From: Paolo Bonzini <pbonzini@redhat.com>
To: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Luwei Kang <luwei.kang@intel.com>,
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 06/13] KVM: x86: Add Intel Processor Trace virtualization mode
Date: Thu, 3 May 2018 14:30:25 +0200 [thread overview]
Message-ID: <221c297b-1270-371b-70a3-4cff4bed7a7e@redhat.com> (raw)
In-Reply-To: <20180503120215.dev7ti43zk7yoovn@um.fi.intel.com>
On 03/05/2018 14:02, Alexander Shishkin wrote:
> I don't see why. System-wide tracing takes place while perf record is
> running. When it's done, it's done and we can un-disable the guest
> tracing, without requiring the user to kill all their VMs and reload
> modules.
Guest tracing can only be enabled at boot time, because the guest's
CPUID changes depending on whether it's enabled. And likewise if perf
record can do system-wide tracing at any time during the guest's
execution, we need to know it at boot time in order to set the guest CPUID.
Paolo
next prev parent reply other threads:[~2018-05-03 12:30 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 [this message]
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
2018-05-03 12:13 [PATCH v7 00/13] Intel Processor Trace virtualization enabling Luwei Kang
2018-05-03 12:13 ` [PATCH v7 06/13] KVM: x86: Add Intel Processor Trace virtualization mode Luwei Kang
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