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KVM: arm64: Disallow copying MTE to guest memory while KVM is dirty logging

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Disallow copying MTE tags to guest memory while KVM is dirty logging, as
writing guest memory without marking the gfn as dirty in the memslot could
result in userspace failing to migrate the updated page.  Ideally (maybe?),
KVM would simply mark the gfn as dirty, but there is no vCPU to work with,
and presumably the only use case for copy MTE tags _to_ the guest is when
restoring state on the target.

Fixes: f0376edb1d ("KVM: arm64: Add ioctl to fetch/store tags in a guest")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20240726235234.228822-3-seanjc@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Sean Christopherson 2024-07-26 16:51:11 -07:00 committed by Marc Zyngier
parent ae41d7dbae
commit e0b7de4fd1
1 changed files with 5 additions and 0 deletions
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5
arch/arm64/kvm/guest.c
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@ -1045,6 +1045,11 @@ int kvm_vm_ioctl_mte_copy_tags(struct kvm *kvm,
mutex_lock(&kvm->slots_lock);
if (write && atomic_read(&kvm->nr_memslots_dirty_logging)) {
ret = -EBUSY;
goto out;
}
while (length > 0) {
kvm_pfn_t pfn = gfn_to_pfn_prot(kvm, gfn, write, NULL);
void *maddr;