linux-kernel - [PATCH v2 4/8] KVM: x86: Add X86EMUL_F_INVTLB and pass it in em

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Message-Id: <20230718131844.5706-5-guang.zeng@intel.com>
Date:   Tue, 18 Jul 2023 21:18:40 +0800
From:   Zeng Guang <guang.zeng@...el.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        H Peter Anvin <hpa@...or.com>, kvm@...r.kernel.org
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Binbin Wu <binbin.wu@...ux.intel.com>,
        Zeng Guang <guang.zeng@...el.com>
Subject: [PATCH v2 4/8] KVM: x86: Add X86EMUL_F_INVTLB and pass it in em_invlpg()

From: Binbin Wu <binbin.wu@...ux.intel.com>

Add an emulation flag X86EMUL_F_INVTLB, which is used to identify an
instruction that does TLB invalidation without true memory access.

Only invlpg & invlpga implemented in emulator belong to this kind.
invlpga doesn't need additional information for emulation. Just pass
the flag to em_invlpg().

Signed-off-by: Binbin Wu <binbin.wu@...ux.intel.com>
Signed-off-by: Zeng Guang <guang.zeng@...el.com>
---
 arch/x86/kvm/emulate.c     | 4 +++-
 arch/x86/kvm/kvm_emulate.h | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 8e706d19ae45..9b4b3ce6d52a 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3443,8 +3443,10 @@ static int em_invlpg(struct x86_emulate_ctxt *ctxt)
 {
 	int rc;
 	ulong linear;
+	unsigned max_size;
 
-	rc = linearize(ctxt, ctxt->src.addr.mem, 1, false, &linear);
+	rc = __linearize(ctxt, ctxt->src.addr.mem, &max_size, 1, ctxt->mode,
+		&linear, X86EMUL_F_INVTLB);
 	if (rc == X86EMUL_CONTINUE)
 		ctxt->ops->invlpg(ctxt, linear);
 	/* Disable writeback. */
diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
index c0e48f4fa7c4..c944055091e1 100644
--- a/arch/x86/kvm/kvm_emulate.h
+++ b/arch/x86/kvm/kvm_emulate.h
@@ -93,6 +93,7 @@ struct x86_instruction_info {
 #define X86EMUL_F_FETCH			BIT(1)
 #define X86EMUL_F_BRANCH		BIT(2)
 #define X86EMUL_F_IMPLICIT		BIT(3)
+#define X86EMUL_F_INVTLB		BIT(4)
 
 struct x86_emulate_ops {
 	void (*vm_bugged)(struct x86_emulate_ctxt *ctxt);
-- 
2.27.0