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From: Paolo Bonzini <pbonzini@redhat.com>
To: Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Luwei Kang <luwei.kang@intel.com>
Cc: kvm@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com,
	hpa@zytor.com, x86@kernel.org, rkrcmar@redhat.com,
	linux-kernel@vger.kernel.org, joro@8bytes.org,
	peterz@infradead.org, chao.p.peng@linux.intel.com
Subject: Re: [PATCH v7 13/13] KVM: x86: Disable Intel Processor Trace when VMXON in L1 guest
Date: Fri, 4 May 2018 23:49:00 +0200	[thread overview]
Message-ID: <42da55ab-aefb-aa3c-bfed-d6f0457db798@redhat.com> (raw)
In-Reply-To: <20180504102358.eojiggqrnhxng2ru@um.fi.intel.com>

On 04/05/2018 12:23, Alexander Shishkin wrote:
>> Currently, Intel Processor Trace do not support tracing in L1 guest
>> VMX operation(IA32_VMX_MISC[bit 14] is 0). As mentioned in SDM,
> I don't understand this patch. You mention VMX_MISC[14] here, but I
> can't see anything related to it in the code.

This is talking about the _guest_'s view of IA32_VMX_MISC.  The code
does nothing to set it, so the patch does what the commit message says
below:

>> on these type of processors, execution of the VMXON instruction will
>> clears IA32_RTIT_CTL.TraceEn and any attempt to write IA32_RTIT_CTL
>> causes a general-protection exception (#GP).
>>
>> Signed-off-by: Luwei Kang <luwei.kang@intel.com>

Thanks,

Paolo

  reply	other threads:[~2018-05-04 21:49 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-03 12:08 [PATCH v7 00/13] Intel Processor Trace virtualization enabling Luwei Kang
2018-05-03 10:33 ` Alexander Shishkin
2018-05-03 12:08 ` [PATCH v7 01/13] perf/x86/intel/pt: Move Intel-PT MSRs bit definitions to a public header Luwei Kang
2018-05-03 12:08 ` [PATCH v7 02/13] perf/x86/intel/pt: Change pt_cap_get() to a public function Luwei Kang
2018-05-03 12:08 ` [PATCH v7 03/13] perf/x86/intel/pt: Add new bit definitions for Intel PT MSRs Luwei Kang
2018-05-03 12:08 ` [PATCH v7 04/13] perf/x86/intel/pt: add new capability for Intel PT Luwei Kang
2018-05-03 12:08 ` [PATCH v7 05/13] perf/x86/intel/pt: Introduce a new function to get capability of " Luwei Kang
2018-05-03 10:50   ` Alexander Shishkin
2018-05-03 11:04     ` Kang, Luwei
2018-05-03 12:13       ` Alexander Shishkin
2018-05-03 12:30         ` Paolo Bonzini
2018-05-03 12:30         ` Kang, Luwei
2018-05-03 12:32           ` Paolo Bonzini
2018-05-03 12:50             ` Kang, Luwei
2018-05-03 12:59               ` Alexander Shishkin
2018-05-03 12:08 ` [PATCH v7 06/13] KVM: x86: Add Intel Processor Trace virtualization mode Luwei Kang
2018-05-03 11:32   ` Alexander Shishkin
2018-05-03 11:50     ` Paolo Bonzini
2018-05-03 12:02       ` Alexander Shishkin
2018-05-03 12:30         ` Paolo Bonzini
2018-05-03 12:48           ` Alexander Shishkin
2018-05-03 12:50             ` Paolo Bonzini
2018-05-03 13:38               ` Alexander Shishkin
2018-05-03 13:48                 ` Paolo Bonzini
2018-05-04 10:38                   ` Alexander Shishkin
2018-05-04 21:52                     ` Paolo Bonzini
2018-05-04 10:45                 ` Peter Zijlstra
2018-05-04 21:44                   ` Paolo Bonzini
2018-05-04 22:15                     ` Peter Zijlstra
2018-05-07 10:47                       ` Paolo Bonzini
2018-05-03 11:52     ` Paolo Bonzini
2018-05-03 12:09       ` Alexander Shishkin
2018-05-03 12:31         ` Paolo Bonzini
2018-05-03 12:08 ` [PATCH v7 07/13] KVM: x86: Add Intel Processor Trace cpuid emulation Luwei Kang
2018-05-03 12:08 ` [PATCH v7 08/13] KVM: x86: Add Intel processor trace context for each vcpu Luwei Kang
2018-05-03 11:39   ` Alexander Shishkin
2018-05-03 11:53     ` Paolo Bonzini
2018-05-03 12:08 ` [PATCH v7 09/13] KVM: x86: Implement Intel Processor Trace context switch Luwei Kang
2018-05-04 10:29   ` Alexander Shishkin
2018-05-04 21:49     ` Paolo Bonzini
2018-05-03 12:08 ` [PATCH v7 10/13] KVM: x86: Introduce a function to initialize the PT configuration Luwei Kang
2018-05-03 12:08 ` [PATCH v7 11/13] KVM: x86: Implement Intel Processor Trace MSRs read/write Luwei Kang
2018-05-04 10:11   ` Alexander Shishkin
2018-05-04 21:47     ` Paolo Bonzini
2018-05-03 12:08 ` [PATCH v7 12/13] KVM: x86: Set intercept for Intel PT " Luwei Kang
2018-05-03 12:08 ` [PATCH v7 13/13] KVM: x86: Disable Intel Processor Trace when VMXON in L1 guest Luwei Kang
2018-05-04 10:23   ` Alexander Shishkin
2018-05-04 21:49     ` Paolo Bonzini [this message]
  -- strict thread matches above, loose matches on Subject: below --
2018-05-03 12:13 [PATCH v7 00/13] Intel Processor Trace virtualization enabling Luwei Kang
2018-05-03 12:13 ` [PATCH v7 13/13] KVM: x86: Disable Intel Processor Trace when VMXON in L1 guest Luwei Kang

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