linux-kernel - [PATCH v1 4/6] KVM: x86: Add emulator helper for LASS violation check

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Message-Id: <20230601142309.6307-5-guang.zeng@intel.com>
Date:   Thu,  1 Jun 2023 22:23:07 +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,
        Zeng Guang <guang.zeng@...el.com>
Subject: [PATCH v1 4/6] KVM: x86: Add emulator helper for LASS violation check

When LASS is enabled, KVM need apply LASS violation check to instruction
emulations. Add helper for the usage of x86 emulator to perform LASS
protection.

Signed-off-by: Zeng Guang <guang.zeng@...el.com>
Tested-by: Xuelian Guo <xuelian.guo@...el.com>
---
 arch/x86/kvm/kvm_emulate.h |  1 +
 arch/x86/kvm/x86.c         | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
index f1439ab7c14b..fd1c2b22867e 100644
--- a/arch/x86/kvm/kvm_emulate.h
+++ b/arch/x86/kvm/kvm_emulate.h
@@ -230,6 +230,7 @@ struct x86_emulate_ops {
 	int (*leave_smm)(struct x86_emulate_ctxt *ctxt);
 	void (*triple_fault)(struct x86_emulate_ctxt *ctxt);
 	int (*set_xcr)(struct x86_emulate_ctxt *ctxt, u32 index, u64 xcr);
+	bool (*check_lass)(struct x86_emulate_ctxt *ctxt, u64 access, u64 la, u32 flags);
 };
 
 /* Type, address-of, and value of an instruction's operand. */
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c0778ca39650..faf01fecc4ca 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8287,6 +8287,17 @@ static void emulator_vm_bugged(struct x86_emulate_ctxt *ctxt)
 		kvm_vm_bugged(kvm);
 }
 
+static bool emulator_check_lass(struct x86_emulate_ctxt *ctxt,
+				u64 access, u64 la, u32 flags)
+{
+	struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
+
+	if (!is_long_mode(vcpu))
+		return false;
+
+	return static_call(kvm_x86_check_lass)(vcpu, access, la, flags);
+}
+
 static const struct x86_emulate_ops emulate_ops = {
 	.vm_bugged           = emulator_vm_bugged,
 	.read_gpr            = emulator_read_gpr,
@@ -8332,6 +8343,7 @@ static const struct x86_emulate_ops emulate_ops = {
 	.leave_smm           = emulator_leave_smm,
 	.triple_fault        = emulator_triple_fault,
 	.set_xcr             = emulator_set_xcr,
+	.check_lass          = emulator_check_lass,
 };
 
 static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
-- 
2.27.0