linux-kernel - [PATCH v2 07/32] KVM: x86: Use non-atomic bit ops to manipulate "shadow" MSR intercepts

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Message-ID: <20250610225737.156318-8-seanjc@google.com>
Date: Tue, 10 Jun 2025 15:57:12 -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, 
	Chao Gao <chao.gao@...el.com>, Borislav Petkov <bp@...en8.de>, Xin Li <xin@...or.com>, 
	Dapeng Mi <dapeng1.mi@...ux.intel.com>, Francesco Lavra <francescolavra.fl@...il.com>, 
	Manali Shukla <Manali.Shukla@....com>
Subject: [PATCH v2 07/32] KVM: x86: Use non-atomic bit ops to manipulate
 "shadow" MSR intercepts

Manipulate the MSR bitmaps using non-atomic bit ops APIs (two underscores),
as the bitmaps are per-vCPU and are only ever accessed while vcpu->mutex is
held.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/svm/svm.c | 12 ++++++------
 arch/x86/kvm/vmx/vmx.c |  8 ++++----
 2 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 7e39b9df61f1..ec97ea1d7b38 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -789,14 +789,14 @@ static void set_shadow_msr_intercept(struct kvm_vcpu *vcpu, u32 msr, int read,
 
 	/* Set the shadow bitmaps to the desired intercept states */
 	if (read)
-		set_bit(slot, svm->shadow_msr_intercept.read);
+		__set_bit(slot, svm->shadow_msr_intercept.read);
 	else
-		clear_bit(slot, svm->shadow_msr_intercept.read);
+		__clear_bit(slot, svm->shadow_msr_intercept.read);
 
 	if (write)
-		set_bit(slot, svm->shadow_msr_intercept.write);
+		__set_bit(slot, svm->shadow_msr_intercept.write);
 	else
-		clear_bit(slot, svm->shadow_msr_intercept.write);
+		__clear_bit(slot, svm->shadow_msr_intercept.write);
 }
 
 static bool valid_msr_intercept(u32 index)
@@ -862,8 +862,8 @@ static void set_msr_interception_bitmap(struct kvm_vcpu *vcpu, u32 *msrpm,
 	bit_write = 2 * (msr & 0x0f) + 1;
 	tmp       = msrpm[offset];
 
-	read  ? clear_bit(bit_read,  &tmp) : set_bit(bit_read,  &tmp);
-	write ? clear_bit(bit_write, &tmp) : set_bit(bit_write, &tmp);
+	read  ? __clear_bit(bit_read,  &tmp) : __set_bit(bit_read,  &tmp);
+	write ? __clear_bit(bit_write, &tmp) : __set_bit(bit_write, &tmp);
 
 	msrpm[offset] = tmp;
 
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 9ff00ae9f05a..8f7fe04a1998 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -4029,9 +4029,9 @@ void vmx_disable_intercept_for_msr(struct kvm_vcpu *vcpu, u32 msr, int type)
 	idx = vmx_get_passthrough_msr_slot(msr);
 	if (idx >= 0) {
 		if (type & MSR_TYPE_R)
-			clear_bit(idx, vmx->shadow_msr_intercept.read);
+			__clear_bit(idx, vmx->shadow_msr_intercept.read);
 		if (type & MSR_TYPE_W)
-			clear_bit(idx, vmx->shadow_msr_intercept.write);
+			__clear_bit(idx, vmx->shadow_msr_intercept.write);
 	}
 
 	if ((type & MSR_TYPE_R) &&
@@ -4071,9 +4071,9 @@ void vmx_enable_intercept_for_msr(struct kvm_vcpu *vcpu, u32 msr, int type)
 	idx = vmx_get_passthrough_msr_slot(msr);
 	if (idx >= 0) {
 		if (type & MSR_TYPE_R)
-			set_bit(idx, vmx->shadow_msr_intercept.read);
+			__set_bit(idx, vmx->shadow_msr_intercept.read);
 		if (type & MSR_TYPE_W)
-			set_bit(idx, vmx->shadow_msr_intercept.write);
+			__set_bit(idx, vmx->shadow_msr_intercept.write);
 	}
 
 	if (type & MSR_TYPE_R)
-- 
2.50.0.rc0.642.g800a2b2222-goog