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| author | Marc Zyngier <maz@kernel.org> | 2024-10-23 16:53:14 +0200 |
|---|---|---|
| committer | Oliver Upton <oliver.upton@linux.dev> | 2024-10-31 03:42:29 +0100 |
| commit | 164b5e20cdf6038f1b38867d2f6252ec6f10c356 (patch) | |
| tree | 6894bd0f2d469d83a822f07475999655825d4663 /include/media/vsp1.h | |
| parent | KVM: arm64: nv: Add missing EL2->EL1 mappings in get_el2_to_el1_mapping() (diff) | |
| download | linux-164b5e20cdf6038f1b38867d2f6252ec6f10c356.tar.xz linux-164b5e20cdf6038f1b38867d2f6252ec6f10c356.zip | |
KVM: arm64: nv: Handle CNTHCTL_EL2 specially
Accessing CNTHCTL_EL2 is fraught with danger if running with
HCR_EL2.E2H=1: half of the bits are held in CNTKCTL_EL1, and
thus can be changed behind our back, while the rest lives
in the CNTHCTL_EL2 shadow copy that is memory-based.
Yes, this is a lot of fun!
Make sure that we merge the two on read access, while we can
write to CNTKCTL_EL1 in a more straightforward manner.
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20241023145345.1613824-7-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Diffstat (limited to 'include/media/vsp1.h')
0 files changed, 0 insertions, 0 deletions