Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
KVM: arm64: Simplify handling of HCR_EL2.E2H RESx
Now that we can link the RESx behaviour with the value of HCR_EL2.E2H,
we can trivially express the tautological constraint that makes E2H
a reserved value at all times.
Fun, isn't it?
Reviewed-by: Fuad Tabba <tabba@google.com>
Tested-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260202184329.2724080-15-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
+1
-11
+1
-11
arch/arm64/kvm/config.c
+1
-11
arch/arm64/kvm/config.c
···
388
388
return kvm_has_feat_enum(kvm, ID_AA64MMFR1_EL1, VMIDBits, 16);
389
389
}
390
390
391
-
static bool compute_hcr_e2h(struct kvm *kvm, struct resx *bits)
392
-
{
393
-
if (kvm_has_feat(kvm, FEAT_E2H0))
394
-
bits->res0 |= HCR_EL2_E2H;
395
-
else
396
-
bits->res1 |= HCR_EL2_E2H;
397
-
398
-
return true;
399
-
}
400
-
401
391
static const struct reg_bits_to_feat_map hfgrtr_feat_map[] = {
402
392
NEEDS_FEAT(HFGRTR_EL2_nAMAIR2_EL1 |
403
393
HFGRTR_EL2_nMAIR2_EL1,
···
1007
1017
NEEDS_FEAT(HCR_EL2_TWEDEL |
1008
1018
HCR_EL2_TWEDEn,
1009
1019
FEAT_TWED),
1010
-
NEEDS_FEAT_FIXED(HCR_EL2_E2H, compute_hcr_e2h),
1020
+
NEEDS_FEAT_FLAG(HCR_EL2_E2H, RES1_WHEN_E2H1 | FORCE_RESx),
1011
1021
FORCE_RES0(HCR_EL2_RES0),
1012
1022
FORCE_RES1(HCR_EL2_RES1),
1013
1023
};