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[Qemu-devel] [multiprocess RFC PATCH 01/37] multi-process: memory: alloc
From: |
elena . ufimtseva |
Subject: |
[Qemu-devel] [multiprocess RFC PATCH 01/37] multi-process: memory: alloc RAM from file at offset |
Date: |
Wed, 6 Mar 2019 23:20:41 -0800 |
From: Jagannathan Raman <address@hidden>
Allow RAM MemoryRegion to be created from an offset in a file, instead
of allocating at offset of 0 by default. This is needed to synchronize
RAM between QEMU & remote process.
This will be needed for the following patches.
Signed-off-by: Jagannathan Raman <address@hidden>
Signed-off-by: John G Johnson <address@hidden>
Signed-off-by: Elena Ufimtseva <address@hidden>
---
exec.c | 9 +++++----
include/exec/ram_addr.h | 2 +-
include/qemu/mmap-alloc.h | 2 +-
memory.c | 2 +-
util/mmap-alloc.c | 5 +++--
util/oslib-posix.c | 2 +-
6 files changed, 12 insertions(+), 10 deletions(-)
diff --git a/exec.c b/exec.c
index 1d4f378..dcef041 100644
--- a/exec.c
+++ b/exec.c
@@ -1813,6 +1813,7 @@ static void *file_ram_alloc(RAMBlock *block,
ram_addr_t memory,
int fd,
bool truncate,
+ off_t offset,
Error **errp)
{
void *area;
@@ -1863,7 +1864,7 @@ static void *file_ram_alloc(RAMBlock *block,
}
area = qemu_ram_mmap(fd, memory, block->mr->align,
- block->flags & RAM_SHARED);
+ block->flags & RAM_SHARED, offset);
if (area == MAP_FAILED) {
error_setg_errno(errp, errno,
"unable to map backing store for guest RAM");
@@ -2252,7 +2253,7 @@ static void ram_block_add(RAMBlock *new_block, Error
**errp, bool shared)
#ifdef CONFIG_POSIX
RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
uint32_t ram_flags, int fd,
- Error **errp)
+ off_t offset, Error **errp)
{
RAMBlock *new_block;
Error *local_err = NULL;
@@ -2297,7 +2298,7 @@ RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size,
MemoryRegion *mr,
new_block->used_length = size;
new_block->max_length = size;
new_block->flags = ram_flags;
- new_block->host = file_ram_alloc(new_block, size, fd, !file_size, errp);
+ new_block->host = file_ram_alloc(new_block, size, fd, !file_size, offset,
errp);
if (!new_block->host) {
g_free(new_block);
return NULL;
@@ -2327,7 +2328,7 @@ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size,
MemoryRegion *mr,
return NULL;
}
- block = qemu_ram_alloc_from_fd(size, mr, ram_flags, fd, errp);
+ block = qemu_ram_alloc_from_fd(size, mr, ram_flags, fd, 0, errp);
if (!block) {
if (created) {
unlink(mem_path);
diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
index 9ecd911..2ed4579 100644
--- a/include/exec/ram_addr.h
+++ b/include/exec/ram_addr.h
@@ -100,7 +100,7 @@ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size,
MemoryRegion *mr,
Error **errp);
RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
uint32_t ram_flags, int fd,
- Error **errp);
+ off_t offset, Error **errp);
RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
MemoryRegion *mr, Error **errp);
diff --git a/include/qemu/mmap-alloc.h b/include/qemu/mmap-alloc.h
index ef04f0e..25c4b12 100644
--- a/include/qemu/mmap-alloc.h
+++ b/include/qemu/mmap-alloc.h
@@ -7,7 +7,7 @@ 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_mmap(int fd, size_t size, size_t align, bool shared, off_t
start);
void qemu_ram_munmap(int fd, void *ptr, size_t size);
diff --git a/memory.c b/memory.c
index 61d66e4..ffa91d0 100644
--- a/memory.c
+++ b/memory.c
@@ -1619,7 +1619,7 @@ void memory_region_init_ram_from_fd(MemoryRegion *mr,
mr->destructor = memory_region_destructor_ram;
mr->ram_block = qemu_ram_alloc_from_fd(size, mr,
share ? RAM_SHARED : 0,
- fd, &err);
+ fd, 0, &err);
mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
if (err) {
mr->size = int128_zero();
diff --git a/util/mmap-alloc.c b/util/mmap-alloc.c
index 8565885..58cb4cc 100644
--- a/util/mmap-alloc.c
+++ b/util/mmap-alloc.c
@@ -75,7 +75,7 @@ size_t qemu_mempath_getpagesize(const char *mem_path)
return getpagesize();
}
-void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared)
+void *qemu_ram_mmap(int fd, size_t size, size_t align, bool shared, off_t
start)
{
int flags;
int guardfd;
@@ -130,7 +130,8 @@ void *qemu_ram_mmap(int fd, size_t size, size_t align, bool
shared)
flags |= shared ? MAP_SHARED : MAP_PRIVATE;
offset = QEMU_ALIGN_UP((uintptr_t)guardptr, align) - (uintptr_t)guardptr;
- ptr = mmap(guardptr + offset, size, PROT_READ | PROT_WRITE, flags, fd, 0);
+ ptr = mmap(guardptr + offset, size, PROT_READ | PROT_WRITE, flags, fd,
+ start);
if (ptr == MAP_FAILED) {
munmap(guardptr, total);
diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index 37c5854..e4c6380 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -203,7 +203,7 @@ void *qemu_memalign(size_t alignment, size_t size)
void *qemu_anon_ram_alloc(size_t size, uint64_t *alignment, bool shared)
{
size_t align = QEMU_VMALLOC_ALIGN;
- void *ptr = qemu_ram_mmap(-1, size, align, shared);
+ void *ptr = qemu_ram_mmap(-1, size, align, shared, 0);
if (ptr == MAP_FAILED) {
return NULL;
--
1.8.3.1
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