[PATCH v12 01/84] KVM: arm64: Release pfn, i.e. put page, if copying MTE tags hits ZONE_DEVICE

[Sean Christopherson]

Put the page reference acquired by gfn_to_pfn_prot() if
kvm_vm_ioctl_mte_copy_tags() runs into ZONE_DEVICE memory.  KVM's less-
than-stellar heuristics for dealing with pfn-mapped memory means that KVM
can get a page reference to ZONE_DEVICE memory.

Fixes: f0376edb1ddc ("KVM: arm64: Add ioctl to fetch/store tags in a guest")
Signed-off-by: Sean Christopherson <sea...@google.com>
---
 arch/arm64/kvm/guest.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 11098eb7eb44..e1f0ff08836a 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -1059,6 +1059,7 @@ int kvm_vm_ioctl_mte_copy_tags(struct kvm *kvm,
                page = pfn_to_online_page(pfn);
                if (!page) {
                        /* Reject ZONE_DEVICE memory */
+                       kvm_release_pfn_clean(pfn);
                        ret = -EFAULT;
                        goto out;
                }
-- 
2.46.0.rc1.232.g9752f9e123-goog