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When pKVM is enabled, host memory accesses are translated by an identity mapping at stage-2, which is populated lazily in response to synchronous exceptions from 64-bit EL1 and EL0. Extend this handling to cover exceptions originating from 32-bit EL0 as well. Although these are very unlikely to occur in practice, as the kernel typically ensures that user pages are initialised before mapping them in, drivers could still map previously untouched device pages into userspace and expect things to work rather than panic the system. Cc: Quentin Perret <qperret@google.com> Cc: Marc Zyngier <maz@kernel.org> Signed-off-by: Will Deacon <will@kernel.org> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20220427171332.13635-1-will@kernel.org |
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| .. | ||
| boot | ||
| configs | ||
| crypto | ||
| hyperv | ||
| include | ||
| kernel | ||
| kvm | ||
| lib | ||
| mm | ||
| net | ||
| tools | ||
| xen | ||
| Kbuild | ||
| Kconfig | ||
| Kconfig.debug | ||
| Kconfig.platforms | ||
| Makefile | ||