kernel/arch/arm/kvm/init.S, branch linux-4.15.y

arm: KVM: Allow unaligned accesses at HYP

2017-06-06T20:20:02Z

We currently have the HSCTLR.A bit set, trapping unaligned accesses at HYP, but we're not really prepared to deal with it. Since the rest of the kernel is pretty happy about that, let's follow its example and set HSCTLR.A to zero. Modern CPUs don't really care. Cc: stable@vger.kernel.org Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall

ARM: hyp-stub: Zero r0 on successful stub handling

2017-04-09T14:49:36Z

We now return HVC_STUB_ERR when a stub hypercall fails, but we leave whatever was in r0 on success. Zeroing it on return seems like a good idea. Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall

ARM: hyp-stub/KVM: Kill __hyp_get_vectors

2017-04-09T14:49:34Z

Nobody is using __hyp_get_vectors anymore, so let's remove both implementations (hyp-stub and KVM). Acked-by: Russell King Acked-by: Catalin Marinas Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall

ARM: KVM: Implement HVC_SOFT_RESTART in the init code

2017-04-09T14:49:30Z

Another missing stub hypercall is HVC_SOFT_RESTART. It turns out that it is pretty easy to implement in terms of HVC_RESET_VECTORS (since it needs to turn the MMU off). Tested-by: Keerthy Acked-by: Russell King Acked-by: Catalin Marinas Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall

ARM: KVM: Convert __cpu_reset_hyp_mode to using __hyp_reset_vectors

2017-04-09T14:49:30Z

We are now able to use the hyp stub to reset HYP mode. Time to kiss __kvm_hyp_reset goodbye, and use __hyp_reset_vectors. Tested-by: Keerthy Acked-by: Russell King Acked-by: Catalin Marinas Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall

ARM: KVM: Implement HVC_GET_VECTORS in the init code

2017-04-09T14:49:29Z

Now that we have an infrastructure to handle hypercalls in the KVM init code, let's implement HVC_GET_VECTORS there. Tested-by: Keerthy Acked-by: Russell King Acked-by: Catalin Marinas Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall

ARM: KVM: Implement HVC_RESET_VECTORS stub hypercall in the init code

2017-04-09T14:49:28Z

In order to restore HYP mode to its original condition, KVM currently implements __kvm_hyp_reset(). As we're moving towards a hyp-stub defined API, it becomes necessary to implement HVC_RESET_VECTORS. This patch adds the HVC_RESET_VECTORS hypercall to the KVM init code, which so far lacked any form of hypercall support. Tested-by: Keerthy Acked-by: Russell King Acked-by: Catalin Marinas Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall

arm: KVM: Allow hyp teardown

2016-07-03T21:41:27Z

So far, KVM was getting in the way of kexec on 32bit (and the arm64 kexec hackers couldn't be bothered to fix it on 32bit...). With simpler page tables, tearing KVM down becomes very easy, so let's just do it. Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall

arm: KVM: Simplify HYP init

2016-07-03T21:41:27Z

Just like for arm64, we can now make the HYP setup a lot simpler, and we can now initialise it in one go (instead of the two phases we currently have). Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall

ARM: KVM: Switch to C-based stage2 init

2016-02-29T18:34:14Z

As we now have hooks to setup VTCR from C code, let's drop the original VTCR setup and reimplement it as part of the HYP code. Reviewed-by: Christoffer Dall Signed-off-by: Marc Zyngier