From: Alexander Shishkin <alexander.shishkin@linux.intel.com>
To: "Kang, Luwei" <luwei.kang@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"mingo@redhat.com" <mingo@redhat.com>,
"hpa@zytor.com" <hpa@zytor.com>,
"x86@kernel.org" <x86@kernel.org>,
"pbonzini@redhat.com" <pbonzini@redhat.com>,
"rkrcmar@redhat.com" <rkrcmar@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"joro@8bytes.org" <joro@8bytes.org>,
"peterz@infradead.org" <peterz@infradead.org>,
"chao.p.peng@linux.intel.com" <chao.p.peng@linux.intel.com>
Subject: Re: [PATCH v7 05/13] perf/x86/intel/pt: Introduce a new function to get capability of Intel PT
Date: Thu, 3 May 2018 15:13:01 +0300 [thread overview]
Message-ID: <20180503121301.nlbm4cotbv26tc7l@um.fi.intel.com> (raw)
In-Reply-To: <82D7661F83C1A047AF7DC287873BF1E167F6DDCE@SHSMSX101.ccr.corp.intel.com>
On Thu, May 03, 2018 at 11:04:52AM +0000, Kang, Luwei wrote:
> > > New function __pt_cap_get() will be invoked in KVM to check if a
> > > specific capability is availiable in KVM guest.
> > > Another function pt_cap_get() can only check the hardware capabilities
> > > but this may different with KVM guest because some features may not be
> > > exposed to guest.
> >
> > Do we really need both in KVM?
>
> Yes, KVM need get host capability to estimate if can expose this feature
> to guest
Can you elaborate on this, what information do we need besides
MSR_IA32_VMX_MISC[14]?
Thanks,
--
Alex
next prev parent reply other threads:[~2018-05-03 12:13 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 [this message]
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
-- 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 05/13] perf/x86/intel/pt: Introduce a new function to get capability of Intel PT Luwei Kang
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