KVM: x86: Redefine 'longmode' as a flag for KVM_EXIT_HYPERCALL

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The 'longmode' field is a bit annoying as it blows an entire __u32 to
represent a boolean value. Since other architectures are looking to add
support for KVM_EXIT_HYPERCALL, now is probably a good time to clean it
up.

Redefine the field (and the remaining padding) as a set of flags.
Preserve the existing ABI by using bit 0 to indicate if the guest was in
long mode and requiring that the remaining 31 bits must be zero.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230404154050.2270077-2-oliver.upton@linux.dev

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Oliver Upton 2023-04-04 15:40:38 +00:00 • committed by Marc Zyngier

parent e8d018dd02

commit e65733b5c5

5 changed files with 23 additions and 5 deletions

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include/uapi/linux/kvm.h

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