From: "Zhang, Xiong Y" <xiong.y.zhang@linux.intel.com>
To: Sean Christopherson <seanjc@google.com>
Cc: pbonzini@redhat.com, peterz@infradead.org, mizhang@google.com,
kan.liang@intel.com, zhenyuw@linux.intel.com,
dapeng1.mi@linux.intel.com, jmattson@google.com,
kvm@vger.kernel.org, linux-perf-users@vger.kernel.org,
linux-kernel@vger.kernel.org, zhiyuan.lv@intel.com,
eranian@google.com, irogers@google.com, samantha.alt@intel.com,
like.xu.linux@gmail.com, chao.gao@intel.com,
Xiong Zhang <xiong.y.zhang@intel.com>
Subject: Re: [RFC PATCH 04/41] perf: core/x86: Add support to register a new vector for PMI handling
Date: Fri, 12 Apr 2024 11:56:39 +0800 [thread overview]
Message-ID: <3b4f03f8-146f-46ce-b729-046e9444d9e4@linux.intel.com> (raw)
In-Reply-To: <ZhgZdqAB6LlvJLof@google.com>
On 4/12/2024 1:10 AM, Sean Christopherson wrote:
> On Fri, Jan 26, 2024, Xiong Zhang wrote:
>> From: Xiong Zhang <xiong.y.zhang@intel.com>
>>
>> Create a new vector in the host IDT for PMI handling within a passthrough
>> vPMU implementation. In addition, add a function to allow the registration
>> of the handler and a function to switch the PMI handler.
>>
>> This is the preparation work to support KVM passthrough vPMU to handle its
>> own PMIs without interference from PMI handler of the host PMU.
>>
>> Signed-off-by: Xiong Zhang <xiong.y.zhang@intel.com>
>> Signed-off-by: Mingwei Zhang <mizhang@google.com>
>> ---
>> arch/x86/include/asm/hardirq.h | 1 +
>> arch/x86/include/asm/idtentry.h | 1 +
>> arch/x86/include/asm/irq.h | 1 +
>> arch/x86/include/asm/irq_vectors.h | 2 +-
>> arch/x86/kernel/idt.c | 1 +
>> arch/x86/kernel/irq.c | 29 ++++++++++++++++++++++++
>> tools/arch/x86/include/asm/irq_vectors.h | 1 +
>> 7 files changed, 35 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h
>> index 66837b8c67f1..c1e2c1a480bf 100644
>> --- a/arch/x86/include/asm/hardirq.h
>> +++ b/arch/x86/include/asm/hardirq.h
>> @@ -19,6 +19,7 @@ typedef struct {
>> unsigned int kvm_posted_intr_ipis;
>> unsigned int kvm_posted_intr_wakeup_ipis;
>> unsigned int kvm_posted_intr_nested_ipis;
>> + unsigned int kvm_vpmu_pmis;
>
> Somewhat off topic, does anyone actually ever use these particular stats? If the
> desire is to track _all_ IRQs, why not have an array and bump the counts in common
> code?
it is used in arch_show_interrupts() for /proc/interrupts.
>
>> #endif
>> unsigned int x86_platform_ipis; /* arch dependent */
>> unsigned int apic_perf_irqs;
>> diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
>> index 05fd175cec7d..d1b58366bc21 100644
>> --- a/arch/x86/include/asm/idtentry.h
>> +++ b/arch/x86/include/asm/idtentry.h
>> @@ -675,6 +675,7 @@ DECLARE_IDTENTRY_SYSVEC(IRQ_WORK_VECTOR, sysvec_irq_work);
>> DECLARE_IDTENTRY_SYSVEC(POSTED_INTR_VECTOR, sysvec_kvm_posted_intr_ipi);
>> DECLARE_IDTENTRY_SYSVEC(POSTED_INTR_WAKEUP_VECTOR, sysvec_kvm_posted_intr_wakeup_ipi);
>> DECLARE_IDTENTRY_SYSVEC(POSTED_INTR_NESTED_VECTOR, sysvec_kvm_posted_intr_nested_ipi);
>> +DECLARE_IDTENTRY_SYSVEC(KVM_VPMU_VECTOR, sysvec_kvm_vpmu_handler);
>
> I vote for KVM_VIRTUAL_PMI_VECTOR. I don't see any reasy to abbreviate "virtual",
> and the vector is a for a Performance Monitoring Interupt.
yes, KVM_GUEST_PMI_VECTOR in your next reply is better.
>
>> #endif
>>
>> #if IS_ENABLED(CONFIG_HYPERV)
>> diff --git a/arch/x86/include/asm/irq.h b/arch/x86/include/asm/irq.h
>> index 836c170d3087..ee268f42d04a 100644
>> --- a/arch/x86/include/asm/irq.h
>> +++ b/arch/x86/include/asm/irq.h
>> @@ -31,6 +31,7 @@ extern void fixup_irqs(void);
>>
>> #ifdef CONFIG_HAVE_KVM
>> extern void kvm_set_posted_intr_wakeup_handler(void (*handler)(void));
>> +extern void kvm_set_vpmu_handler(void (*handler)(void));
>
> virtual_pmi_handler()
>
>> #endif
>>
>> extern void (*x86_platform_ipi_callback)(void);
>> diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
>> index 3a19904c2db6..120403572307 100644
>> --- a/arch/x86/include/asm/irq_vectors.h
>> +++ b/arch/x86/include/asm/irq_vectors.h
>> @@ -77,7 +77,7 @@
>> */
>> #define IRQ_WORK_VECTOR 0xf6
>>
>> -/* 0xf5 - unused, was UV_BAU_MESSAGE */
>> +#define KVM_VPMU_VECTOR 0xf5
>
> This should be inside
>
> #ifdef CONFIG_HAVE_KVM
>
> no?
yes, it should have #if IS_ENABLED(CONFIG_KVM)
>
>> #define DEFERRED_ERROR_VECTOR 0xf4
>>
>> /* Vector on which hypervisor callbacks will be delivered */
>> diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
>> index 8857abc706e4..6944eec251f4 100644
>> --- a/arch/x86/kernel/idt.c
>> +++ b/arch/x86/kernel/idt.c
>> @@ -157,6 +157,7 @@ static const __initconst struct idt_data apic_idts[] = {
>> INTG(POSTED_INTR_VECTOR, asm_sysvec_kvm_posted_intr_ipi),
>> INTG(POSTED_INTR_WAKEUP_VECTOR, asm_sysvec_kvm_posted_intr_wakeup_ipi),
>> INTG(POSTED_INTR_NESTED_VECTOR, asm_sysvec_kvm_posted_intr_nested_ipi),
>> + INTG(KVM_VPMU_VECTOR, asm_sysvec_kvm_vpmu_handler),
>
> kvm_virtual_pmi_handler
>
>> @@ -332,6 +351,16 @@ DEFINE_IDTENTRY_SYSVEC_SIMPLE(sysvec_kvm_posted_intr_nested_ipi)
>> apic_eoi();
>> inc_irq_stat(kvm_posted_intr_nested_ipis);
>> }
>> +
>> +/*
>> + * Handler for KVM_PT_PMU_VECTOR.
>
> Heh, not sure where the PT part came from...
I will change it to KVM_GUEST_PMI_VECTOR
>
>> + */
>> +DEFINE_IDTENTRY_SYSVEC(sysvec_kvm_vpmu_handler)
>> +{
>> + apic_eoi();
>> + inc_irq_stat(kvm_vpmu_pmis);
>> + kvm_vpmu_handler();
>> +}
>> #endif
>>
>>
>> diff --git a/tools/arch/x86/include/asm/irq_vectors.h b/tools/arch/x86/include/asm/irq_vectors.h
>> index 3a19904c2db6..3773e60f1af8 100644
>> --- a/tools/arch/x86/include/asm/irq_vectors.h
>> +++ b/tools/arch/x86/include/asm/irq_vectors.h
>> @@ -85,6 +85,7 @@
>>
>> /* Vector for KVM to deliver posted interrupt IPI */
>> #ifdef CONFIG_HAVE_KVM
>> +#define KVM_VPMU_VECTOR 0xf5
>
> Heh, and your copy+paste is out of date.
Get it. 0xf5 isn't aligned with 0xf2, and the above comment should be moved prior POSTED_INTR_VECTOR
thanks
>
>> #define POSTED_INTR_VECTOR 0xf2
>> #define POSTED_INTR_WAKEUP_VECTOR 0xf1
>> #define POSTED_INTR_NESTED_VECTOR 0xf0
>> --
>> 2.34.1
>>
next prev parent reply other threads:[~2024-04-12 3:56 UTC|newest]
Thread overview: 181+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-26 8:54 [RFC PATCH 00/41] KVM: x86/pmu: Introduce passthrough vPM Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 01/41] perf: x86/intel: Support PERF_PMU_CAP_VPMU_PASSTHROUGH Xiong Zhang
2024-04-11 17:04 ` Sean Christopherson
2024-04-11 17:21 ` Liang, Kan
2024-04-11 17:24 ` Jim Mattson
2024-04-11 17:46 ` Sean Christopherson
2024-04-11 19:13 ` Liang, Kan
2024-04-11 20:43 ` Sean Christopherson
2024-04-11 21:04 ` Liang, Kan
2024-04-11 19:32 ` Sean Christopherson
2024-01-26 8:54 ` [RFC PATCH 02/41] perf: Support guest enter/exit interfaces Xiong Zhang
2024-03-20 16:40 ` Raghavendra Rao Ananta
2024-03-20 17:12 ` Liang, Kan
2024-04-11 18:06 ` Sean Christopherson
2024-04-11 19:53 ` Liang, Kan
2024-04-12 19:17 ` Sean Christopherson
2024-04-12 20:56 ` Liang, Kan
2024-04-15 16:03 ` Liang, Kan
2024-04-16 5:34 ` Zhang, Xiong Y
2024-04-16 12:48 ` Liang, Kan
2024-04-17 9:42 ` Zhang, Xiong Y
2024-04-18 16:11 ` Sean Christopherson
2024-04-19 1:37 ` Zhang, Xiong Y
2024-04-26 4:09 ` Zhang, Xiong Y
2024-01-26 8:54 ` [RFC PATCH 03/41] perf: Set exclude_guest onto nmi_watchdog Xiong Zhang
2024-04-11 18:56 ` Sean Christopherson
2024-01-26 8:54 ` [RFC PATCH 04/41] perf: core/x86: Add support to register a new vector for PMI handling Xiong Zhang
2024-04-11 17:10 ` Sean Christopherson
2024-04-11 19:05 ` Sean Christopherson
2024-04-12 3:56 ` Zhang, Xiong Y [this message]
2024-04-13 1:17 ` Mi, Dapeng
2024-01-26 8:54 ` [RFC PATCH 05/41] KVM: x86/pmu: Register PMI handler for passthrough PMU Xiong Zhang
2024-04-11 19:07 ` Sean Christopherson
2024-04-12 5:44 ` Zhang, Xiong Y
2024-01-26 8:54 ` [RFC PATCH 06/41] perf: x86: Add function to switch PMI handler Xiong Zhang
2024-04-11 19:17 ` Sean Christopherson
2024-04-11 19:34 ` Sean Christopherson
2024-04-12 6:03 ` Zhang, Xiong Y
2024-04-12 5:57 ` Zhang, Xiong Y
2024-01-26 8:54 ` [RFC PATCH 07/41] perf/x86: Add interface to reflect virtual LVTPC_MASK bit onto HW Xiong Zhang
2024-04-11 19:21 ` Sean Christopherson
2024-04-12 6:17 ` Zhang, Xiong Y
2024-01-26 8:54 ` [RFC PATCH 08/41] KVM: x86/pmu: Add get virtual LVTPC_MASK bit function Xiong Zhang
2024-04-11 19:22 ` Sean Christopherson
2024-01-26 8:54 ` [RFC PATCH 09/41] perf: core/x86: Forbid PMI handler when guest own PMU Xiong Zhang
2024-04-11 19:26 ` Sean Christopherson
2024-01-26 8:54 ` [RFC PATCH 10/41] perf: core/x86: Plumb passthrough PMU capability from x86_pmu to x86_pmu_cap Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 11/41] KVM: x86/pmu: Introduce enable_passthrough_pmu module parameter and propage to KVM instance Xiong Zhang
2024-04-11 20:54 ` Sean Christopherson
2024-04-11 21:03 ` Sean Christopherson
2024-01-26 8:54 ` [RFC PATCH 12/41] KVM: x86/pmu: Plumb through passthrough PMU to vcpu for Intel CPUs Xiong Zhang
2024-04-11 20:57 ` Sean Christopherson
2024-01-26 8:54 ` [RFC PATCH 13/41] KVM: x86/pmu: Add a helper to check if passthrough PMU is enabled Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 14/41] KVM: x86/pmu: Allow RDPMC pass through Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 15/41] KVM: x86/pmu: Manage MSR interception for IA32_PERF_GLOBAL_CTRL Xiong Zhang
2024-04-11 21:21 ` Sean Christopherson
2024-04-11 22:30 ` Jim Mattson
2024-04-11 23:27 ` Sean Christopherson
2024-04-13 2:10 ` Mi, Dapeng
2024-01-26 8:54 ` [RFC PATCH 16/41] KVM: x86/pmu: Create a function prototype to disable MSR interception Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 17/41] KVM: x86/pmu: Implement pmu function for Intel CPU " Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 18/41] KVM: x86/pmu: Intercept full-width GP counter MSRs by checking with perf capabilities Xiong Zhang
2024-04-11 21:23 ` Sean Christopherson
2024-04-11 21:50 ` Jim Mattson
2024-04-12 16:01 ` Sean Christopherson
2024-01-26 8:54 ` [RFC PATCH 19/41] KVM: x86/pmu: Whitelist PMU MSRs for passthrough PMU Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 20/41] KVM: x86/pmu: Introduce PMU operation prototypes for save/restore PMU context Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 21/41] KVM: x86/pmu: Introduce function prototype for Intel CPU to " Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 22/41] x86: Introduce MSR_CORE_PERF_GLOBAL_STATUS_SET for passthrough PMU Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 23/41] KVM: x86/pmu: Implement the save/restore of PMU state for Intel CPU Xiong Zhang
2024-04-11 21:26 ` Sean Christopherson
2024-04-13 2:29 ` Mi, Dapeng
2024-04-11 21:44 ` Sean Christopherson
2024-04-11 22:19 ` Jim Mattson
2024-04-11 23:31 ` Sean Christopherson
2024-04-13 3:19 ` Mi, Dapeng
2024-04-13 3:03 ` Mi, Dapeng
2024-04-13 3:34 ` Mingwei Zhang
2024-04-13 4:25 ` Mi, Dapeng
2024-04-15 6:06 ` Mingwei Zhang
2024-04-15 10:04 ` Mi, Dapeng
2024-04-15 16:44 ` Mingwei Zhang
2024-04-15 17:38 ` Sean Christopherson
2024-04-15 17:54 ` Mingwei Zhang
2024-04-15 22:45 ` Sean Christopherson
2024-04-22 2:14 ` maobibo
2024-04-22 17:01 ` Sean Christopherson
2024-04-23 1:01 ` maobibo
2024-04-23 2:44 ` Mi, Dapeng
2024-04-23 2:53 ` maobibo
2024-04-23 3:13 ` Mi, Dapeng
2024-04-23 3:26 ` maobibo
2024-04-23 3:59 ` Mi, Dapeng
2024-04-23 3:55 ` maobibo
2024-04-23 4:23 ` Mingwei Zhang
2024-04-23 6:08 ` maobibo
2024-04-23 6:45 ` Mi, Dapeng
2024-04-23 7:10 ` Mingwei Zhang
2024-04-23 8:24 ` Mi, Dapeng
2024-04-23 8:51 ` maobibo
2024-04-23 16:50 ` Mingwei Zhang
2024-04-23 12:12 ` maobibo
2024-04-23 17:02 ` Mingwei Zhang
2024-04-24 1:07 ` maobibo
2024-04-24 8:18 ` Mi, Dapeng
2024-04-24 15:00 ` Sean Christopherson
2024-04-25 3:55 ` Mi, Dapeng
2024-04-25 4:24 ` Mingwei Zhang
2024-04-25 16:13 ` Liang, Kan
2024-04-25 20:16 ` Mingwei Zhang
2024-04-25 20:43 ` Liang, Kan
2024-04-25 21:46 ` Sean Christopherson
2024-04-26 1:46 ` Mi, Dapeng
2024-04-26 3:12 ` Mingwei Zhang
2024-04-26 4:02 ` Mi, Dapeng
2024-04-26 4:46 ` Mingwei Zhang
2024-04-26 14:09 ` Liang, Kan
2024-04-26 18:41 ` Mingwei Zhang
2024-04-26 19:06 ` Liang, Kan
2024-04-26 19:46 ` Sean Christopherson
2024-04-27 3:04 ` Mingwei Zhang
2024-04-28 0:58 ` Mi, Dapeng
2024-04-28 6:01 ` Mingwei Zhang
2024-04-29 17:44 ` Sean Christopherson
2024-05-01 17:43 ` Mingwei Zhang
2024-05-01 18:00 ` Liang, Kan
2024-05-01 20:36 ` Sean Christopherson
2024-04-29 13:08 ` Liang, Kan
2024-04-26 13:53 ` Liang, Kan
2024-04-26 1:50 ` Mi, Dapeng
2024-04-18 21:21 ` Mingwei Zhang
2024-04-18 21:41 ` Mingwei Zhang
2024-04-19 1:02 ` Mi, Dapeng
2024-01-26 8:54 ` [RFC PATCH 24/41] KVM: x86/pmu: Zero out unexposed Counters/Selectors to avoid information leakage Xiong Zhang
2024-04-11 21:36 ` Sean Christopherson
2024-04-11 21:56 ` Jim Mattson
2024-01-26 8:54 ` [RFC PATCH 25/41] KVM: x86/pmu: Introduce macro PMU_CAP_PERF_METRICS Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 26/41] KVM: x86/pmu: Add host_perf_cap field in kvm_caps to record host PMU capability Xiong Zhang
2024-04-11 21:49 ` Sean Christopherson
2024-01-26 8:54 ` [RFC PATCH 27/41] KVM: x86/pmu: Clear PERF_METRICS MSR for guest Xiong Zhang
2024-04-11 21:50 ` Sean Christopherson
2024-04-13 3:29 ` Mi, Dapeng
2024-01-26 8:54 ` [RFC PATCH 28/41] KVM: x86/pmu: Switch IA32_PERF_GLOBAL_CTRL at VM boundary Xiong Zhang
2024-04-11 21:54 ` Sean Christopherson
2024-04-11 22:10 ` Jim Mattson
2024-04-11 22:54 ` Sean Christopherson
2024-04-11 23:08 ` Jim Mattson
2024-01-26 8:54 ` [RFC PATCH 29/41] KVM: x86/pmu: Exclude existing vLBR logic from the passthrough PMU Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 30/41] KVM: x86/pmu: Switch PMI handler at KVM context switch boundary Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 31/41] KVM: x86/pmu: Call perf_guest_enter() at PMU context switch Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 32/41] KVM: x86/pmu: Add support for PMU context switch at VM-exit/enter Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 33/41] KVM: x86/pmu: Make check_pmu_event_filter() an exported function Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 34/41] KVM: x86/pmu: Intercept EVENT_SELECT MSR Xiong Zhang
2024-04-11 21:55 ` Sean Christopherson
2024-01-26 8:54 ` [RFC PATCH 35/41] KVM: x86/pmu: Allow writing to event selector for GP counters if event is allowed Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 36/41] KVM: x86/pmu: Intercept FIXED_CTR_CTRL MSR Xiong Zhang
2024-04-11 21:56 ` Sean Christopherson
2024-01-26 8:54 ` [RFC PATCH 37/41] KVM: x86/pmu: Allow writing to fixed counter selector if counter is exposed Xiong Zhang
2024-04-11 22:03 ` Sean Christopherson
2024-04-13 4:12 ` Mi, Dapeng
2024-01-26 8:54 ` [RFC PATCH 38/41] KVM: x86/pmu: Introduce PMU helper to increment counter Xiong Zhang
2024-01-26 8:54 ` [RFC PATCH 39/41] KVM: x86/pmu: Implement emulated counter increment for passthrough PMU Xiong Zhang
2024-04-11 23:12 ` Sean Christopherson
2024-04-11 23:17 ` Sean Christopherson
2024-01-26 8:54 ` [RFC PATCH 40/41] KVM: x86/pmu: Separate passthrough PMU logic in set/get_msr() from non-passthrough vPMU Xiong Zhang
2024-04-11 23:18 ` Sean Christopherson
2024-04-18 21:54 ` Mingwei Zhang
2024-01-26 8:54 ` [RFC PATCH 41/41] KVM: nVMX: Add nested virtualization support for passthrough PMU Xiong Zhang
2024-04-11 23:21 ` Sean Christopherson
2024-04-11 17:03 ` [RFC PATCH 00/41] KVM: x86/pmu: Introduce passthrough vPM Sean Christopherson
2024-04-12 2:19 ` Zhang, Xiong Y
2024-04-12 18:32 ` Sean Christopherson
2024-04-15 1:06 ` Zhang, Xiong Y
2024-04-15 15:05 ` Sean Christopherson
2024-04-16 5:11 ` Zhang, Xiong Y
2024-04-18 20:46 ` Mingwei Zhang
2024-04-18 21:52 ` Mingwei Zhang
2024-04-19 19:14 ` Sean Christopherson
2024-04-19 22:02 ` Mingwei Zhang
2024-04-11 23:25 ` Sean Christopherson
2024-04-11 23:56 ` Mingwei Zhang
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