kernel.git/arch/arm/kvm/hyp, branch linux-4.10.y

arm/arm64: KVM: Perform local TLB invalidation when multiplexing vcpus on a single CPU

2016-11-04T17:56:28Z

Architecturally, TLBs are private to the (physical) CPU they're associated with. But when multiple vcpus from the same VM are being multiplexed on the same CPU, the TLBs are not private to the vcpus (and are actually shared across the VMID). Let's consider the following scenario: - vcpu-0 maps PA to VA - vcpu-1 maps PA' to VA If run on the same physical CPU, vcpu-1 can hit TLB entries generated by vcpu-0 accesses, and access the wrong physical page. The solution to this is to keep a per-VM map of which vcpu ran last on each given physical CPU, and invalidate local TLBs when switching to a different vcpu from the same VM. Reviewed-by: Christoffer Dall Signed-off-by: Marc Zyngier

ARM: KVM: Support vgic-v3

2016-09-22T11:22:21Z

This patch allows to build and use vgic-v3 in 32-bit mode. Unfortunately, it can not be split in several steps without extra stubs to keep patches independent and bisectable. For instance, virt/kvm/arm/vgic/vgic-v3.c uses function from vgic-v3-sr.c, handling access to GICv3 cpu interface from the guest requires vgic_v3.vgic_sre to be already defined. It is how support has been done: * handle SGI requests from the guest * report configured SRE on access to GICv3 cpu interface from the guest * required vgic-v3 macros are provided via uapi.h * static keys are used to select GIC backend * to make vgic-v3 build KVM_ARM_VGIC_V3 guard is removed along with the static inlines Acked-by: Marc Zyngier Reviewed-by: Christoffer Dall Signed-off-by: Vladimir Murzin Signed-off-by: Christoffer Dall

arm: KVM: Handle async aborts delivered while at HYP

2016-09-08T10:53:00Z

Just like for arm64, we can handle asynchronous aborts being delivered at HYP while being caused by the guest. We use the exact same method to catch such an abort, and soldier on. Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall

arm: KVM: Preserve pending Virtual Abort in world switch

2016-09-08T10:53:00Z

The HCR.VA bit is used to signal an Abort to a guest, and has the peculiar feature of getting cleared when the guest has taken the abort (this is the only bit that behaves as such in this register). This means that if we signal such an abort, we must leave it in the guest context until it disappears from HCR, and at which point it must be cleared from the context. Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall

KVM: arm/arm64: Get rid of exported aliases to static functions

2016-09-08T10:53:00Z

When rewriting the assembly code to C code, it was useful to have exported aliases or static functions so that we could keep the existing common C code unmodified and at the same time rewrite arm64 from assembly to C code, and later do the arm part. Now when both are done, we really don't need this level of indirection anymore, and it's time to save a few lines and brain cells. Acked-by: Marc Zyngier Signed-off-by: Christoffer Dall

ARM: KVM: Use common version of timer-sr.c

2016-02-29T18:34:19Z

Using the common HYP timer code is a bit more tricky, since we use system register names. Nothing a set of macros cannot work around... Acked-by: Christoffer Dall Signed-off-by: Marc Zyngier

ARM: KVM: Use common version of vgic-v2-sr.c

2016-02-29T18:34:19Z

No need to keep our own private version, the common one is strictly identical. Acked-by: Christoffer Dall Signed-off-by: Marc Zyngier

ARM: KVM: Move kvm/hyp/hyp.h to include/asm/kvm_hyp.h

2016-02-29T18:34:18Z

In order to be able to use the code located in virt/kvm/arm/hyp, we need to make the global hyp.h file accessible from include/asm, similar to what we did for arm64. Acked-by: Christoffer Dall Signed-off-by: Marc Zyngier

ARM: KVM: Remove __weak attributes

2016-02-29T18:34:15Z

Now that the old code is long gone, we can remove all the weak attributes, as there is only one version of the code. Acked-by: Christoffer Dall Signed-off-by: Marc Zyngier

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