KVM: nSVM: Propagate SVM_EXIT_CR0_SEL_WRITE correctly for LMSW emulation

When emulating L2 instructions, svm_check_intercept() checks whether a
write to CR0 should trigger a synthesized #VMEXIT with
SVM_EXIT_CR0_SEL_WRITE. For MOV-to-CR0, SVM_EXIT_CR0_SEL_WRITE is only
triggered if any bit other than CR0.MP and CR0.TS is updated. However,
according to the APM (24593—Rev.  3.42—March 2024, Table 15-7):

  The LMSW instruction treats the selective CR0-write
  intercept as a non-selective intercept (i.e., it intercepts
  regardless of the value being written).

Skip checking the changed bits for x86_intercept_lmsw and always inject
SVM_EXIT_CR0_SEL_WRITE.

Fixes: cfec82c ("KVM: SVM: Add intercept check for emulated cr accesses")
Cc: stable@vger.kernel.org
Reported-by: Matteo Rizzo <matteorizzo@google.com>
Signed-off-by: Yosry Ahmed <yosry.ahmed@linux.dev>
Link: https://patch.msgid.link/20251024192918.3191141-3-yosry.ahmed@linux.dev
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: yosrym93

arch/x86/kvm/svm/svm.c

@@ -4546,20 +4546,20 @@ static int svm_check_intercept(struct kvm_vcpu *vcpu,
 					INTERCEPT_SELECTIVE_CR0)))
 			break;
 
-		cr0 = vcpu->arch.cr0 & ~SVM_CR0_SELECTIVE_MASK;
-		val = info->src_val  & ~SVM_CR0_SELECTIVE_MASK;
-
+		/* LMSW always triggers INTERCEPT_SELECTIVE_CR0 */
 		if (info->intercept == x86_intercept_lmsw) {
-			cr0 &= 0xfUL;
-			val &= 0xfUL;
-			/* lmsw can't clear PE - catch this here */
-			if (cr0 & X86_CR0_PE)
-				val |= X86_CR0_PE;
+			icpt_info.exit_code = SVM_EXIT_CR0_SEL_WRITE;
+			break;
 		}
 
+		/*
+		 * MOV-to-CR0 only triggers INTERCEPT_SELECTIVE_CR0 if any bit
+		 * other than SVM_CR0_SELECTIVE_MASK is changed.
+		 */
+		cr0 = vcpu->arch.cr0 & ~SVM_CR0_SELECTIVE_MASK;
+		val = info->src_val  & ~SVM_CR0_SELECTIVE_MASK;
 		if (cr0 ^ val)
 			icpt_info.exit_code = SVM_EXIT_CR0_SEL_WRITE;
-
 		break;
 	}
 	case SVM_EXIT_READ_DR0: