linux-kernel - [PATCH] KVM: x86: Use this_cpu_ptr() instead of per_cpu_ptr(smp_processor

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Message-ID: <20240802201630.339306-1-seanjc@google.com>
Date: Fri,  2 Aug 2024 13:16:30 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Isaku Yamahata <isaku.yamahata@...el.com>, Chao Gao <chao.gao@...el.com>, 
	Yuan Yao <yuan.yao@...el.com>
Subject: [PATCH] KVM: x86: Use this_cpu_ptr() instead of per_cpu_ptr(smp_processor_id())

From: Isaku Yamahata <isaku.yamahata@...el.com>

Use this_cpu_ptr() instead of open coding the equivalent in various
user return MSR helpers.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
Reviewed-by: Chao Gao <chao.gao@...el.com>
Reviewed-by: Yuan Yao <yuan.yao@...el.com>
[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---

Not entirely sure where this came from, found it in one of my myriad branches
while doing "spring" cleaning.

 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 af6c8cf6a37a..518baf47ef1c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -427,8 +427,7 @@ static void kvm_user_return_msr_cpu_online(void)
 
 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);
 	int err;
 
 	value = (value & mask) | (msrs->values[slot].host & ~mask);
@@ -450,8 +449,7 @@ 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);

base-commit: 332d2c1d713e232e163386c35a3ba0c1b90df83f
-- 
2.46.0.rc2.264.g509ed76dc8-goog