diff options
| author | Sean Christopherson <seanjc@google.com> | 2024-07-26 16:51:10 -0700 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2024-08-13 19:28:00 +0100 |
| commit | ae41d7dbaeb4f79134136cd65ad7015cf9ccf78a (patch) | |
| tree | 536a852ffd460c670911c9f83a412275e55d2bb7 | |
| parent | 38753cbc4dca431d4354319c7481f6bd1a212baf (diff) | |
KVM: arm64: Release pfn, i.e. put page, if copying MTE tags hits ZONE_DEVICE
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 <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/20240726235234.228822-2-seanjc@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>
| -rw-r--r-- | arch/arm64/kvm/guest.c | 1 |
1 files changed, 1 insertions, 0 deletions
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; } |