This is a note to let you know that I've just added the patch titled KVM: arm64: Fix exclusive limit for IPA size to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kvm-arm64-fix-exclusive-limit-for-ipa-size.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 262b003d059c6671601a19057e9fe1a5e7f23722 Mon Sep 17 00:00:00 2001 From: Marc Zyngier <maz@xxxxxxxxxx> Date: Thu, 11 Mar 2021 10:00:16 +0000 Subject: KVM: arm64: Fix exclusive limit for IPA size From: Marc Zyngier <maz@xxxxxxxxxx> 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@xxxxxxxxxx> Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Reviewed-by: Andrew Jones <drjones@xxxxxxxxxx> Link: https://lore.kernel.org/r/20210311100016.3830038-3-maz@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/arm64/kvm/mmu.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/arch/arm64/kvm/mmu.c +++ b/arch/arm64/kvm/mmu.c @@ -1309,8 +1309,7 @@ int kvm_arch_prepare_memory_region(struc * 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 >= - (kvm_phys_size(kvm) >> PAGE_SHIFT)) + if ((memslot->base_gfn + memslot->npages) > (kvm_phys_size(kvm) >> PAGE_SHIFT)) return -EFAULT; mmap_read_lock(current->mm); Patches currently in stable-queue which might be from maz@xxxxxxxxxx are queue-5.10/kvm-arm64-fix-range-alignment-when-walking-page-tables.patch queue-5.10/kvm-arm64-nvhe-save-the-spe-context-early.patch queue-5.10/kvm-arm64-reject-vm-creation-when-the-default-ipa-size-is-unsupported.patch queue-5.10/kvm-arm64-fix-exclusive-limit-for-ipa-size.patch queue-5.10/kvm-arm64-avoid-corrupting-vcpu-context-register-in-guest-exit.patch