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| author | Christoffer Dall <christoffer.dall@arm.com> | 2019-12-12 20:50:55 +0100 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2020-05-22 21:19:29 +0100 |
| commit | 6a73af05d634d774f72ea41f9518c777743726bc (patch) | |
| tree | abf24a96fd7972425ca1db5a358f794bb348ea7e /arch/Kconfig | |
| parent | 1b0d263daed194db05df28a2a10e39fea767fcc1 (diff) | |
| download | linux-stable-6a73af05d634d774f72ea41f9518c777743726bc.tar.gz linux-stable-6a73af05d634d774f72ea41f9518c777743726bc.tar.bz2 linux-stable-6a73af05d634d774f72ea41f9518c777743726bc.zip | |
KVM: arm64: Only sign-extend MMIO up to register width
commit b6ae256afd32f96bec0117175b329d0dd617655e upstream.
On AArch64 you can do a sign-extended load to either a 32-bit or 64-bit
register, and we should only sign extend the register up to the width of
the register as specified in the operation (by using the 32-bit Wn or
64-bit Xn register specifier).
As it turns out, the architecture provides this decoding information in
the SF ("Sixty-Four" -- how cute...) bit.
Let's take advantage of this with the usual 32-bit/64-bit header file
dance and do the right thing on AArch64 hosts.
Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20191212195055.5541-1-christoffer.dall@arm.com
[bwh: Backported to 3.16:
- Use ESR_EL2_SF
- Adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'arch/Kconfig')
0 files changed, 0 insertions, 0 deletions