Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
KVM: arm64: Allow RES1 bits to be inferred from configuration
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>
+7
-2
+7
-2
arch/arm64/kvm/config.c
+7
-2
arch/arm64/kvm/config.c
···
24
24
#define CALL_FUNC BIT(1) /* Needs to evaluate tons of crap */
25
25
#define FIXED_VALUE BIT(2) /* RAZ/WI or RAO/WI in KVM */
26
26
#define MASKS_POINTER BIT(3) /* Pointer to fgt_masks struct instead of bits */
27
+
#define AS_RES1 BIT(4) /* RES1 when not supported */
27
28
28
29
unsigned long flags;
29
30
···
1316
1315
else
1317
1316
match = idreg_feat_match(kvm, &map[i]);
1318
1317
1319
-
if (!match || (map[i].flags & FIXED_VALUE))
1320
-
resx.res0 |= reg_feat_map_bits(&map[i]);
1318
+
if (!match || (map[i].flags & FIXED_VALUE)) {
1319
+
if (map[i].flags & AS_RES1)
1320
+
resx.res1 |= reg_feat_map_bits(&map[i]);
1321
+
else
1322
+
resx.res0 |= reg_feat_map_bits(&map[i]);
1323
+
}
1321
1324
}
1322
1325
1323
1326
return resx;