linux-kernel - Re: [PATCH] add missing guest clock update removed by e48672fa25e879f7ae21785c7efd187738139593

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 09 Mar 2011 16:29:45 -0500
From:	Zachary Amsden <zamsden@...hat.com>
To:	Nikola Ciprich <extmaillist@...uxbox.cz>
CC:	KVM list <kvm@...r.kernel.org>,
	Linux kernel list <linux-kernel@...r.kernel.org>,
	nikola.ciprich@...uxbox.cz, Avi Kivity <avi@...hat.com>,
	Glauber Costa <glommer@...hat.com>
Subject: Re: [PATCH] add missing guest clock update removed by	e48672fa25e879f7ae21785c7efd187738139593

On 03/09/2011 02:30 PM, Nikola Ciprich wrote:
>> Can you try moving the kvm_make_request() inside the if conditional and
>> see if it that also fixes it?
>>      
> yes, changing to:
> if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) {
> 	kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
> 	/* Make sure TSC doesn't go backwards */
> 	s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 :
>
> is also OK.
>
> what about changing:
> if (check_tsc_unstable()) {
> 	kvm_x86_ops->adjust_tsc_offset(vcpu, -tsc_delta);
> 	vcpu->arch.tsc_catchup = 1;
> 	kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
> }
>
> to:
>
> if (check_tsc_unstable()) {
> 	kvm_x86_ops->adjust_tsc_offset(vcpu, -tsc_delta);
> 	vcpu->arch.tsc_catchup = 1;
> }
> kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
>
> this fixes thinks for me as well..
> n.
> ?
>    

Can you send a patch which does that?  I think this is the correct fix.

Thanks,

Zach
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/