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| author | Marc Zyngier <maz@kernel.org> | 2021-01-21 12:08:15 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-02-03 23:28:41 +0100 |
| commit | 256a0040c6c9f6d342044897e33f280426a4e315 (patch) | |
| tree | cc29c4959c073d5139e4d002be00a0c8a07be250 /Documentation | |
| parent | e895a39a2bcdbb1d602316f3fb416aa93818805a (diff) | |
| download | linux-stable-256a0040c6c9f6d342044897e33f280426a4e315.tar.gz linux-stable-256a0040c6c9f6d342044897e33f280426a4e315.tar.bz2 linux-stable-256a0040c6c9f6d342044897e33f280426a4e315.zip | |
KVM: Forbid the use of tagged userspace addresses for memslots
commit 139bc8a6146d92822c866cf2fd410159c56b3648 upstream.
The use of a tagged address could be pretty confusing for the
whole memslot infrastructure as well as the MMU notifiers.
Forbid it altogether, as it never quite worked the first place.
Cc: stable@vger.kernel.org
Reported-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/virt/kvm/api.rst | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst index e00a66d72372..de70ba5ff8d3 100644 --- a/Documentation/virt/kvm/api.rst +++ b/Documentation/virt/kvm/api.rst @@ -1264,6 +1264,9 @@ field userspace_addr, which must point at user addressable memory for the entire memory slot size. Any object may back this memory, including anonymous memory, ordinary files, and hugetlbfs. +On architectures that support a form of address tagging, userspace_addr must +be an untagged address. + It is recommended that the lower 21 bits of guest_phys_addr and userspace_addr be identical. This allows large pages in the guest to be backed by large pages in the host. |