On Thu, Jun 26, 2025 at 08:04:40PM +0000, Colton Lewis wrote:
From: Marc Zyngier maz@kernel.org
Reorganize these tangled headers.
In prior versions of this series, there was some earlier text explaining that there was a circular header dependency. In v2:
https://lore.kernel.org/linux-arm-kernel/20250620221326.1261128-6-coltonlewi...
... it said:
| asm/kvm_host.h includes asm/arm_pmu.h which includes perf/arm_pmuv3.h | which includes asm/arm_pmuv3.h which includes asm/kvm_host.h This | causes compilation problems why trying to use anything defined in any | of the headers in any other headers.
Was there some reason for dropping that? It's a bit odd to start without a problem statement.
Respect the move defining the interface between KVM and PMU in its own header asm/kvm_pmu.h
Define an empty struct arm_pmu so it is defined for those interface functions when compiling with CONFIG_KVM but not CONFIG_ARM_PMU
Which functions in particular are those? What prevents them from depending on CONFIG_ARM_PMU?
Mark.
Signed-off-by: Marc Zyngier maz@kernel.org Signed-off-by: Colton Lewis coltonlewis@google.com
arch/arm64/include/asm/arm_pmuv3.h | 2 +- arch/arm64/include/asm/kvm_host.h | 15 +-------------- arch/arm64/include/asm/kvm_pmu.h | 15 +++++++++++++++ arch/arm64/kvm/debug.c | 1 + arch/arm64/kvm/hyp/include/hyp/switch.h | 1 + arch/arm64/kvm/pmu.c | 2 ++ arch/arm64/kvm/sys_regs.c | 1 + include/linux/perf/arm_pmu.h | 5 +++++ virt/kvm/kvm_main.c | 1 + 9 files changed, 28 insertions(+), 15 deletions(-)
diff --git a/arch/arm64/include/asm/arm_pmuv3.h b/arch/arm64/include/asm/arm_pmuv3.h index 8a777dec8d88..32c003a7b810 100644 --- a/arch/arm64/include/asm/arm_pmuv3.h +++ b/arch/arm64/include/asm/arm_pmuv3.h @@ -6,7 +6,7 @@ #ifndef __ASM_PMUV3_H #define __ASM_PMUV3_H -#include <asm/kvm_host.h> +#include <asm/kvm_pmu.h> #include <asm/cpufeature.h> #include <asm/sysreg.h> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 27ed26bd4381..2df76689381a 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -14,6 +14,7 @@ #include <linux/arm-smccc.h> #include <linux/bitmap.h> #include <linux/types.h> +#include <linux/irq_work.h> #include <linux/jump_label.h> #include <linux/kvm_types.h> #include <linux/maple_tree.h> @@ -1487,25 +1488,11 @@ void kvm_arch_vcpu_ctxflush_fp(struct kvm_vcpu *vcpu); void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu); void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu); -static inline bool kvm_pmu_counter_deferred(struct perf_event_attr *attr) -{
- return (!has_vhe() && attr->exclude_host);
-}
#ifdef CONFIG_KVM -void kvm_set_pmu_events(u64 set, struct perf_event_attr *attr); -void kvm_clr_pmu_events(u64 clr); -bool kvm_set_pmuserenr(u64 val); void kvm_enable_trbe(void); void kvm_disable_trbe(void); void kvm_tracing_set_el1_configuration(u64 trfcr_while_in_guest); #else -static inline void kvm_set_pmu_events(u64 set, struct perf_event_attr *attr) {} -static inline void kvm_clr_pmu_events(u64 clr) {} -static inline bool kvm_set_pmuserenr(u64 val) -{
- return false;
-} static inline void kvm_enable_trbe(void) {} static inline void kvm_disable_trbe(void) {} static inline void kvm_tracing_set_el1_configuration(u64 trfcr_while_in_guest) {} diff --git a/arch/arm64/include/asm/kvm_pmu.h b/arch/arm64/include/asm/kvm_pmu.h index baf028d19dfc..ad3247b46838 100644 --- a/arch/arm64/include/asm/kvm_pmu.h +++ b/arch/arm64/include/asm/kvm_pmu.h @@ -11,9 +11,15 @@ #include <linux/kvm_types.h> #include <linux/perf_event.h> #include <linux/perf/arm_pmuv3.h> +#include <linux/perf/arm_pmu.h> #define KVM_ARMV8_PMU_MAX_COUNTERS 32 +#define kvm_pmu_counter_deferred(attr) \
- ({ \
!has_vhe() && (attr)->exclude_host; \- })
#if IS_ENABLED(CONFIG_HW_PERF_EVENTS) && IS_ENABLED(CONFIG_KVM) struct kvm_pmc { u8 idx; /* index into the pmu->pmc array */ @@ -68,6 +74,9 @@ int kvm_arm_pmu_v3_has_attr(struct kvm_vcpu *vcpu, int kvm_arm_pmu_v3_enable(struct kvm_vcpu *vcpu); struct kvm_pmu_events *kvm_get_pmu_events(void); +void kvm_set_pmu_events(u64 set, struct perf_event_attr *attr); +void kvm_clr_pmu_events(u64 clr); +bool kvm_set_pmuserenr(u64 val); void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu); void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu); void kvm_vcpu_pmu_resync_el0(void); @@ -161,6 +170,12 @@ static inline u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1) #define kvm_vcpu_has_pmu(vcpu) ({ false; }) static inline void kvm_pmu_update_vcpu_events(struct kvm_vcpu *vcpu) {} +static inline void kvm_set_pmu_events(u64 set, struct perf_event_attr *attr) {} +static inline void kvm_clr_pmu_events(u64 clr) {} +static inline bool kvm_set_pmuserenr(u64 val) +{
- return false;
+} static inline void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu) {} static inline void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu) {} static inline void kvm_vcpu_reload_pmu(struct kvm_vcpu *vcpu) {} diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c index 1a7dab333f55..a554c3e368dc 100644 --- a/arch/arm64/kvm/debug.c +++ b/arch/arm64/kvm/debug.c @@ -9,6 +9,7 @@ #include <linux/kvm_host.h> #include <linux/hw_breakpoint.h> +#include <linux/perf/arm_pmuv3.h> #include <asm/debug-monitors.h> #include <asm/kvm_asm.h> diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h index 7599844908c0..825b81749972 100644 --- a/arch/arm64/kvm/hyp/include/hyp/switch.h +++ b/arch/arm64/kvm/hyp/include/hyp/switch.h @@ -14,6 +14,7 @@ #include <linux/kvm_host.h> #include <linux/types.h> #include <linux/jump_label.h> +#include <linux/perf/arm_pmuv3.h> #include <uapi/linux/psci.h> #include <asm/barrier.h> diff --git a/arch/arm64/kvm/pmu.c b/arch/arm64/kvm/pmu.c index 6b48a3d16d0d..8bfc6b0a85f6 100644 --- a/arch/arm64/kvm/pmu.c +++ b/arch/arm64/kvm/pmu.c @@ -8,6 +8,8 @@ #include <linux/perf/arm_pmu.h> #include <linux/perf/arm_pmuv3.h> +#include <asm/kvm_pmu.h>
static DEFINE_PER_CPU(struct kvm_pmu_events, kvm_pmu_events); /* diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 99fdbe174202..eaff6d63ef77 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -18,6 +18,7 @@ #include <linux/printk.h> #include <linux/uaccess.h> #include <linux/irqchip/arm-gic-v3.h> +#include <linux/perf/arm_pmuv3.h> #include <asm/arm_pmuv3.h> #include <asm/cacheflush.h> diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h index 6dc5e0cd76ca..fb382bcd4f4b 100644 --- a/include/linux/perf/arm_pmu.h +++ b/include/linux/perf/arm_pmu.h @@ -187,6 +187,11 @@ void armpmu_free_irq(int irq, int cpu); #define ARMV8_PMU_PDEV_NAME "armv8-pmu" +#else
+struct arm_pmu { +};
#endif /* CONFIG_ARM_PMU */ #define ARMV8_SPE_PDEV_NAME "arm,spe-v1" diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index e2f6344256ce..25259fcf3115 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -48,6 +48,7 @@ #include <linux/lockdep.h> #include <linux/kthread.h> #include <linux/suspend.h> +#include <linux/perf_event.h> #include <asm/processor.h>
#include <asm/ioctl.h>
2.50.0.727.gbf7dc18ff4-goog