From: Alexander Shishkin <alexander.shishkin@linux.intel.com>
To: Borislav Petkov <bp@alien8.de>, Peter Zijlstra <peterz@infradead.org>
Cc: Gleb Natapov <gleb@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
x86@kernel.org, kvm@vger.kernel.org,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org, tglx@linutronix.de, hpa@zytor.com,
Arnaldo Carvalho de Melo <acme@infradead.org>
Subject: Re: [PATCH] perf/x86/intel/pt: Don't die on VMXON
Date: Wed, 06 Apr 2016 15:07:48 +0300 [thread overview]
Message-ID: <874mbfym7f.fsf@ashishki-desk.ger.corp.intel.com> (raw)
In-Reply-To: <20160406115516.GE12070@pd.tnic>
Borislav Petkov <bp@alien8.de> writes:
> On Wed, Apr 06, 2016 at 01:52:15PM +0200, Peter Zijlstra wrote:
>> Borislav tells me this ought to be boot_cpu_has(X86_FEATURE_VMX)
>>
>> > + /* Intel SDM, 36.5 "Tracing post-VMXON" */
>> > + rdmsrl(MSR_IA32_VMX_MISC, reg);
>> > + if (reg & BIT(14))
>
> Also, I needz to consult my crystal ball about what bit 14 is...
>
> :-)
I know. It's right there in SDM chapter 36.5, referred to as "bit 14"
and it's not mentioned anywhere else that I could find, so I just left a
comment there.
Regards,
--
Alex
next prev parent reply other threads:[~2016-04-06 12:09 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-01 16:24 Alexander Shishkin
2016-04-06 8:52 ` Peter Zijlstra
2016-04-06 11:10 ` Alexander Shishkin
2016-04-06 11:52 ` Peter Zijlstra
2016-04-06 11:55 ` Borislav Petkov
2016-04-06 12:07 ` Alexander Shishkin [this message]
2016-04-06 14:06 ` Alexander Shishkin
2016-04-13 9:49 ` Ingo Molnar
2016-04-13 10:32 ` Alexander Shishkin
2016-04-13 10:53 ` Ingo Molnar
2016-04-13 13:48 ` Alexander Shishkin
2016-04-28 10:25 ` [tip:perf/core] " tip-bot for Alexander Shishkin
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