From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: Sean Christopherson <sean.j.christopherson@intel.com>,
Andy Lutomirski <luto@amacapital.net>
Cc: David Laight <David.Laight@aculab.com>,
Xiaoyao Li <xiaoyao.li@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Paolo Bonzini <pbonzini@redhat.com>,
"x86\@kernel.org" <x86@kernel.org>,
"linux-kernel\@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kvm\@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: [PATCH 1/2] KVM: x86: Emulate split-lock access as a write
Date: Tue, 04 Feb 2020 15:47:15 +0100 [thread overview]
Message-ID: <87y2timmto.fsf@vitty.brq.redhat.com> (raw)
In-Reply-To: <20200131200134.GD18946@linux.intel.com>
Sean Christopherson <sean.j.christopherson@intel.com> writes:
> Exiting to host userspace with "emulation failed" is the other reasonable
> alternative, but that's basically the same as killing the guest. We're
> arguing that, in the extremely unlikely event that there is a workload out
> there that hits this, it's preferable to *maybe* corrupt guest memory and
> log the anomaly in the kernel log, as opposed to outright killing the guest
> with a generic "emulation failed".
>
FWIW, if I was to cast a vote I'd pick 'kill the guest' one way or
another. "Maybe corrupt guest memory" scares me much more and in many
cases host and guest are different responsibility domains (think
'cloud').
--
Vitaly
next prev parent reply other threads:[~2020-02-04 14:47 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-30 12:19 [PATCH 0/2] kvm: split_lock: Fix emulator and extend #AC handler Xiaoyao Li
2020-01-30 12:19 ` [PATCH 1/2] KVM: x86: Emulate split-lock access as a write Xiaoyao Li
2020-01-30 12:31 ` David Laight
2020-01-30 15:16 ` Andy Lutomirski
2020-01-31 20:01 ` Sean Christopherson
2020-02-04 14:47 ` Vitaly Kuznetsov [this message]
2020-02-10 21:59 ` Sean Christopherson
2020-01-30 12:19 ` [PATCH 2/2] KVM: VMX: Extend VMX's #AC handding Xiaoyao Li
2020-01-30 15:18 ` Andy Lutomirski
2020-01-30 16:29 ` Xiaoyao Li
2020-01-30 17:16 ` Andy Lutomirski
2020-01-31 7:22 ` Xiaoyao Li
2020-01-31 15:37 ` Andy Lutomirski
2020-01-31 17:47 ` Xiaoyao Li
2020-01-31 20:17 ` Sean Christopherson
2020-01-31 20:57 ` Andy Lutomirski
2020-01-31 21:04 ` Sean Christopherson
2020-01-31 21:33 ` Andy Lutomirski
2020-02-01 16:58 ` Xiaoyao Li
2020-02-01 17:56 ` Andy Lutomirski
2020-02-02 4:33 ` Xiaoyao Li
2020-02-03 18:49 ` Andy Lutomirski
2020-02-04 6:03 ` Sean Christopherson
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