From: junyan.he@gmx.com
To: qemu-devel@nongnu.org
Cc: ehabkost@redhat.com, imammedo@redhat.com, pbonzini@redhat.com,
crosthwaite.peter@gmail.com, rth@twiddle.net,
xiaoguangrong.eric@gmail.com, mst@redhat.com,
quintela@redhat.com, dgilbert@redhat.com, stefanha@redhat.com,
Junyan He <junyan.he@intel.com>,
Haozhong Zhang <haozhong.zhang@intel.com>
Subject: [Qemu-devel] [PATCH 2/7 V7] memory, exec: switch file ram allocation functions to 'flags' parameters
Date: Tue, 12 Jun 2018 14:28:15 +0800 [thread overview]
Message-ID: <1528784900-7310-3-git-send-email-junyan.he@gmx.com> (raw)
In-Reply-To: <1528784900-7310-1-git-send-email-junyan.he@gmx.com>
From: Junyan He <junyan.he@intel.com>
As more flag parameters besides the existing 'share' are going to be
added to following functions
memory_region_init_ram_from_file
qemu_ram_alloc_from_fd
qemu_ram_alloc_from_file
let's switch them to use the 'flags' parameters so as to ease future
flag additions.
The existing 'share' flag is converted to the RAM_SHARED bit in ram_flags,
and other flag bits are ignored by above functions right now.
Signed-off-by: Junyan He <junyan.he@intel.com>
Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
backends/hostmem-file.c | 3 ++-
exec.c | 10 +++++-----
include/exec/memory.h | 7 +++++--
include/exec/ram_addr.h | 25 +++++++++++++++++++++++--
memory.c | 8 +++++---
numa.c | 2 +-
6 files changed, 41 insertions(+), 14 deletions(-)
diff --git a/backends/hostmem-file.c b/backends/hostmem-file.c
index 134b08d..34c68bb 100644
--- a/backends/hostmem-file.c
+++ b/backends/hostmem-file.c
@@ -58,7 +58,8 @@ file_backend_memory_alloc(HostMemoryBackend *backend, Error **errp)
path = object_get_canonical_path(OBJECT(backend));
memory_region_init_ram_from_file(&backend->mr, OBJECT(backend),
path,
- backend->size, fb->align, backend->share,
+ backend->size, fb->align,
+ backend->share ? RAM_SHARED : 0,
fb->mem_path, errp);
g_free(path);
}
diff --git a/exec.c b/exec.c
index 9246722..8e079df 100644
--- a/exec.c
+++ b/exec.c
@@ -2070,7 +2070,7 @@ static void ram_block_add(RAMBlock *new_block, Error **errp, bool shared)
#ifdef __linux__
RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
- bool share, int fd,
+ uint64_t ram_flags, int fd,
Error **errp)
{
RAMBlock *new_block;
@@ -2112,14 +2112,14 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
new_block->mr = mr;
new_block->used_length = size;
new_block->max_length = size;
- new_block->flags = share ? RAM_SHARED : 0;
+ new_block->flags = ram_flags;
new_block->host = file_ram_alloc(new_block, size, fd, !file_size, errp);
if (!new_block->host) {
g_free(new_block);
return NULL;
}
- ram_block_add(new_block, &local_err, share);
+ ram_block_add(new_block, &local_err, ram_flags & RAM_SHARED);
if (local_err) {
g_free(new_block);
error_propagate(errp, local_err);
@@ -2131,7 +2131,7 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
- bool share, const char *mem_path,
+ uint64_t ram_flags, const char *mem_path,
Error **errp)
{
int fd;
@@ -2143,7 +2143,7 @@ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
return NULL;
}
- block = qemu_ram_alloc_from_fd(size, mr, share, fd, errp);
+ block = qemu_ram_alloc_from_fd(size, mr, ram_flags, fd, errp);
if (!block) {
if (created) {
unlink(mem_path);
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 1bb9172..3769c06 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -599,6 +599,7 @@ void memory_region_init_resizeable_ram(MemoryRegion *mr,
void *host),
Error **errp);
#ifdef __linux__
+
/**
* memory_region_init_ram_from_file: Initialize RAM memory region with a
* mmap-ed backend.
@@ -610,7 +611,9 @@ void memory_region_init_resizeable_ram(MemoryRegion *mr,
* @size: size of the region.
* @align: alignment of the region base address; if 0, the default alignment
* (getpagesize()) will be used.
- * @share: %true if memory must be mmaped with the MAP_SHARED flag
+ * @ram_flags: Memory region features:
+ * - RAM_SHARED: memory must be mmaped with the MAP_SHARED flag
+ * Other bits are ignored now.
* @path: the path in which to allocate the RAM.
* @errp: pointer to Error*, to store an error if it happens.
*
@@ -622,7 +625,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr,
const char *name,
uint64_t size,
uint64_t align,
- bool share,
+ uint64_t ram_flags,
const char *path,
Error **errp);
diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
index cf2446a..5545cf3 100644
--- a/include/exec/ram_addr.h
+++ b/include/exec/ram_addr.h
@@ -72,12 +72,33 @@ static inline unsigned long int ramblock_recv_bitmap_offset(void *host_addr,
long qemu_getrampagesize(void);
unsigned long last_ram_page(void);
+
+/**
+ * qemu_ram_alloc_from_file,
+ * qemu_ram_alloc_from_fd: Allocate a ram block from the specified backing
+ * file or device
+ *
+ * Parameters:
+ * @size: the size in bytes of the ram block
+ * @mr: the memory region where the ram block is
+ * @ram_flags: specify the properties of the ram block, which can be one
+ * or bit-or of following values
+ * - RAM_SHARED: mmap the backing file or device with MAP_SHARED
+ * Other bits are ignored.
+ * @mem_path or @fd: specify the backing file or device
+ * @errp: pointer to Error*, to store an error if it happens
+ *
+ * Return:
+ * On success, return a pointer to the ram block.
+ * On failure, return NULL.
+ */
RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
- bool share, const char *mem_path,
+ uint64_t ram_flags, const char *mem_path,
Error **errp);
RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
- bool share, int fd,
+ uint64_t ram_flags, int fd,
Error **errp);
+
RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
MemoryRegion *mr, Error **errp);
RAMBlock *qemu_ram_alloc(ram_addr_t size, bool share, MemoryRegion *mr,
diff --git a/memory.c b/memory.c
index 3212acc..240e47a 100644
--- a/memory.c
+++ b/memory.c
@@ -1551,7 +1551,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr,
const char *name,
uint64_t size,
uint64_t align,
- bool share,
+ uint64_t ram_flags,
const char *path,
Error **errp)
{
@@ -1560,7 +1560,7 @@ void memory_region_init_ram_from_file(MemoryRegion *mr,
mr->terminates = true;
mr->destructor = memory_region_destructor_ram;
mr->align = align;
- mr->ram_block = qemu_ram_alloc_from_file(size, mr, share, path, errp);
+ mr->ram_block = qemu_ram_alloc_from_file(size, mr, ram_flags, path, errp);
mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
}
@@ -1576,7 +1576,9 @@ void memory_region_init_ram_from_fd(MemoryRegion *mr,
mr->ram = true;
mr->terminates = true;
mr->destructor = memory_region_destructor_ram;
- mr->ram_block = qemu_ram_alloc_from_fd(size, mr, share, fd, errp);
+ mr->ram_block = qemu_ram_alloc_from_fd(size, mr,
+ share ? RAM_SHARED : 0,
+ fd, errp);
mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
}
#endif
diff --git a/numa.c b/numa.c
index 33572bf..ba72267 100644
--- a/numa.c
+++ b/numa.c
@@ -479,7 +479,7 @@ static void allocate_system_memory_nonnuma(MemoryRegion *mr, Object *owner,
if (mem_path) {
#ifdef __linux__
Error *err = NULL;
- memory_region_init_ram_from_file(mr, owner, name, ram_size, 0, false,
+ memory_region_init_ram_from_file(mr, owner, name, ram_size, 0, 0,
mem_path, &err);
if (err) {
error_report_err(err);
--
2.7.4
next prev parent reply other threads:[~2018-06-12 6:28 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-12 6:28 [Qemu-devel] [PATCH 0/7 V7] nvdimm: guarantee persistence of QEMU writes to persistent memory junyan.he
2018-06-12 6:28 ` [Qemu-devel] [PATCH 1/7 V7] memory, exec: Expose all memory block related flags junyan.he
2018-06-12 6:28 ` junyan.he [this message]
2018-06-12 6:28 ` [Qemu-devel] [PATCH 3/7 V7] hostmem-file: add the 'pmem' option junyan.he
2018-06-15 9:03 ` Igor Mammedov
2018-06-19 3:29 ` He, Junyan
2018-07-03 8:02 ` junyan.he
2018-06-12 6:28 ` [Qemu-devel] [PATCH 4/7 V7] configure: add libpmem support junyan.he
2018-06-12 6:28 ` [Qemu-devel] [PATCH 5/7 V7] mem/nvdimm: ensure write persistence to PMEM in label emulation junyan.he
2018-06-12 6:28 ` [Qemu-devel] [PATCH 6/7 V7] migration/ram: Add check and info message to nvdimm post copy junyan.he
2018-06-12 6:28 ` [Qemu-devel] [PATCH 7/7 V7] migration/ram: ensure write persistence on loading all data to PMEM junyan.he
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