exec, kvm, target-ppc: Move getrampagesize() to common code

getrampagesize() returns the largest supported page size and mainly
used to know if huge pages are enabled.

However is implemented in target-ppc/kvm.c and not available
in TCG or other architectures.

This renames and moves gethugepagesize() to mmap-alloc.c where
fd-based analog of it is already implemented. This renames and moves
getrampagesize() to exec.c as it seems to be the common place for
helpers like this.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 5 insertions, 104 deletions

diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c
index acc40ec..9b51484 100644
--- a/target/ppc/kvm.c
+++ b/target/ppc/kvm.c
@@ -28,7 +28,6 @@
 #include "qemu/timer.h"
 #include "sysemu/sysemu.h"
 #include "sysemu/hw_accel.h"
-#include "sysemu/numa.h"
 #include "kvm_ppc.h"
 #include "sysemu/cpus.h"
 #include "sysemu/device_tree.h"
@@ -43,8 +42,10 @@
 #include "trace.h"
 #include "exec/gdbstub.h"
 #include "exec/memattrs.h"
+#include "exec/ram_addr.h"
 #include "sysemu/hostmem.h"
 #include "qemu/cutils.h"
+#include "qemu/mmap-alloc.h"
 #if defined(TARGET_PPC64)
 #include "hw/ppc/spapr_cpu_core.h"
 #endif
@@ -329,106 +330,6 @@ static void kvm_get_smmu_info(PowerPCCPU *cpu, struct kvm_ppc_smmu_info *info)
     kvm_get_fallback_smmu_info(cpu, info);
 }
 
-static long gethugepagesize(const char *mem_path)
-{
-    struct statfs fs;
-    int ret;
-
-    do {
-        ret = statfs(mem_path, &fs);
-    } while (ret != 0 && errno == EINTR);
-
-    if (ret != 0) {
-        fprintf(stderr, "Couldn't statfs() memory path: %s\n",
-                strerror(errno));
-        exit(1);
-    }
-
-#define HUGETLBFS_MAGIC       0x958458f6
-
-    if (fs.f_type != HUGETLBFS_MAGIC) {
-        /* Explicit mempath, but it's ordinary pages */
-        return getpagesize();
-    }
-
-    /* It's hugepage, return the huge page size */
-    return fs.f_bsize;
-}
-
-/*
- * FIXME TOCTTOU: this iterates over memory backends' mem-path, which
- * may or may not name the same files / on the same filesystem now as
- * when we actually open and map them.  Iterate over the file
- * descriptors instead, and use qemu_fd_getpagesize().
- */
-static int find_max_supported_pagesize(Object *obj, void *opaque)
-{
-    char *mem_path;
-    long *hpsize_min = opaque;
-
-    if (object_dynamic_cast(obj, TYPE_MEMORY_BACKEND)) {
-        mem_path = object_property_get_str(obj, "mem-path", NULL);
-        if (mem_path) {
-            long hpsize = gethugepagesize(mem_path);
-            if (hpsize < *hpsize_min) {
-                *hpsize_min = hpsize;
-            }
-        } else {
-            *hpsize_min = getpagesize();
-        }
-    }
-
-    return 0;
-}
-
-static long getrampagesize(void)
-{
-    long hpsize = LONG_MAX;
-    long mainrampagesize;
-    Object *memdev_root;
-
-    if (mem_path) {
-        mainrampagesize = gethugepagesize(mem_path);
-    } else {
-        mainrampagesize = getpagesize();
-    }
-
-    /* it's possible we have memory-backend objects with
-     * hugepage-backed RAM. these may get mapped into system
-     * address space via -numa parameters or memory hotplug
-     * hooks. we want to take these into account, but we
-     * also want to make sure these supported hugepage
-     * sizes are applicable across the entire range of memory
-     * we may boot from, so we take the min across all
-     * backends, and assume normal pages in cases where a
-     * backend isn't backed by hugepages.
-     */
-    memdev_root = object_resolve_path("/objects", NULL);
-    if (memdev_root) {
-        object_child_foreach(memdev_root, find_max_supported_pagesize, &hpsize);
-    }
-    if (hpsize == LONG_MAX) {
-        /* No additional memory regions found ==> Report main RAM page size */
-        return mainrampagesize;
-    }
-
-    /* If NUMA is disabled or the NUMA nodes are not backed with a
-     * memory-backend, then there is at least one node using "normal" RAM,
-     * so if its page size is smaller we have got to report that size instead.
-     */
-    if (hpsize > mainrampagesize &&
-        (nb_numa_nodes == 0 || numa_info[0].node_memdev == NULL)) {
-        static bool warned;
-        if (!warned) {
-            error_report("Huge page support disabled (n/a for main memory).");
-            warned = true;
-        }
-        return mainrampagesize;
-    }
-
-    return hpsize;
-}
-
 static bool kvm_valid_page_size(uint32_t flags, long rampgsize, uint32_t shift)
 {
     if (!(flags & KVM_PPC_PAGE_SIZES_REAL)) {
@@ -460,7 +361,7 @@ static void kvm_fixup_page_sizes(PowerPCCPU *cpu)
     }
 
     if (!max_cpu_page_size) {
-        max_cpu_page_size = getrampagesize();
+        max_cpu_page_size = qemu_getrampagesize();
     }
 
     /* Convert to QEMU form */
@@ -521,7 +422,7 @@ bool kvmppc_is_mem_backend_page_size_ok(char *obj_path)
     long pagesize;
 
     if (mempath) {
-        pagesize = gethugepagesize(mempath);
+        pagesize = qemu_mempath_getpagesize(mempath);
     } else {
         pagesize = getpagesize();
     }
@@ -2205,7 +2106,7 @@ uint64_t kvmppc_rma_size(uint64_t current_size, unsigned int hash_shift)
     /* Find the largest hardware supported page size that's less than
      * or equal to the (logical) backing page size of guest RAM */
     kvm_get_smmu_info(POWERPC_CPU(first_cpu), &info);
-    rampagesize = getrampagesize();
+    rampagesize = qemu_getrampagesize();
     best_page_shift = 0;
 
     for (i = 0; i < KVM_PPC_PAGE_SIZES_MAX_SZ; i++) {