[PATCH v4 31/43] arm64: rme: Prevent Device mappings for Realms
From: Steven Price <steven.price@arm.com>
Date: 2024-08-21 15:40:59
Also in:
kvm, kvmarm, linux-coco, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
Physical device assignment is not yet supported by the RMM, so it doesn't make much sense to allow device mappings within the realm. Prevent them when the guest is a realm. Signed-off-by: Steven Price <steven.price@arm.com> --- arch/arm64/kvm/mmu.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
index dfc3dd628e43..2110dd4c18db 100644
--- a/arch/arm64/kvm/mmu.c
+++ b/arch/arm64/kvm/mmu.c@@ -1142,6 +1142,10 @@ int kvm_phys_addr_ioremap(struct kvm *kvm, phys_addr_t guest_ipa, if (is_protected_kvm_enabled()) return -EPERM; + /* We don't support mapping special pages into a Realm */ + if (kvm_is_realm(kvm)) + return -EINVAL; + size += offset_in_page(guest_ipa); guest_ipa &= PAGE_MASK;
--
2.34.1