diff options
| author | Vladimir Murzin <vladimir.murzin@arm.com> | 2016-09-12 15:49:20 +0100 |
|---|---|---|
| committer | Christoffer Dall <christoffer.dall@linaro.org> | 2016-09-22 13:21:59 +0200 |
| commit | d7d0a11e44a1c6c1e61db7f305115f33be900704 (patch) | |
| tree | ff8b15fe984d8c3f95cc7fca916979d955d45cf9 | |
| parent | e533a37f7b5ee5eb8b102cf0823e84cd6a7deb57 (diff) | |
KVM: arm: vgic: Support 64-bit data manipulation on 32-bit host systems
We have couple of 64-bit registers defined in GICv3 architecture, so
unsigned long accesses to these registers will only access a single
32-bit part of that regitser. On the other hand these registers can't
be accessed as 64-bit with a single instruction like ldrd/strd or
ldmia/stmia if we run a 32-bit host because KVM does not support
access to MMIO space done by these instructions.
It means that a 32-bit guest accesses these registers in 32-bit
chunks, so the only thing we need to do is to ensure that
extract_bytes() always takes 64-bit data.
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>