tree 663351c1fc9303220d3fbb6b2a9e8fb073c00182
parent 7ce5168a68b155777348cd29d1f1a7d2e52980fb
author Marc Zyngier <marc.zyngier@arm.com> 1527595876 +0100
committer Marc Zyngier <marc.zyngier@arm.com> 1532079287 +0100

arm64: KVM: Add ARCH_WORKAROUND_2 support for guests

commit 55e3748e8902ff641e334226bdcb432f9a5d78d3 upstream.

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>