arm64: KVM: force cache clean on page fault when caches are off

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In order for the guest with caches off to observe data written
contained in a given page, we need to make sure that page is
committed to memory, and not just hanging in the cache (as
guest accesses are completely bypassing the cache until it
decides to enable it).

For this purpose, hook into the coherent_icache_guest_page
function and flush the region if the guest SCTLR_EL1
register doesn't show the MMU  and caches as being enabled.
The function also get renamed to coherent_cache_guest_page.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>

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This commit is contained in:

Marc Zyngier 2014-01-14 19:13:10 +00:00

parent 1b385cbdd7

commit 2d58b733c8

3 changed files with 16 additions and 8 deletions

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4

arch/arm/include/asm/kvm_mmu.h

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4

arch/arm/kvm/mmu.c

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16

arch/arm64/include/asm/kvm_mmu.h

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