linux-kernel - [PATCH] KVM: nVMX: properly pad struct kvm_vmx_nested_state

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Date:   Mon, 13 Jul 2020 10:28:24 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <sean.j.christopherson@...el.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] KVM: nVMX: properly pad struct kvm_vmx_nested_state_hdr

Holes in structs which are userspace ABI are undesireable.

Fixes: 83d31e5271ac ("KVM: nVMX: fixes for preemption timer migration")
Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 Documentation/virt/kvm/api.rst  | 2 +-
 arch/x86/include/uapi/asm/kvm.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
index 320788f81a05..7beccda11978 100644
--- a/Documentation/virt/kvm/api.rst
+++ b/Documentation/virt/kvm/api.rst
@@ -4345,7 +4345,7 @@ Errors:
 	struct {
 		__u16 flags;
 	} smm;
-
+	__u16 pad;
 	__u32 flags;
 	__u64 preemption_timer_deadline;
   };
diff --git a/arch/x86/include/uapi/asm/kvm.h b/arch/x86/include/uapi/asm/kvm.h
index 0780f97c1850..aae3df1cbd01 100644
--- a/arch/x86/include/uapi/asm/kvm.h
+++ b/arch/x86/include/uapi/asm/kvm.h
@@ -414,7 +414,7 @@ struct kvm_vmx_nested_state_hdr {
 	struct {
 		__u16 flags;
 	} smm;
-
+	__u16 pad;
 	__u32 flags;
 	__u64 preemption_timer_deadline;
 };
-- 
2.25.4