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KVM: arm64: Allow RES1 bits to be inferred from configuration

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So far, when a bit field is tied to an unsupported feature, we set
it as RES0. This is almost correct, but there are a few exceptions
where the bits become RES1.

Add a AS_RES1 qualifier that instruct the RESx computing code to
simply do that.

Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-8-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2026-02-02 18:43:16 +00:00
parent bbea27636e
commit 459fc4e77e
1 changed files with 7 additions and 2 deletions
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9
arch/arm64/kvm/config.c
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@ -24,6 +24,7 @@ struct reg_bits_to_feat_map {
#define CALL_FUNC BIT(1) /* Needs to evaluate tons of crap */
#define FIXED_VALUE BIT(2) /* RAZ/WI or RAO/WI in KVM */
#define MASKS_POINTER BIT(3) /* Pointer to fgt_masks struct instead of bits */
#define AS_RES1 BIT(4) /* RES1 when not supported */
unsigned long flags;
@ -1315,8 +1316,12 @@ static struct resx __compute_fixed_bits(struct kvm *kvm,
else
match = idreg_feat_match(kvm, &map[i]);
if (!match || (map[i].flags & FIXED_VALUE))
resx.res0 |= reg_feat_map_bits(&map[i]);
if (!match || (map[i].flags & FIXED_VALUE)) {
if (map[i].flags & AS_RES1)
resx.res1 |= reg_feat_map_bits(&map[i]);
else
resx.res0 |= reg_feat_map_bits(&map[i]);
}
}
return resx;