KVM: arm64: Allow patching EL2 vectors even with KASLR is not enabled

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Patching the EL2 exception vectors is integral to the Spectre-v2
workaround, where it can be necessary to execute CPU-specific sequences
to nobble the branch predictor before running the hypervisor text proper.

Remove the dependency on CONFIG_RANDOMIZE_BASE and allow the EL2 vectors
to be patched even when KASLR is not enabled.

Fixes: 7a132017e7a5 ("KVM: arm64: Replace CONFIG_KVM_INDIRECT_VECTORS with CONFIG_RANDOMIZE_BASE")
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/202009221053.Jv1XsQUZ%lkp@intel.com
Signed-off-by: Will Deacon <will@kernel.org>

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This commit is contained in:

Will Deacon 2020-09-28 11:45:24 +01:00

parent 31c84d6c9c

commit 9ef2b48be9

6 changed files with 36 additions and 58 deletions

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arch/arm64/include/asm/kvm_asm.h

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arch/arm64/include/asm/kvm_mmu.h

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arch/arm64/kernel/proton-pack.c

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arch/arm64/kvm/arm.c

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arch/arm64/kvm/hyp/Makefile

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arch/arm64/kvm/hyp/hyp-entry.S

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