linux-kernel - Re: [PATCH v2 02/19] KVM: x86: Use this_cpu_ptr() instead of per_cpu_ptr(smp_processor

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Date:   Thu, 1 Sep 2022 13:56:26 +0800
From:   Chao Gao <chao.gao@...el.com>
To:     <isaku.yamahata@...el.com>
CC:     <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <isaku.yamahata@...il.com>, Paolo Bonzini <pbonzini@...hat.com>,
        "Sean Christopherson" <seanjc@...gle.com>,
        Kai Huang <kai.huang@...el.com>,
        "Will Deacon" <will@...nel.org>
Subject: Re: [PATCH v2 02/19] KVM: x86: Use this_cpu_ptr() instead of
 per_cpu_ptr(smp_processor_id())

On Tue, Aug 30, 2022 at 05:01:17AM -0700, isaku.yamahata@...el.com wrote:
>From: Isaku Yamahata <isaku.yamahata@...el.com>
>
>convert per_cpu_ptr(smp_processor_id()) to this_cpu_ptr() as trivial
>cleanup.
>
>Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>

Reviewed-by: Chao Gao <chao.gao@...el.com>

>---
> arch/x86/kvm/x86.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
>diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
>index 16104a2f7d8e..7d5fff68befe 100644
>--- a/arch/x86/kvm/x86.c
>+++ b/arch/x86/kvm/x86.c
>@@ -416,8 +416,7 @@ EXPORT_SYMBOL_GPL(kvm_find_user_return_msr);
> 
> int kvm_set_user_return_msr(unsigned slot, u64 value, u64 mask)
> {
>-	unsigned int cpu = smp_processor_id();
>-	struct kvm_user_return_msrs *msrs = per_cpu_ptr(user_return_msrs, cpu);
>+	struct kvm_user_return_msrs *msrs = this_cpu_ptr(user_return_msrs);
> 	struct kvm_user_return_msr_values *values = &msrs->values[slot];
> 	int err;
> 
>@@ -449,8 +448,7 @@ EXPORT_SYMBOL_GPL(kvm_set_user_return_msr);
> 
> static void drop_user_return_notifiers(void)
> {
>-	unsigned int cpu = smp_processor_id();
>-	struct kvm_user_return_msrs *msrs = per_cpu_ptr(user_return_msrs, cpu);
>+	struct kvm_user_return_msrs *msrs = this_cpu_ptr(user_return_msrs);
> 
> 	if (msrs->registered)
> 		kvm_on_user_return(&msrs->urn);
>-- 
>2.25.1
>