linux-kernel - [PATCH 3/6] KVM: x86: Add emulator helper for LASS violation check

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Date:   Thu, 20 Apr 2023 21:37:21 +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,
        Gao Chao <chao.gao@...el.com>,
        Zeng Guang <guang.zeng@...el.com>
Subject: [PATCH 3/6] 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>
---
 arch/x86/kvm/kvm_emulate.h | 1 +
 arch/x86/kvm/x86.c         | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
index 2d9662be8333..1c55247d52d7 100644
--- a/arch/x86/kvm/kvm_emulate.h
+++ b/arch/x86/kvm/kvm_emulate.h
@@ -224,6 +224,7 @@ 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, u64 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 87feb1249ad6..704c5e4b9e76 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8193,6 +8193,14 @@ 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, u64 flags)
+{
+	struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
+
+	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,
@@ -8237,6 +8245,7 @@ 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