Re: [PATCH] x86: vdso: fix pvclock races with task migration
From: Paolo Bonzini
Date: Mon Apr 06 2015 - 18:05:09 EST
On 06/04/2015 22:07, Andy Lutomirski wrote:
> On 04/02/2015 11:59 AM, Andy Lutomirski wrote:
>> On Thu, Apr 2, 2015 at 11:44 AM, Radim KrÄmÃÅ <rkrcmar@xxxxxxxxxx> wrote:
>>> If we were migrated right after __getcpu, but before reading the
>>> migration_count, we wouldn't notice that we read TSC of a different
>>> VCPU, nor that KVM's bug made pvti invalid, as only migration_count
>>> on source VCPU is increased.
>>> Change vdso instead of updating migration_count on destination.
>> Looks good to me.
> Just to check: what tree is this intended to go through? I can take it,
> but not until the previous patch makes it into Linus' tree or -tip. Or
> I can take both patches.
I'll take it for 4.1.
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