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KVM: x86: Clarify the kvm_run.emulation_failure structure layout

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Until more flags for kvm_run.emulation_failure flags are defined, it
is undetermined whether new payload elements corresponding to those
flags will be additive or alternative. As a hint to userspace that an
alternative is possible, wrap the current payload elements in a union.

Suggested-by: Sean Christopherson <[email protected]>
Signed-off-by: David Edmondson <[email protected]>
Reviewed-by: Sean Christopherson <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
David Edmondson authored and Paolo Bonzini committed 2021-10-25 06:48:24 -04:00
1 parent ed290e1c20
commit a9d496d8e0
1 file changed
+6 -2
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include/uapi/linux/kvm.h
+6 -2
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@@ -403,8 +403,12 @@ struct kvm_run {
__u32 suberror;
__u32 ndata;
__u64 flags;
__u8 insn_size;
__u8 insn_bytes[15];
union {
struct {
__u8 insn_size;
__u8 insn_bytes[15];
};
};
} emulation_failure;
/* KVM_EXIT_OSI */
struct {