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Merge branch kvm-arm64/mmu/mte into kvmarm-master/next

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Last minute fix for MTE, making sure the pages are
flagged as MTE before they are released.

* kvm-arm64/mmu/mte:
  KVM: arm64: Set the MTE tag bit before releasing the page

Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2021-06-24 15:12:43 +01:00
commit 188982cda0
1 changed files with 8 additions and 4 deletions
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12
arch/arm64/kvm/guest.c
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@ -1053,6 +1053,14 @@ long kvm_vm_ioctl_mte_copy_tags(struct kvm *kvm,
} else {
num_tags = mte_copy_tags_from_user(maddr, tags,
MTE_GRANULES_PER_PAGE);
/*
* Set the flag after checking the write
* completed fully
*/
if (num_tags == MTE_GRANULES_PER_PAGE)
set_bit(PG_mte_tagged, &page->flags);
kvm_release_pfn_dirty(pfn);
}
@ -1061,10 +1069,6 @@ long kvm_vm_ioctl_mte_copy_tags(struct kvm *kvm,
goto out;
}
/* Set the flag after checking the write completed fully */
if (write)
set_bit(PG_mte_tagged, &page->flags);
gfn++;
tags += num_tags;
length -= PAGE_SIZE;