KVM: arm64: Fix exclusive limit for IPA size

Commit 262b003d059c6671601a19057e9fe1a5e7f23722 upstream.

When registering a memslot, we check the size and location of that
memslot against the IPA size to ensure that we can provide guest
access to the whole of the memory.

Unfortunately, this check rejects memslot that end-up at the exact
limit of the addressing capability for a given IPA size. For example,
it refuses the creation of a 2GB memslot at 0x8000000 with a 32bit
IPA space.

Fix it by relaxing the check to accept a memslot reaching the
limit of the IPA space.

Fixes: c3058d5da222 ("arm/arm64: KVM: Ensure memslots are within KVM_PHYS_SIZE")
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org # 4.4, 4.9
Reviewed-by: Andrew Jones <drjones@redhat.com>
Link: https://lore.kernel.org/r/20210311100016.3830038-3-maz@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arm/kvm/mmu.c b/arch/arm/kvm/mmu.c
index edd392fdc14bb44a0afffa0cffadc7e06527af03..b44fdee5cd6b2f260a49d48710fd1d64fb5812bb 100644 (file)
--- a/arch/arm/kvm/mmu.c
+++ b/arch/arm/kvm/mmu.c
@@ -1789,7 +1789,7 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
         * Prevent userspace from creating a memory region outside of the IPA
         * space addressable by the KVM guest IPA space.
         */
-       if (memslot->base_gfn + memslot->npages >=
+       if (memslot->base_gfn + memslot->npages >
            (KVM_PHYS_SIZE >> PAGE_SHIFT))
                return -EFAULT;