kernel.git/arch/arm64/include/asm/kvm_hyp.h, branch linux-4.9.y

arm64: KVM: Inject a vSerror if detecting a bad GICV access at EL2

2016-09-08T10:53:00Z

If, when proxying a GICV access at EL2, we detect that the guest is doing something silly, report an EL1 SError instead ofgnoring the access. Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall

arm64: KVM: vgic-v2: Add the GICV emulation infrastructure

2016-09-08T10:53:00Z

In order to efficiently perform the GICV access on behalf of the guest, we need to be able to avoid going back all the way to the host kernel. For this, we introduce a new hook in the world switch code, conveniently placed just after populating the fault info. At that point, we only have saved/restored the GP registers, and we can quickly perform all the required checks (data abort, translation fault, valid faulting syndrome, not an external abort, not a PTW). Coming back from the emulation code, we need to skip the emulated instruction. This involves an additional bit of save/restore in order to be able to access the guest's PC (and possibly CPSR if this is a 32bit guest). At this stage, no emulation code is provided. Signed-off-by: Marc Zyngier Reviewed-by: Christoffer Dall Signed-off-by: Christoffer Dall

arm64: KVM: Refactor kern_hyp_va to deal with multiple offsets

2016-07-03T21:41:27Z

As we move towards a selectable HYP VA range, it is obvious that we don't want to test a variable to find out if we need to use the bottom VA range, the top VA range, or use the address as is (for VHE). Instead, we can expand our current helper to generate the right mask or nop with code patching. We default to using the top VA space, with alternatives to switch to the bottom one or to nop out the instructions. Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall

arm/arm64: KVM: Remove hyp_kern_va helper

2016-07-03T21:41:27Z

hyp_kern_va is now completely unused, so let's remove it entirely. Signed-off-by: Marc Zyngier Signed-off-by: Christoffer Dall

arm64: perf: Move PMU register related defines to asm/perf_event.h

2016-03-29T15:04:57Z

To use the ARMv8 PMU related register defines from the KVM code, we move the relevant definitions to asm/perf_event.h header file and rename them with prefix ARMV8_PMU_. This allows us to get rid of kvm_perf_event.h. Signed-off-by: Anup Patel Signed-off-by: Shannon Zhao Acked-by: Marc Zyngier Reviewed-by: Andrew Jones Signed-off-by: Marc Zyngier Signed-off-by: Will Deacon

arm64: KVM: Add access handler for PMUSERENR register

2016-02-29T18:34:21Z

This register resets as unknown in 64bit mode while it resets as zero in 32bit mode. Here we choose to reset it as zero for consistency. PMUSERENR_EL0 holds some bits which decide whether PMU registers can be accessed from EL0. Add some check helpers to handle the access from EL0. When these bits are zero, only reading PMUSERENR will trap to EL2 and writing PMUSERENR or reading/writing other PMU registers will trap to EL1 other than EL2 when HCR.TGE==0. To current KVM configuration (HCR.TGE==0) there is no way to get these traps. Here we write 0xf to physical PMUSERENR register on VM entry, so that it will trap PMU access from EL0 to EL2. Within the register access handler we check the real value of guest PMUSERENR register to decide whether this access is allowed. If not allowed, return false to inject UND to guest. Signed-off-by: Shannon Zhao Signed-off-by: Marc Zyngier

arm64: KVM: Move kvm/hyp/hyp.h to include/asm/kvm_hyp.h

2016-02-29T18:34:18Z

In order to be able to move code outside of kvm/hyp, we need to make the global hyp.h file accessible from a standard location. include/asm/kvm_hyp.h seems good enough. Acked-by: Christoffer Dall Signed-off-by: Marc Zyngier