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KVM: arm64: Use debug_owner to track if debug regs need save/restore

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Use the debug owner to determine if the debug regs are in use instead of
keeping around the DEBUG_DIRTY flag. Debug registers are now
saved/restored after the first trap, regardless of whether it was a read
or a write. This also shifts the point at which KVM becomes lazy to
vcpu_put() rather than the next exception taken from the guest.

Tested-by: James Clark <james.clark@linaro.org>
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20241219224116.3941496-12-oliver.upton@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Oliver Upton 2024-12-19 14:41:08 -08:00 • committed by Marc Zyngier
commit beb470d96c
5 changed files with 7 additions and 55 deletions
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