linux-kernel - Re: [PATCH] KVM: selftests: Compare wall time from xen shinfo against KVM_GET

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Message-ID: <170666266419.3861766.8799090958259831473.b4-ty@google.com>
Date: Tue, 30 Jan 2024 16:59:29 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, kvm@...r.kernel.org, 
	Paolo Bonzini <pbonzini@...hat.com>, Vitaly Kuznetsov <vkuznets@...hat.com>
Cc: David Woodhouse <dwmw@...zon.co.uk>, Jan Richter <jarichte@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: selftests: Compare wall time from xen shinfo against KVM_GET_CLOCK

On Thu, 11 Jan 2024 14:59:01 +0100, Vitaly Kuznetsov wrote:
> xen_shinfo_test is observed to be flaky failing sporadically with
> "VM time too old". With min_ts/max_ts debug print added:
> 
> Wall clock (v 3269818) 1704906491.986255664
> Time info 1: v 1282712 tsc 33530585736 time 14014430025 mul 3587552223 shift 4294967295 flags 1
> Time info 2: v 1282712 tsc 33530585736 time 14014430025 mul 3587552223 shift 4294967295 flags 1
> min_ts: 1704906491.986312153
> max_ts: 1704906506.001006963
> ==== Test Assertion Failure ====
>   x86_64/xen_shinfo_test.c:1003: cmp_timespec(&min_ts, &vm_ts) <= 0
>   pid=32724 tid=32724 errno=4 - Interrupted system call
>      1	0x00000000004030ad: main at xen_shinfo_test.c:1003
>      2	0x00007fca6b23feaf: ?? ??:0
>      3	0x00007fca6b23ff5f: ?? ??:0
>      4	0x0000000000405e04: _start at ??:?
>   VM time too old
> 
> [...]

Applied to kvm-x86 selftests.  David, please holler if you disagree with
any of the changes.  They look sane to me, but clock stuff ain't my forte.

Thanks!

[1/1] KVM: selftests: Compare wall time from xen shinfo against KVM_GET_CLOCK
      https://github.com/kvm-x86/linux/commit/a0868e7c5575

--
https://github.com/kvm-x86/linux/tree/next