KVM: arm64: Manage software step state at load/put

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KVM takes over the guest's software step state machine if the VMM is
debugging the guest, but it does the save/restore fiddling for every
guest entry.

Note that the only constraint on host usage of software step is that the
guest's configuration remains visible to userspace via the ONE_REG
ioctls. So, we can cut down on the amount of fiddling by doing this at
load/put instead.

Tested-by: James Clark <james.clark@linaro.org>
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20241219224116.3941496-16-oliver.upton@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>

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This commit is contained in:

Marc Zyngier 2024-12-20 08:59:48 +00:00

parent 4ad3a0b87f

commit 2ca3f03bf5

5 changed files with 48 additions and 129 deletions

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24

arch/arm64/include/asm/kvm_host.h

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4

arch/arm64/kvm/arm.c

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145

arch/arm64/kvm/debug.c

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2

arch/arm64/kvm/guest.c

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2

arch/arm64/kvm/handle_exit.c

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