From: David Ahern <dsahern@gmail.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: kvm@vger.kernel.org, avi@redhat.com, mtosatti@redhat.com,
linux-kernel@redhat.com, mingo@elte.hu, a.p.zijlstra@chello.nl,
acme@ghostprotocols.net, Frederic Weisbecker <fweisbec@gmail.com>
Subject: Re: [PATCH 6/9] perf: expose perf capability to other modules.
Date: Tue, 01 Nov 2011 10:20:04 -0600 [thread overview]
Message-ID: <4EB01C34.9060106@gmail.com> (raw)
In-Reply-To: <20111101161352.GA16539@redhat.com>
On 11/01/2011 10:13 AM, Gleb Natapov wrote:
> On Tue, Nov 01, 2011 at 09:49:19AM -0600, David Ahern wrote:
>> On 10/30/2011 10:53 AM, Gleb Natapov wrote:
>>> KVM needs to know perf capability to decide which PMU it can expose to a
>>> guest.
>>>
>>> Signed-off-by: Gleb Natapov <gleb@redhat.com>
>>> ---
>>> arch/x86/include/asm/perf_event.h | 11 +++++++++++
>>> arch/x86/kernel/cpu/perf_event.c | 11 +++++++++++
>>> arch/x86/kernel/cpu/perf_event.h | 2 ++
>>> arch/x86/kernel/cpu/perf_event_intel.c | 3 +++
>>> 4 files changed, 27 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
>>> index f61c62f..7d7e57f 100644
>>> --- a/arch/x86/include/asm/perf_event.h
>>> +++ b/arch/x86/include/asm/perf_event.h
>>> @@ -201,7 +201,18 @@ struct perf_guest_switch_msr {
>>> u64 host, guest;
>>> };
>>>
>>> +struct x86_pmu_capability {
>>> + int version;
>>> + int num_counters_gp;
>>> + int num_counters_fixed;
>>> + int bit_width_gp;
>>> + int bit_width_fixed;
>>> + unsigned int events_mask;
>>> + int events_mask_len;
>>> +};
>>> +
>>> extern struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr);
>>> +extern void perf_get_x86_pmu_capability(struct x86_pmu_capability *cap);
>>> #else
>>> static inline perf_guest_switch_msr *perf_guest_get_msrs(int *nr)
>>> {
>>
>> What about version of perf_get_x86_pmu_capability for CONFIG_PERF_EVENTS
>> not enabled in host kernel? Next patch for KVM assumes the function is
>> defined.
>>
> As far as I understand it is not possible to build x86 without
> CONFIG_PERF_EVENTS right now. Actually kvm pmu code depends on
> CONFIG_PERF_EVENTS been enabled. I can easily provide the stub if
> needed though.
Right. Originally it could be enabled/disabled. Right now it cannot be,
but I believe Frederic is working on making it configurable again.
David
next prev parent reply other threads:[~2011-11-01 16:20 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-30 16:53 [PATCH 0/9] KVM in-guest performance monitoring Gleb Natapov
2011-10-30 16:53 ` [PATCH 1/9] KVM: Expose kvm_lapic_local_deliver() Gleb Natapov
2011-10-30 16:53 ` [PATCH 2/9] KVM: Expose a version 2 architectural PMU to a guests Gleb Natapov
2011-11-01 10:47 ` Avi Kivity
2011-11-01 12:30 ` Gleb Natapov
2011-11-01 13:57 ` Gleb Natapov
2011-11-02 9:54 ` Avi Kivity
2011-11-02 9:56 ` Gleb Natapov
2011-11-02 10:01 ` Avi Kivity
2011-11-02 11:09 ` Gleb Natapov
2011-11-02 12:03 ` Gleb Natapov
2011-11-03 8:31 ` Gleb Natapov
2011-12-15 12:04 ` [PATCH] KVM: x86: Fix build breakage due to anonymous field initialization Jan Kiszka
2011-12-15 12:08 ` Peter Zijlstra
2011-12-15 12:16 ` Jan Kiszka
2011-12-26 12:38 ` Avi Kivity
2011-10-30 16:53 ` [PATCH 3/9] KVM: Add generic RDPMC support Gleb Natapov
2011-10-30 16:53 ` [PATCH 4/9] KVM: SVM: Intercept RDPMC Gleb Natapov
2011-10-30 16:53 ` [PATCH 5/9] KVM: VMX: " Gleb Natapov
2011-10-30 16:53 ` [PATCH 6/9] perf: expose perf capability to other modules Gleb Natapov
2011-11-01 10:49 ` Avi Kivity
2011-11-01 15:49 ` David Ahern
2011-11-01 16:13 ` Gleb Natapov
2011-11-01 16:20 ` David Ahern [this message]
2011-11-01 16:41 ` Gleb Natapov
2011-11-02 7:42 ` Frederic Weisbecker
2011-11-07 14:45 ` Will Deacon
2011-11-10 8:58 ` Frederic Weisbecker
2011-11-10 12:12 ` Jason Wessel
2011-11-15 18:34 ` Frederic Weisbecker
2011-10-30 16:53 ` [PATCH 7/9] KVM: Expose the architectural performance monitoring CPUID leaf Gleb Natapov
2011-11-01 10:51 ` Avi Kivity
2011-11-01 11:25 ` Gleb Natapov
2011-11-01 15:49 ` David Ahern
2011-11-01 16:18 ` Gleb Natapov
2011-11-01 16:24 ` David Ahern
2011-11-01 16:40 ` Gleb Natapov
2011-11-01 17:43 ` David Ahern
2011-11-02 11:18 ` Gleb Natapov
2011-10-30 16:53 ` [PATCH 8/9] KVM: x86 emulator: fix RDPMC privilege check Gleb Natapov
2011-10-30 16:53 ` [PATCH 9/9] KVM: x86 emulator: implement RDPMC (0F 33) Gleb Natapov
2011-10-30 16:57 ` [PATCH 0/9] KVM in-guest performance monitoring Gleb Natapov
-- strict thread matches above, loose matches on Subject: below --
2011-11-03 12:31 Gleb Natapov
2011-11-03 12:31 ` [PATCH 6/9] perf: expose perf capability to other modules Gleb Natapov
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