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diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -10256,6 +10256,12 @@
PCPU_SET(ucr3, PMAP_NO_CR3);
}
+void
+pmap_active_cpus(pmap_t pmap, cpuset_t *res)
+{
+ *res = pmap->pm_active;
+}
+
void
pmap_sync_icache(pmap_t pm, vm_offset_t va, vm_size_t sz)
{
diff --git a/sys/arm/arm/pmap-v6.c b/sys/arm/arm/pmap-v6.c
--- a/sys/arm/arm/pmap-v6.c
+++ b/sys/arm/arm/pmap-v6.c
@@ -6194,6 +6194,12 @@
critical_exit();
}
+void
+pmap_active_cpus(pmap_t pmap, cpuset_t *res)
+{
+ *res = pmap->pm_active;
+}
+
/*
* Perform the pmap work for mincore(2). If the page is not both referenced and
* modified by this pmap, returns its physical address so that the caller can
diff --git a/sys/arm64/include/pmap.h b/sys/arm64/include/pmap.h
--- a/sys/arm64/include/pmap.h
+++ b/sys/arm64/include/pmap.h
@@ -129,6 +129,8 @@
(uint64_t)(asid) << TTBR_ASID_SHIFT; \
})
+#define PMAP_WANT_ACTIVE_CPUS_NAIVE
+
extern vm_offset_t virtual_avail;
extern vm_offset_t virtual_end;
diff --git a/sys/i386/i386/pmap_base.c b/sys/i386/i386/pmap_base.c
--- a/sys/i386/i386/pmap_base.c
+++ b/sys/i386/i386/pmap_base.c
@@ -944,6 +944,12 @@
pmap_methods_ptr->pm_kremove(va);
}
+void
+pmap_active_cpus(pmap_t pmap, cpuset_t *res)
+{
+ *res = pmap->pm_active;
+}
+
extern struct pmap_methods pmap_pae_methods, pmap_nopae_methods;
int pae_mode;
SYSCTL_INT(_vm_pmap, OID_AUTO, pae_mode, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
diff --git a/sys/powerpc/powerpc/pmap_dispatch.c b/sys/powerpc/powerpc/pmap_dispatch.c
--- a/sys/powerpc/powerpc/pmap_dispatch.c
+++ b/sys/powerpc/powerpc/pmap_dispatch.c
@@ -253,3 +253,9 @@
return (FALSE);
}
}
+
+void
+pmap_active_cpus(pmap_t pmap, cpuset_t *res)
+{
+ *res = pmap->pm_active;
+}
diff --git a/sys/riscv/riscv/pmap.c b/sys/riscv/riscv/pmap.c
--- a/sys/riscv/riscv/pmap.c
+++ b/sys/riscv/riscv/pmap.c
@@ -4687,6 +4687,12 @@
PCPU_SET(curpmap, pmap);
}
+void
+pmap_active_cpus(pmap_t pmap, cpuset_t *res)
+{
+ *res = pmap->pm_active;
+}
+
void
pmap_sync_icache(pmap_t pmap, vm_offset_t va, vm_size_t sz)
{
diff --git a/sys/vm/pmap.h b/sys/vm/pmap.h
--- a/sys/vm/pmap.h
+++ b/sys/vm/pmap.h
@@ -90,6 +90,7 @@
#include <machine/pmap.h>
#ifdef _KERNEL
+#include <sys/_cpuset.h>
struct thread;
/*
@@ -118,6 +119,7 @@
#define PMAP_TS_REFERENCED_MAX 5
void pmap_activate(struct thread *td);
+void pmap_active_cpus(pmap_t pmap, cpuset_t *res);
void pmap_advise(pmap_t pmap, vm_offset_t sva, vm_offset_t eva,
int advice);
void pmap_align_superpage(vm_object_t, vm_ooffset_t, vm_offset_t *,
diff --git a/sys/vm/vm_kern.c b/sys/vm/vm_kern.c
--- a/sys/vm/vm_kern.c
+++ b/sys/vm/vm_kern.c
@@ -78,6 +78,7 @@
#include <sys/msan.h>
#include <sys/proc.h>
#include <sys/rwlock.h>
+#include <sys/smp.h>
#include <sys/sysctl.h>
#include <sys/vmem.h>
#include <sys/vmmeter.h>
@@ -907,6 +908,31 @@
#endif
}
+#ifdef PMAP_WANT_ACTIVE_CPUS_NAIVE
+void
+pmap_active_cpus(pmap_t pmap, cpuset_t *res)
+{
+ struct thread *td;
+ struct proc *p;
+ struct vmspace *vm;
+ int c;
+
+ CPU_ZERO(res);
+ CPU_FOREACH(c) {
+ td = cpuid_to_pcpu[c]->pc_curthread;
+ p = td->td_proc;
+ if (p == NULL)
+ continue;
+ vm = vmspace_acquire_ref(p);
+ if (vm == NULL)
+ continue;
+ if (pmap == vmspace_pmap(vm))
+ CPU_SET(c, res);
+ vmspace_free(vm);
+ }
+}
+#endif
+
/*
* Allow userspace to directly trigger the VM drain routine for testing
* purposes.

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