arm64: KVM: Add ARCH_WORKAROUND_2 support for guests

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In order to offer ARCH_WORKAROUND_2 support to guests, we need
a bit of infrastructure.

Let's add a flag indicating whether or not the guest uses
SSBD mitigation. Depending on the state of this flag, allow
KVM to disable ARCH_WORKAROUND_2 before entering the guest,
and enable it when exiting it.

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

...

This commit is contained in:

Marc Zyngier 2018-05-29 13:11:16 +01:00 • committed by Catalin Marinas

parent 85478bab40

commit 55e3748e89

6 changed files with 81 additions and 0 deletions

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5

arch/arm/include/asm/kvm_mmu.h

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arch/arm64/include/asm/kvm_asm.h

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arch/arm64/include/asm/kvm_host.h

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arch/arm64/include/asm/kvm_mmu.h

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arch/arm64/kvm/hyp/switch.c

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virt/kvm/arm/arm.c

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