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KVM: arm64: Refactor hvc filtering to support different actions

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KVM presently allows userspace to filter guest hypercalls with bitmaps
expressed via pseudo-firmware registers. These bitmaps have a narrow
scope and, of course, can only allow/deny a particular call. A
subsequent change to KVM will introduce a generalized UAPI for filtering
hypercalls, allowing functions to be forwarded to userspace.

Refactor the existing hypercall filtering logic to make room for more
than two actions. While at it, generalize the function names around
SMCCC as it is the basis for the upcoming UAPI.

No functional change intended.

Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230404154050.2270077-7-oliver.upton@linux.dev
This commit is contained in:
Oliver Upton
2023-04-04 15:40:43 +00:00
committed by Marc Zyngier
parent c2d2e9b3d8
commit a8308b3fc9
2 changed files with 31 additions and 4 deletions
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9
arch/arm64/include/uapi/asm/kvm.h
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@@ -469,6 +469,15 @@ enum {
/* run->fail_entry.hardware_entry_failure_reason codes. */
#define KVM_EXIT_FAIL_ENTRY_CPU_UNSUPPORTED (1ULL << 0)
enum kvm_smccc_filter_action {
KVM_SMCCC_FILTER_HANDLE = 0,
KVM_SMCCC_FILTER_DENY,
#ifdef __KERNEL__
NR_SMCCC_FILTER_ACTIONS
#endif
};
#endif
#endif /* __ARM_KVM_H__ */