[RFC kvmtool 25/31] arm64: realm: Double the IPA space

Suzuki K Poulose
2023-01-27T11:43:53Z

The Realm's IPA space is divided into 2 halves. Protected
(lower half) and Unprotected (upper half). KVM implements
aliasing of the IPA, where the unprotected IPA is alias of
the corresponding protected ipa. Thus we must double the
IPA space required for a given VM.

Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
arm/aarch64/kvm.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/arm/aarch64/kvm.c b/arm/aarch64/kvm.c
index fca1410b..344c568b 100644
--- a/arm/aarch64/kvm.c
+++ b/arm/aarch64/kvm.c
@@ -189,6 +189,9 @@ int kvm__get_vm_type(struct kvm *kvm)
/* Otherwise, compute the minimal required IPA size */
max_ipa = kvm->cfg.ram_addr + kvm->cfg.ram_size - 1;
ipa_bits = max(32, fls_long(max_ipa));
+ /* Realm needs double the IPA space */
+ if (kvm->cfg.arch.is_realm)
+ ipa_bits++;
pr_debug("max_ipa %lx ipa_bits %d max_ipa_bits %d",
max_ipa, ipa_bits, max_ipa_bits);

--
2.34.1