linux-kernel - [PATCH v3 3/3] KVM: x86: SGX must obey the KVM_INTERNAL_ERROR

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Date:   Thu, 29 Jul 2021 14:39:31 +0100
From:   David Edmondson <david.edmondson@...cle.com>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Joerg Roedel <joro@...tes.org>, Ingo Molnar <mingo@...hat.com>,
        Jim Mattson <jmattson@...gle.com>, kvm@...r.kernel.org,
        Borislav Petkov <bp@...en8.de>,
        David Matlack <dmatlack@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Wanpeng Li <wanpengli@...cent.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        David Edmondson <david.edmondson@...cle.com>
Subject: [PATCH v3 3/3] KVM: x86: SGX must obey the KVM_INTERNAL_ERROR_EMULATION protocol

When passing the failing address and size out to user space, SGX must
ensure not to trample on the earlier fields of the emulation_failure
sub-union of struct kvm_run.

Signed-off-by: David Edmondson <david.edmondson@...cle.com>
---
 arch/x86/kvm/vmx/sgx.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/vmx/sgx.c b/arch/x86/kvm/vmx/sgx.c
index 6693ebdc0770..63fb93163383 100644
--- a/arch/x86/kvm/vmx/sgx.c
+++ b/arch/x86/kvm/vmx/sgx.c
@@ -53,11 +53,9 @@ static int sgx_get_encls_gva(struct kvm_vcpu *vcpu, unsigned long offset,
 static void sgx_handle_emulation_failure(struct kvm_vcpu *vcpu, u64 addr,
 					 unsigned int size)
 {
-	vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
-	vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
-	vcpu->run->internal.ndata = 2;
-	vcpu->run->internal.data[0] = addr;
-	vcpu->run->internal.data[1] = size;
+	uint64_t data[2] = { addr, size };
+
+	kvm_prepare_emulation_failure_exit(vcpu, false, data, sizeof(data));
 }
 
 static int sgx_read_hva(struct kvm_vcpu *vcpu, unsigned long hva, void *data,
-- 
2.30.2