Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 136 insertions, 0 deletions

diff --git a/arch/x86/kvm/pmu.h b/arch/x86/kvm/pmu.h
new file mode 100644
index 000000000..7b4828e50
--- /dev/null
+++ b/arch/x86/kvm/pmu.h
@@ -0,0 +1,136 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __KVM_X86_PMU_H
+#define __KVM_X86_PMU_H
+
+#include <linux/nospec.h>
+
+#define vcpu_to_pmu(vcpu) (&(vcpu)->arch.pmu)
+#define pmu_to_vcpu(pmu)  (container_of((pmu), struct kvm_vcpu, arch.pmu))
+#define pmc_to_pmu(pmc)   (&(pmc)->vcpu->arch.pmu)
+
+/* retrieve the 4 bits for EN and PMI out of IA32_FIXED_CTR_CTRL */
+#define fixed_ctrl_field(ctrl_reg, idx) (((ctrl_reg) >> ((idx)*4)) & 0xf)
+
+#define VMWARE_BACKDOOR_PMC_HOST_TSC		0x10000
+#define VMWARE_BACKDOOR_PMC_REAL_TIME		0x10001
+#define VMWARE_BACKDOOR_PMC_APPARENT_TIME	0x10002
+
+struct kvm_event_hw_type_mapping {
+	u8 eventsel;
+	u8 unit_mask;
+	unsigned event_type;
+};
+
+struct kvm_pmu_ops {
+	unsigned (*find_arch_event)(struct kvm_pmu *pmu, u8 event_select,
+				    u8 unit_mask);
+	unsigned (*find_fixed_event)(int idx);
+	bool (*pmc_is_enabled)(struct kvm_pmc *pmc);
+	struct kvm_pmc *(*pmc_idx_to_pmc)(struct kvm_pmu *pmu, int pmc_idx);
+	struct kvm_pmc *(*msr_idx_to_pmc)(struct kvm_vcpu *vcpu, unsigned idx,
+					  u64 *mask);
+	int (*is_valid_msr_idx)(struct kvm_vcpu *vcpu, unsigned idx);
+	bool (*is_valid_msr)(struct kvm_vcpu *vcpu, u32 msr);
+	int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
+	int (*set_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr_info);
+	void (*refresh)(struct kvm_vcpu *vcpu);
+	void (*init)(struct kvm_vcpu *vcpu);
+	void (*reset)(struct kvm_vcpu *vcpu);
+};
+
+static inline u64 pmc_bitmask(struct kvm_pmc *pmc)
+{
+	struct kvm_pmu *pmu = pmc_to_pmu(pmc);
+
+	return pmu->counter_bitmask[pmc->type];
+}
+
+static inline u64 pmc_read_counter(struct kvm_pmc *pmc)
+{
+	u64 counter, enabled, running;
+
+	counter = pmc->counter;
+	if (pmc->perf_event)
+		counter += perf_event_read_value(pmc->perf_event,
+						 &enabled, &running);
+	/* FIXME: Scaling needed? */
+	return counter & pmc_bitmask(pmc);
+}
+
+static inline void pmc_stop_counter(struct kvm_pmc *pmc)
+{
+	if (pmc->perf_event) {
+		pmc->counter = pmc_read_counter(pmc);
+		perf_event_release_kernel(pmc->perf_event);
+		pmc->perf_event = NULL;
+	}
+}
+
+static inline bool pmc_is_gp(struct kvm_pmc *pmc)
+{
+	return pmc->type == KVM_PMC_GP;
+}
+
+static inline bool pmc_is_fixed(struct kvm_pmc *pmc)
+{
+	return pmc->type == KVM_PMC_FIXED;
+}
+
+static inline bool pmc_is_enabled(struct kvm_pmc *pmc)
+{
+	return kvm_x86_ops->pmu_ops->pmc_is_enabled(pmc);
+}
+
+/* returns general purpose PMC with the specified MSR. Note that it can be
+ * used for both PERFCTRn and EVNTSELn; that is why it accepts base as a
+ * paramenter to tell them apart.
+ */
+static inline struct kvm_pmc *get_gp_pmc(struct kvm_pmu *pmu, u32 msr,
+					 u32 base)
+{
+	if (msr >= base && msr < base + pmu->nr_arch_gp_counters) {
+		u32 index = array_index_nospec(msr - base,
+					       pmu->nr_arch_gp_counters);
+
+		return &pmu->gp_counters[index];
+	}
+
+	return NULL;
+}
+
+/* returns fixed PMC with the specified MSR */
+static inline struct kvm_pmc *get_fixed_pmc(struct kvm_pmu *pmu, u32 msr)
+{
+	int base = MSR_CORE_PERF_FIXED_CTR0;
+
+	if (msr >= base && msr < base + pmu->nr_arch_fixed_counters) {
+		u32 index = array_index_nospec(msr - base,
+					       pmu->nr_arch_fixed_counters);
+
+		return &pmu->fixed_counters[index];
+	}
+
+	return NULL;
+}
+
+void reprogram_gp_counter(struct kvm_pmc *pmc, u64 eventsel);
+void reprogram_fixed_counter(struct kvm_pmc *pmc, u8 ctrl, int fixed_idx);
+void reprogram_counter(struct kvm_pmu *pmu, int pmc_idx);
+
+void kvm_pmu_deliver_pmi(struct kvm_vcpu *vcpu);
+void kvm_pmu_handle_event(struct kvm_vcpu *vcpu);
+int kvm_pmu_rdpmc(struct kvm_vcpu *vcpu, unsigned pmc, u64 *data);
+int kvm_pmu_is_valid_msr_idx(struct kvm_vcpu *vcpu, unsigned idx);
+bool kvm_pmu_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr);
+int kvm_pmu_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
+int kvm_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info);
+void kvm_pmu_refresh(struct kvm_vcpu *vcpu);
+void kvm_pmu_reset(struct kvm_vcpu *vcpu);
+void kvm_pmu_init(struct kvm_vcpu *vcpu);
+void kvm_pmu_destroy(struct kvm_vcpu *vcpu);
+
+bool is_vmware_backdoor_pmc(u32 pmc_idx);
+
+extern struct kvm_pmu_ops intel_pmu_ops;
+extern struct kvm_pmu_ops amd_pmu_ops;
+#endif /* __KVM_X86_PMU_H */