linux-kernel - [tip: x86/core] KVM: x86: Introduce EM_ASM

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Message-ID: <175568275617.1420.14221081669385274315.tip-bot2@tip-bot2>
Date: Wed, 20 Aug 2025 09:39:16 -0000
From: "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>,
 Sean Christopherson <seanjc@...gle.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: x86/core] KVM: x86: Introduce EM_ASM_2CL

The following commit has been merged into the x86/core branch of tip:

Commit-ID:     67e944aff63cb6b9c236d9cc2b4d870aeefd306f
Gitweb:        https://git.kernel.org/tip/67e944aff63cb6b9c236d9cc2b4d870aeefd306f
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Sat, 26 Apr 2025 12:34:42 +02:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Mon, 18 Aug 2025 14:23:06 +02:00

KVM: x86: Introduce EM_ASM_2CL

Replace the FASTOP2CL instructions.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Sean Christopherson <seanjc@...gle.com>
Link: https://lkml.kernel.org/r/20250714103440.251039692@infradead.org
---
 arch/x86/kvm/emulate.c | 39 ++++++++++++++++++++++++---------------
 1 file changed, 24 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 05a97ec..9a78540 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -344,6 +344,15 @@ static int em_##op(struct x86_emulate_ctxt *ctxt) \
 	ON64(case 8: __EM_ASM_2(op##q, rax, rdx); break;) \
 	EM_ASM_END
 
+/* 2-operand, using "a" (dst) and CL (src2) */
+#define EM_ASM_2CL(op) \
+	EM_ASM_START(op) \
+	case 1: __EM_ASM_2(op##b, al, cl); break; \
+	case 2: __EM_ASM_2(op##w, ax, cl); break; \
+	case 4: __EM_ASM_2(op##l, eax, cl); break; \
+	ON64(case 8: __EM_ASM_2(op##q, rax, cl); break;) \
+	EM_ASM_END
+
 /*
  * fastop functions have a special calling convention:
  *
@@ -1080,13 +1089,13 @@ EM_ASM_1(neg);
 EM_ASM_1(inc);
 EM_ASM_1(dec);
 
-FASTOP2CL(rol);
-FASTOP2CL(ror);
-FASTOP2CL(rcl);
-FASTOP2CL(rcr);
-FASTOP2CL(shl);
-FASTOP2CL(shr);
-FASTOP2CL(sar);
+EM_ASM_2CL(rol);
+EM_ASM_2CL(ror);
+EM_ASM_2CL(rcl);
+EM_ASM_2CL(rcr);
+EM_ASM_2CL(shl);
+EM_ASM_2CL(shr);
+EM_ASM_2CL(sar);
 
 EM_ASM_2W(bsf);
 EM_ASM_2W(bsr);
@@ -4079,14 +4088,14 @@ static const struct opcode group1A[] = {
 };
 
 static const struct opcode group2[] = {
-	F(DstMem | ModRM, em_rol),
-	F(DstMem | ModRM, em_ror),
-	F(DstMem | ModRM, em_rcl),
-	F(DstMem | ModRM, em_rcr),
-	F(DstMem | ModRM, em_shl),
-	F(DstMem | ModRM, em_shr),
-	F(DstMem | ModRM, em_shl),
-	F(DstMem | ModRM, em_sar),
+	I(DstMem | ModRM, em_rol),
+	I(DstMem | ModRM, em_ror),
+	I(DstMem | ModRM, em_rcl),
+	I(DstMem | ModRM, em_rcr),
+	I(DstMem | ModRM, em_shl),
+	I(DstMem | ModRM, em_shr),
+	I(DstMem | ModRM, em_shl),
+	I(DstMem | ModRM, em_sar),
 };
 
 static const struct opcode group3[] = {