Revert "OS-8005 bhyve memory pressure needs to target ARC better (#354)"
This reverts commit a6033573eedd94118d2b9e65f45deca0bf4b42f7.

@@ -36,11 +36,11 @@
  * A full copy of the text of the CDDL should have accompanied this
  * source.  A copy of the CDDL is also available via the Internet at
  * http://www.illumos.org/license/CDDL.
  *
  * Copyright 2015 Pluribus Networks Inc.
- * Copyright 2021 Joyent, Inc.
+ * Copyright 2018 Joyent, Inc.
  * Copyright 2021 Oxide Computer Company
  * Copyright 2021 OmniOS Community Edition (OmniOSce) Association.
  */
 
 #include <sys/cdefs.h>

@@ -187,11 +187,10 @@
         uint16_t        sockets;                /* (o) num of sockets */
         uint16_t        cores;                  /* (o) num of cores/socket */
         uint16_t        threads;                /* (o) num of threads/core */
         uint16_t        maxcpus;                /* (o) max pluggable cpus */
         uint64_t        boot_tsc_offset;        /* (i) TSC offset at VM boot */
-        size_t          arc_resv;               /* # of pages take from ARC */
 
         struct ioport_config ioports;           /* (o) ioport handling */
 };
 
 static int vmm_initialized;

@@ -273,13 +272,10 @@
 static bool sysmem_mapping(struct vm *vm, struct mem_map *mm);
 static void vcpu_notify_event_locked(struct vcpu *vcpu, vcpu_notify_t);
 static bool vcpu_sleep_bailout_checks(struct vm *vm, int vcpuid);
 static int vcpu_vector_sipi(struct vm *vm, int vcpuid, uint8_t vector);
 
-extern int arc_virt_machine_reserve(size_t);
-extern void arc_virt_machine_release(size_t);
-
 /* Flags for vtc_status */
 #define VTCS_FPU_RESTORED       1 /* guest FPU restored, host FPU saved */
 #define VTCS_FPU_CTX_CRITICAL   2 /* in ctx where FPU restore cannot be lazy */
 
 typedef struct vm_thread_ctx {

@@ -621,13 +617,10 @@
                 for (i = 0; i < VM_MAX_MEMSEGS; i++)
                         vm_free_memseg(vm, i);
 
                 VMSPACE_FREE(vm->vmspace);
                 vm->vmspace = NULL;
-
-                arc_virt_machine_release(vm->arc_resv);
-                vm->arc_resv = 0;
         }
 }
 
 void
 vm_destroy(struct vm *vm)

@@ -3661,20 +3654,5 @@
         vvk->vvk_time_emu_user.value.ui64 = vcpu->ustate_total[VU_EMU_USER];
         vvk->vvk_time_sched.value.ui64 = vcpu->ustate_total[VU_SCHED];
 
         return (0);
 }
-
-int
-vm_arc_resv(struct vm *vm, uint64_t len)
-{
-        /* Since we already have the compat macros included, we use those */
-        size_t pages = (size_t)roundup2(len, PAGE_SIZE) >> PAGE_SHIFT;
-        int err = 0;
-
-        err = arc_virt_machine_reserve(pages);
-        if (err != 0)
-                return (err);
-
-        vm->arc_resv += pages;
-        return (0);
-}