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 <a...@ozlabs.ru>
---
Changes:
v3:
* in exec.c, moved "include numa.h" under #ifndef CONFIG_USER_ONLY to
fix linux-user target build
v2:
* rebased on top of ppc-for-2.9-20170301
---
include/exec/ram_addr.h | 1 +
include/qemu/mmap-alloc.h | 2 +
exec.c | 82 +++++++++++++++++++++++++++++++++++
target/ppc/kvm.c | 108 +++-------------------------------------------
util/mmap-alloc.c | 25 +++++++++++
5 files changed, 115 insertions(+), 103 deletions(-)
diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
index 3e79466a44..cd432e73ae 100644
--- a/include/exec/ram_addr.h
+++ b/include/exec/ram_addr.h
@@ -52,6 +52,7 @@ static inline void *ramblock_ptr(RAMBlock *block, ram_addr_t
offset)
return (char *)block->host + offset;
}
+long qemu_getrampagesize(void);
ram_addr_t last_ram_offset(void);
RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
bool share, const char *mem_path,
diff --git a/include/qemu/mmap-alloc.h b/include/qemu/mmap-alloc.h
index 933c024ac5..50385e3f81 100644
--- a/include/qemu/mmap-alloc.h
+++ b/include/qemu/mmap-alloc.h
@@ -5,6 +5,8 @@
size_t qemu_fd_getpagesize(int fd);
+size_t qemu_mempath_getpagesize(const char *mem_path);
+
void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared);
void qemu_ram_munmap(void *ptr, size_t size);
diff --git a/exec.c b/exec.c
index 3adf2b1861..4c90cbf366 100644
--- a/exec.c
+++ b/exec.c
@@ -42,6 +42,7 @@
#include "exec/memory.h"
#include "exec/ioport.h"
#include "sysemu/dma.h"
+#include "sysemu/numa.h"
#include "exec/address-spaces.h"
#include "sysemu/xen-mapcache.h"
#include "trace-root.h"
@@ -1251,6 +1252,87 @@ void qemu_mutex_unlock_ramlist(void)
}
#ifdef __linux__
+/*
+ * 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 = qemu_mempath_getpagesize(mem_path);
+ if (hpsize < *hpsize_min) {
+ *hpsize_min = hpsize;
+ }
+ } else {
+ *hpsize_min = getpagesize();
+ }
+ }
+
+ return 0;
+}
+
+long qemu_getrampagesize(void)
+{
+ long hpsize = LONG_MAX;
+ long mainrampagesize;
+ Object *memdev_root;
+
+ if (mem_path) {
+ mainrampagesize = qemu_mempath_getpagesize(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;
+}
+#else
+long qemu_getrampagesize(void)
+{
+ return getpagesize();
+}
+#endif
+
+#ifdef __linux__
static int64_t get_file_size(int fd)
{
int64_t size = lseek(fd, 0, SEEK_END);
diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c
index 18f33f2d93..d2835ef6b3 100644
--- a/target/ppc/kvm.c
+++ b/target/ppc/kvm.c
@@ -43,8 +43,10 @@
#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
@@ -331,106 +333,6 @@ 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)) {
@@ -462,7 +364,7 @@ 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 */
@@ -523,7 +425,7 @@ 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();
}
@@ -2207,7 +2109,7 @@ 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++) {
diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c
index 2f55f5e94f..3ec029a9ea 100644
--- a/util/mmap-alloc.c
+++ b/util/mmap-alloc.c
@@ -40,6 +40,31 @@ size_t qemu_fd_getpagesize(int fd)
return getpagesize();
}
+size_t qemu_mempath_getpagesize(const char *mem_path)
+{
+#ifdef CONFIG_LINUX
+ 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);
+ }
+
+ if (fs.f_type == HUGETLBFS_MAGIC) {
+ /* It's hugepage, return the huge page size */
+ return fs.f_bsize;
+ }
+#endif
+
+ return getpagesize();
+}
+
void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared)
{
/*
--
2.11.0
