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From: Chao Gao <chao.gao@intel.com>
To: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
	"Kirill A. Shutemov" <kas@kernel.org>, <kvm@vger.kernel.org>,
	<x86@kernel.org>, <linux-coco@lists.linux.dev>,
	<linux-kernel@vger.kernel.org>, Yan Zhao <yan.y.zhao@intel.com>,
	Xiaoyao Li <xiaoyao.li@intel.com>,
	Rick Edgecombe <rick.p.edgecombe@intel.com>,
	Hou Wenlong <houwenlong.hwl@antgroup.com>
Subject: Re: [PATCH v4 4/4] KVM: x86: Drop "cache" from user return MSR setter that skips WRMSR
Date: Fri, 17 Oct 2025 10:52:59 +0800	[thread overview]
Message-ID: <aPGvizIrwNX8aqr+@intel.com> (raw)
In-Reply-To: <20251016222816.141523-5-seanjc@google.com>

>+void __kvm_set_user_return_msr(unsigned int slot, u64 value)
>+{
>+	struct kvm_user_return_msrs *msrs = this_cpu_ptr(user_return_msrs);
>+
>+	msrs->values[slot].curr = value;
>+	kvm_user_return_register_notifier(msrs);
>+}
>+EXPORT_SYMBOL_GPL(__kvm_set_user_return_msr);

nit: s/EXPORT_SYMBOL_GPL/EXPORT_SYMBOL_FOR_KVM_INTERNAL

>+
> int kvm_set_user_return_msr(unsigned slot, u64 value, u64 mask)
> {
> 	struct kvm_user_return_msrs *msrs = this_cpu_ptr(user_return_msrs);
>@@ -667,21 +676,11 @@ int kvm_set_user_return_msr(unsigned slot, u64 value, u64 mask)
> 	if (err)
> 		return 1;
> 
>-	msrs->values[slot].curr = value;
>-	kvm_user_return_register_notifier(msrs);
>+	__kvm_set_user_return_msr(slot, value);
> 	return 0;
> }
> EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_set_user_return_msr);
> 
>-void kvm_user_return_msr_update_cache(unsigned int slot, u64 value)
>-{
>-	struct kvm_user_return_msrs *msrs = this_cpu_ptr(user_return_msrs);
>-
>-	msrs->values[slot].curr = value;
>-	kvm_user_return_register_notifier(msrs);
>-}
>-EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_user_return_msr_update_cache);
>-
> u64 kvm_get_user_return_msr(unsigned int slot)
> {
> 	return this_cpu_ptr(user_return_msrs)->values[slot].curr;
>-- 
>2.51.0.858.gf9c4a03a3a-goog
>
>

      reply	other threads:[~2025-10-17  2:53 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-10-16 22:28 [PATCH v4 0/4] KVM: x86: User-return MSR cleanups Sean Christopherson
2025-10-16 22:28 ` [PATCH v4 1/4] KVM: TDX: Synchronize user-return MSRs immediately after VP.ENTER Sean Christopherson
2025-10-20 22:55   ` Edgecombe, Rick P
2025-10-21 13:37     ` Adrian Hunter
2025-10-21 15:06       ` Sean Christopherson
2025-10-21 16:36         ` Adrian Hunter
2025-10-21 16:46           ` Sean Christopherson
2025-10-21 18:54         ` Edgecombe, Rick P
2025-10-21 19:33           ` Sean Christopherson
2025-10-21 20:49             ` Edgecombe, Rick P
2025-10-23  5:59             ` Xiaoyao Li
2025-10-16 22:28 ` [PATCH v4 2/4] KVM: x86: Leave user-return notifier registered on reboot/shutdown Sean Christopherson
2025-10-17  5:32   ` Chao Gao
2025-10-17 15:27     ` Sean Christopherson
2025-10-16 22:28 ` [PATCH v4 3/4] KVM: x86: Don't disable IRQs when unregistering user-return notifier Sean Christopherson
2025-10-16 22:28 ` [PATCH v4 4/4] KVM: x86: Drop "cache" from user return MSR setter that skips WRMSR Sean Christopherson
2025-10-17  2:52   ` Chao Gao [this message]

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