM, Jan Beulich wrote:
On 20.11.13 at 12:41, Tomasz Wroblewski <tomasz.wroblewski@xxxxxxxxxx> wrote:
I've since found out that VMCS seems to provide tsc offsetting capabilities;
adding something like

          for_each_vcpu ( d, v )
              if (v->vcpu_id == 0)
                  hvm_set_guest_tsc(v, 0);

inside hvm_s3_resume (xen/arch/x86/hvm/hvm.c) fixed this for me; any comment
on such a solution?

This sounds plausible, but I'd prefer it to be done alongside the other
state resetting done for S3 (which all happen in hvm_s3_suspend()).
Unless that doesn't work, of course.

All right, thanks! I'll try it out and post a patch, I think it should work. I've only reset the tsc on vcpu 0 since I've noticed same is done in hvm_vcpu_initialize(), is that enough?


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