Commit a9d496d8 authored by David Edmondson's avatar David Edmondson Committed by Paolo Bonzini
Browse files

KVM: x86: Clarify the kvm_run.emulation_failure structure layout 



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: default avatarSean Christopherson <seanjc@google.com>
Signed-off-by: default avatarDavid Edmondson <david.edmondson@oracle.com>
Reviewed-by: default avatarSean Christopherson <seanjc@google.com>
Message-Id: <20210920103737.2696756-2-david.edmondson@oracle.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent ed290e1c

include/uapi/linux/kvm.h

+6 −2
Original line number Diff line number Diff line
@@ -403,8 +403,12 @@ struct kvm_run { 
			__u32 suberror;

			__u32 ndata;

			__u64 flags;

			union {

				struct {

					__u8  insn_size;

					__u8  insn_bytes[15];

				};

			};

		} emulation_failure;

		/* KVM_EXIT_OSI */

		struct {