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KVM: arm64: Advertise FEAT_ECV when possible

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We can advertise support for FEAT_ECV if supported on the HW as
long as we limit it to the basic trap bits, and not advertise
CNTPOFF_EL2 support, even if the host has it (the short story
being that CNTPOFF_EL2 is not virtualisable).

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Link: https://lore.kernel.org/r/20250220134907.554085-13-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Marc Zyngier 2025-02-20 13:49:05 +00:00 committed by Oliver Upton
parent 642c23ea8b
commit 8b0b98ebf3
1 changed files with 5 additions and 3 deletions
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8
arch/arm64/kvm/nested.c
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@ -848,14 +848,16 @@ u64 limit_nv_id_reg(struct kvm *kvm, u32 reg, u64 val)
break;
case SYS_ID_AA64MMFR0_EL1:
/* Hide ECV, ExS, Secure Memory */
val &= ~(ID_AA64MMFR0_EL1_ECV |
ID_AA64MMFR0_EL1_EXS |
/* Hide ExS, Secure Memory */
val &= ~(ID_AA64MMFR0_EL1_EXS |
ID_AA64MMFR0_EL1_TGRAN4_2 |
ID_AA64MMFR0_EL1_TGRAN16_2 |
ID_AA64MMFR0_EL1_TGRAN64_2 |
ID_AA64MMFR0_EL1_SNSMEM);
/* Hide CNTPOFF if present */
val = ID_REG_LIMIT_FIELD_ENUM(val, ID_AA64MMFR0_EL1, ECV, IMP);
/* Disallow unsupported S2 page sizes */
switch (PAGE_SIZE) {
case SZ_64K: