kernel/linux.git/include/kvm/arm_pmu.h, branch v6.1

KVM: arm64: pmu: Restore compilation when HW_PERF_EVENTS isn't selected

2022-05-16T12:42:41+00:00

Moving kvm_pmu_events into the vcpu (and refering to it) broke the somewhat unusual case where the kernel has no support for a PMU at all. In order to solve this, move things around a bit so that we can easily avoid refering to the pmu structure outside of PMU-aware code. As a bonus, pmu.c isn't compiled in when HW_PERF_EVENTS isn't selected. Reported-by: kernel test robot Reviewed-by: Fuad Tabba Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/202205161814.KQHpOzsJ-lkp@intel.com

KVM: arm64: Pass pmu events to hyp via vcpu

2022-05-15T10:26:41+00:00

Instead of the host accessing hyp data directly, pass the pmu events of the current cpu to hyp via the vcpu. This adds 64 bits (in two fields) to the vcpu that need to be synced before every vcpu run in nvhe and protected modes. However, it isolates the hypervisor from the host, which allows us to use pmu in protected mode in a subsequent patch. No visible side effects in behavior intended. Signed-off-by: Fuad Tabba Reviewed-by: Oliver Upton Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20220510095710.148178-4-tabba@google.com

KVM: arm64: Repack struct kvm_pmu to reduce size

2022-05-15T10:24:17+00:00

struct kvm_pmu has 2 holes using 10 bytes. This is instantiated in all vcpus, so it adds up. Repack the structures to remove the holes. No functional change intended. Reviewed-by: Oliver Upton Signed-off-by: Fuad Tabba Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20220510095710.148178-3-tabba@google.com

KVM: arm64: Keep a list of probed PMUs

2022-02-08T17:51:21+00:00

The ARM PMU driver calls kvm_host_pmu_init() after probing to tell KVM that a hardware PMU is available for guest emulation. Heterogeneous systems can have more than one PMU present, and the callback gets called multiple times, once for each of them. Keep track of all the PMUs available to KVM, as they're going to be needed later. Reviewed-by: Reiji Watanabe Signed-off-by: Alexandru Elisei Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20220127161759.53553-5-alexandru.elisei@arm.com

KVM: arm64: Hide kvm_arm_pmu_available behind CONFIG_HW_PERF_EVENTS=y

2021-11-17T13:49:11+00:00

Move the definition of kvm_arm_pmu_available to pmu-emul.c and, out of "necessity", hide it behind CONFIG_HW_PERF_EVENTS. Provide a stub for the key's wrapper, kvm_arm_support_pmu_v3(). Moving the key's definition out of perf.c will allow a future commit to delete perf.c entirely. Signed-off-by: Sean Christopherson Signed-off-by: Peter Zijlstra (Intel) Link: https://lore.kernel.org/r/20211111020738.2512932-16-seanjc@google.com

KVM: arm64: Fix PMU probe ordering

2021-09-20T11:43:34+00:00

Russell reported that since 5.13, KVM's probing of the PMU has started to fail on his HW. As it turns out, there is an implicit ordering dependency between the architectural PMU probing code and and KVM's own probing. If, due to probe ordering reasons, KVM probes before the PMU driver, it will fail to detect the PMU and prevent it from being advertised to guests as well as the VMM. Obviously, this is one probing too many, and we should be able to deal with any ordering. Add a callback from the PMU code into KVM to advertise the registration of a host CPU PMU, allowing for any probing order. Fixes: 5421db1be3b1 ("KVM: arm64: Divorce the perf code from oprofile helpers") Reported-by: "Russell King (Oracle)" Tested-by: Russell King (Oracle) Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/YUYRKVflRtUytzy5@shell.armlinux.org.uk Cc: stable@vger.kernel.org

KVM: arm64: Divorce the perf code from oprofile helpers

2021-04-22T12:32:39+00:00

KVM/arm64 is the sole user of perf_num_counters(), and really could do without it. Stop using the obsolete API by relying on the existing probing code. Signed-off-by: Marc Zyngier Acked-by: Will Deacon Link: https://lore.kernel.org/r/20210414134409.1266357-2-maz@kernel.org

KVM: arm64: Turn kvm_arm_support_pmu_v3() into a static key

2021-03-06T09:18:40+00:00

We currently find out about the presence of a HW PMU (or the handling of that PMU by perf, which amounts to the same thing) in a fairly roundabout way, by checking the number of counters available to perf. That's good enough for now, but we will soon need to find about about that on paths where perf is out of reach (in the world switch). Instead, let's turn kvm_arm_support_pmu_v3() into a static key. Signed-off-by: Marc Zyngier Reviewed-by: Alexandru Elisei Link: https://lore.kernel.org/r/20210209114844.3278746-2-maz@kernel.org Message-Id: <20210305185254.3730990-5-maz@kernel.org> Signed-off-by: Paolo Bonzini

KVM: arm64: Replace KVM_ARM_PMU with HW_PERF_EVENTS

2021-01-04T16:50:16+00:00

KVM_ARM_PMU only existed for the benefit of 32bit ARM hosts, and makes no sense now that we are 64bit only. Get rid of it. Signed-off-by: Marc Zyngier

KVM: arm64: Get rid of the PMU ready state

2020-11-27T11:41:24+00:00

The PMU ready state has no user left. Goodbye. Reviewed-by: Alexandru Elisei Signed-off-by: Marc Zyngier