From: Uros Bizjak <ubizjak@gmail.com>
Date: Wed, 11 Feb 2026 10:28:50 +0000 (+0100)
Subject: KVM: VMX: Use ASM_INPUT_RM in __vmcs_writel
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=192f777b3af084d2073037b13ed0c2457e563d39;p=thirdparty%2Fkernel%2Flinux.git

KVM: VMX: Use ASM_INPUT_RM in __vmcs_writel

Use the ASM_INPUT_RM macro for VMCS write operation in vmx_ops.h to
work around clang problems with "rm" asm constraint. clang seems to
always chose the memory input, while it is almost always the worst
choice.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Thomas Gleixner <tglx@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Acked-by: Nathan Chancellor <nathan@kernel.org>
Link: https://patch.msgid.link/20260211102928.100944-2-ubizjak@gmail.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
---

diff --git a/arch/x86/kvm/vmx/vmx_ops.h b/arch/x86/kvm/vmx/vmx_ops.h
index 1000d37f5b0c2..81784befaaf49 100644
--- a/arch/x86/kvm/vmx/vmx_ops.h
+++ b/arch/x86/kvm/vmx/vmx_ops.h
@@ -221,7 +221,7 @@ fault:									\
 
 static __always_inline void __vmcs_writel(unsigned long field, unsigned long value)
 {
-	vmx_asm2(vmwrite, "r"(field), "rm"(value), field, value);
+	vmx_asm2(vmwrite, "r" (field), ASM_INPUT_RM (value), field, value);
 }
 
 static __always_inline void vmcs_write16(unsigned long field, u16 value)