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KVM: arm64: Allow guests with >48-bit IPA size on FEAT_LPA2 systems

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With all the page-table infrastructure in place, we can finally increase
the maximum permisable IPA size to 52-bits on 4KB and 16KB page systems
that have FEAT_LPA2.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20231127111737.1897081-11-ryan.roberts@arm.com
This commit is contained in:
Ryan Roberts
2023-11-27 11:17:35 +00:00
committed by Marc Zyngier
parent 0abc1b11a0
commit d782ac5b2c
1 changed files with 4 additions and 5 deletions
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arch/arm64/kvm/reset.c
+4 -5
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@@ -280,12 +280,11 @@ int __init kvm_set_ipa_limit(void)
parange = cpuid_feature_extract_unsigned_field(mmfr0,
ID_AA64MMFR0_EL1_PARANGE_SHIFT);
/*
* IPA size beyond 48 bits could not be supported
* on either 4K or 16K page size. Hence let's cap
* it to 48 bits, in case it's reported as larger
* on the system.
* IPA size beyond 48 bits for 4K and 16K page size is only supported
* when LPA2 is available. So if we have LPA2, enable it, else cap to 48
* bits, in case it's reported as larger on the system.
*/
if (PAGE_SIZE != SZ_64K)
if (!kvm_lpa2_is_enabled() && PAGE_SIZE != SZ_64K)
parange = min(parange, (unsigned int)ID_AA64MMFR0_EL1_PARANGE_48);
/*