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Message-ID: <20200204093725.GC14879@hirez.programming.kicks-ass.net>
Date: Tue, 4 Feb 2020 10:37:25 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Xiaoyao Li <xiaoyao.li@...el.com>
Cc: Sean Christopherson <sean.j.christopherson@...el.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Andy Lutomirski <luto@...capital.net>, x86@...nel.org,
kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
David Laight <David.Laight@...lab.com>
Subject: Re: [PATCH v2 5/6] kvm: x86: Emulate MSR IA32_CORE_CAPABILITIES
On Tue, Feb 04, 2020 at 05:19:26PM +0800, Xiaoyao Li wrote:
> > > + case MSR_IA32_CORE_CAPS:
> > > + if (!msr_info->host_initiated)
> >
> > Shouldn't @data be checked against kvm_get_core_capabilities()?
>
> Maybe it's for the case that userspace might have the ability to emulate SLD
> feature? And we usually let userspace set whatever it wants, e.g.,
> ARCH_CAPABILITIES.
If the 'sq_misc.split_lock' event is sufficiently accurate, I suppose
the host could use that to emulate the feature at the cost of one
counter used.
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