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KVM: arm64: nv: Allow coarse-grained trap combos to use complex traps

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KVM uses a sanity-check to avoid infinite recursion in trap combinations
that could potentially depend on itself. Narrow the scope of this sanity
check to the exact CGT IDs that correspond w/ trap combos, opening the
door to using 'complex' traps as part of a combination.

Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241025182354.3364124-7-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton 2024-10-25 18:23:41 +00:00
parent eb609638da
commit 18aeeeb57b
1 changed files with 2 additions and 1 deletions
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3
arch/arm64/kvm/emulate-nested.c
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@ -2021,7 +2021,8 @@ int __init populate_nv_trap_config(void)
cgids = coarse_control_combo[id - __MULTIPLE_CONTROL_BITS__];
for (int i = 0; cgids[i] != __RESERVED__; i++) {
if (cgids[i] >= __MULTIPLE_CONTROL_BITS__) {
if (cgids[i] >= __MULTIPLE_CONTROL_BITS__ &&
cgids[i] < __COMPLEX_CONDITIONS__) {
kvm_err("Recursive MCB %d/%d\n", id, cgids[i]);
ret = -EINVAL;
}