linux-kernel - Re: [PATCH] KVM: Handle MSR_IA32_PERF

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Message-ID: <20160527153850.GC11721@potion>
Date:	Fri, 27 May 2016 17:38:50 +0200
From:	Radim Krčmář <rkrcmar@...hat.com>
To:	kmeaw@...dex-team.ru
Cc:	"Gabriel L. Somlo" <gsomlo@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"gleb@...nel.org" <gleb@...nel.org>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>
Subject: Re: [PATCH] KVM: Handle MSR_IA32_PERF_CTL

2016-05-27 17:22+0200, Radim Krčmář:
> (I wonder why MacOS X doesn't read IA32_PERF_STATUS, though.)

Oh, it maybe does ... we already emulate status and return 0x1000 in its
bottom 16 bits.  I have no idea what is that supposed to mean, but I
think we should return 0x1000 in IA32_PERF_CTL then.

(Would be nice to understand how that 0x1000 happened ... we might want
 0 in both.)