linux-kernel - Re: [PATCH RESEND v12 09/17] KVM: x86/pmu: Adjust precise_ip to emulate Ice Lake guest PDIR counter

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Date:   Fri, 13 May 2022 16:57:41 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Joerg Roedel <joro@...tes.org>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, Jim Mattson <jmattson@...gle.com>
Subject: Re: [PATCH RESEND v12 09/17] KVM: x86/pmu: Adjust precise_ip to
 emulate Ice Lake guest PDIR counter

On 11/4/2022 6:19 pm, Like Xu wrote:

> +++ b/arch/x86/kvm/pmu.h
> @@ -4,6 +4,8 @@
>   
>   #include <linux/nospec.h>
>   
> +#include <asm/cpu_device_id.h>
> +
>   #define vcpu_to_pmu(vcpu) (&(vcpu)->arch.pmu)
>   #define pmu_to_vcpu(pmu)  (container_of((pmu), struct kvm_vcpu, arch.pmu))
>   #define pmc_to_pmu(pmc)   (&(pmc)->vcpu->arch.pmu)
> @@ -15,6 +17,12 @@
>   #define VMWARE_BACKDOOR_PMC_REAL_TIME		0x10001
>   #define VMWARE_BACKDOOR_PMC_APPARENT_TIME	0x10002
>   
> +static const struct x86_cpu_id vmx_icl_pebs_cpu[] = {
> +	X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_D, NULL),
> +	X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_X, NULL),
> +	{}
> +};
The gcc [-Wunused-const-variable] flag would complain about
not moving vmx_icl_pebs_cpu[] from pmu.h to pmu.c:

diff --git a/arch/x86/kvm/pmu.c b/arch/x86/kvm/pmu.c
index b5d0c36b869b..17c9bfc2527d 100644
--- a/arch/x86/kvm/pmu.c
+++ b/arch/x86/kvm/pmu.c
@@ -27,6 +27,12 @@
  struct x86_pmu_capability __read_mostly kvm_pmu_cap;
  EXPORT_SYMBOL_GPL(kvm_pmu_cap);

+static const struct x86_cpu_id vmx_icl_pebs_cpu[] = {
+    X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_D, NULL),
+    X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_X, NULL),
+    {}
+};
+
  /* NOTE:
   * - Each perf counter is defined as "struct kvm_pmc";
   * - There are two types of perf counters: general purpose (gp) and fixed.
diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
index dbf4c83519a4..8064d074f3be 100644
--- a/arch/x86/kvm/pmu.h
+++ b/arch/x86/kvm/pmu.h
@@ -17,12 +17,6 @@
  #define VMWARE_BACKDOOR_PMC_REAL_TIME        0x10001
  #define VMWARE_BACKDOOR_PMC_APPARENT_TIME    0x10002

-static const struct x86_cpu_id vmx_icl_pebs_cpu[] = {
-    X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_D, NULL),
-    X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_X, NULL),
-    {}
-};
-
  struct kvm_event_hw_type_mapping {
      u8 eventsel;
      u8 unit_mask;