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KVM: arm64: nv: Advertise the lack of AArch32 EL0 support

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Although we never supported 32bit anywhere in NV, we fail to
advertise so for EL0, probably owing to the relative lack of
hardware supporting both NV2 and 32bit EL0.

Add some sanitising to ID_AA64PFR0_EL1.EL0, and reaffirm that
"in 64bit-only we trust".

Reported-by: Oliver Upton <oliver.upton@linux.dev>
Acked-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier
2024-12-21 10:06:17 +00:00
parent 78d4f34e21
commit e891432cf7
1 changed files with 4 additions and 2 deletions
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6
arch/arm64/kvm/nested.c
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@@ -830,8 +830,10 @@ static void limit_nv_id_regs(struct kvm *kvm)
NV_FTR(PFR0, RAS) |
NV_FTR(PFR0, EL3) |
NV_FTR(PFR0, EL2) |
NV_FTR(PFR0, EL1));
/* 64bit EL1/EL2/EL3 only */
NV_FTR(PFR0, EL1) |
NV_FTR(PFR0, EL0));
/* 64bit only at any EL */
val |= FIELD_PREP(NV_FTR(PFR0, EL0), 0b0001);
val |= FIELD_PREP(NV_FTR(PFR0, EL1), 0b0001);
val |= FIELD_PREP(NV_FTR(PFR0, EL2), 0b0001);
val |= FIELD_PREP(NV_FTR(PFR0, EL3), 0b0001);