arm64: KVM: Dynamically patch the kernel/hyp VA mask

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So far, we're using a complicated sequence of alternatives to
patch the kernel/hyp VA mask on non-VHE, and NOP out the
masking altogether when on VHE.

The newly introduced dynamic patching gives us the opportunity
to simplify that code by patching a single instruction with
the correct mask (instead of the mind bending cumulative masking
we have at the moment) or even a single NOP on VHE. This also
adds some initial code that will allow the patching callback
to switch to a more complex patching.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

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This commit is contained in:

Marc Zyngier 2017-12-03 17:36:55 +00:00

parent ef3935eeeb

commit 2b4d1606aa

3 changed files with 105 additions and 34 deletions

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46

arch/arm64/include/asm/kvm_mmu.h

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2

arch/arm64/kvm/Makefile

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91

arch/arm64/kvm/va_layout.c

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