@@ -246,7 +246,8 @@ static inline ram_addr_t qemu_ram_addr_from_host_nofail(void *ptr)
{
ram_addr_t ram_addr;
- if (qemu_ram_addr_from_host(ptr, &ram_addr) == NULL) {
+ ram_addr = qemu_ram_addr_from_host(ptr);
+ if (ram_addr == RAM_ADDR_INVALID) {
fprintf(stderr, "Bad ram pointer %p\n", ptr);
abort();
}
@@ -1964,18 +1964,17 @@ RAMBlock *qemu_ram_block_by_name(const char *name)
/* Some of the softmmu routines need to translate from a host pointer
(typically a TLB entry) back to a ram offset. */
-MemoryRegion *qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr)
+ram_addr_t qemu_ram_addr_from_host(void *ptr)
{
RAMBlock *block;
ram_addr_t offset;
block = qemu_ram_block_from_host(ptr, false, &offset);
- *ram_addr = block->offset + offset;
if (!block) {
- return NULL;
+ return RAM_ADDR_INVALID;
}
- return block->mr;
+ return block->offset + offset;
}
/* Called within RCU critical section. */
@@ -2975,8 +2974,9 @@ void address_space_unmap(AddressSpace *as, void *buffer, hwaddr len,
MemoryRegion *mr;
ram_addr_t addr1;
- mr = qemu_ram_addr_from_host(buffer, &addr1);
+ mr = memory_region_from_host(buffer, &addr1);
assert(mr != NULL);
+ addr1 += memory_region_get_ram_addr(mr);
if (is_write) {
invalidate_and_set_dirty(mr, addr1, access_len);
}
@@ -17,7 +17,6 @@
#include "sysemu/kvm.h"
#include "qemu/error-report.h"
#include "qemu/sockets.h"
-#include "exec/ram_addr.h"
#include "migration/migration.h"
#include <sys/ioctl.h>
@@ -247,19 +246,18 @@ static int vhost_user_set_mem_table(struct vhost_dev *dev,
for (i = 0; i < dev->mem->nregions; ++i) {
struct vhost_memory_region *reg = dev->mem->regions + i;
- ram_addr_t ram_addr;
+ ram_addr_t offset;
MemoryRegion *mr;
assert((uintptr_t)reg->userspace_addr == reg->userspace_addr);
- mr = qemu_ram_addr_from_host((void *)(uintptr_t)reg->userspace_addr,
- &ram_addr);
+ mr = memory_region_from_host((void *)(uintptr_t)reg->userspace_addr,
+ &offset);
fd = memory_region_get_fd(mr);
if (fd > 0) {
msg.payload.memory.regions[fd_num].userspace_addr = reg->userspace_addr;
msg.payload.memory.regions[fd_num].memory_size = reg->memory_size;
msg.payload.memory.regions[fd_num].guest_phys_addr = reg->guest_phys_addr;
- msg.payload.memory.regions[fd_num].mmap_offset = reg->userspace_addr -
- (uintptr_t) memory_region_get_ram_ptr(mr);
+ msg.payload.memory.regions[fd_num].mmap_offset = offset;
assert(fd_num < VHOST_MEMORY_MAX_NREGIONS);
fds[fd_num++] = fd;
}
@@ -617,14 +615,14 @@ static bool vhost_user_can_merge(struct vhost_dev *dev,
uint64_t start1, uint64_t size1,
uint64_t start2, uint64_t size2)
{
- ram_addr_t ram_addr;
+ ram_addr_t offset;
int mfd, rfd;
MemoryRegion *mr;
- mr = qemu_ram_addr_from_host((void *)(uintptr_t)start1, &ram_addr);
+ mr = memory_region_from_host((void *)(uintptr_t)start1, &offset);
mfd = memory_region_get_fd(mr);
- mr = qemu_ram_addr_from_host((void *)(uintptr_t)start2, &ram_addr);
+ mr = memory_region_from_host((void *)(uintptr_t)start2, &offset);
rfd = memory_region_get_fd(mr);
return mfd == rfd;
@@ -57,7 +57,7 @@ typedef uint32_t CPUReadMemoryFunc(void *opaque, hwaddr addr);
void qemu_ram_remap(ram_addr_t addr, ram_addr_t length);
/* This should not be used by devices. */
-MemoryRegion *qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr);
+ram_addr_t qemu_ram_addr_from_host(void *ptr);
RAMBlock *qemu_ram_block_by_name(const char *name);
RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
ram_addr_t *offset);
@@ -32,6 +32,8 @@
#include "qom/object.h"
#include "qemu/rcu.h"
+#define RAM_ADDR_INVALID (~(ram_addr_t)0)
+
#define MAX_PHYS_ADDR_SPACE_BITS 62
#define MAX_PHYS_ADDR (((hwaddr)1 << MAX_PHYS_ADDR_SPACE_BITS) - 1)
@@ -678,6 +680,24 @@ int memory_region_get_fd(MemoryRegion *mr);
void memory_region_set_fd(MemoryRegion *mr, int fd);
/**
+ * memory_region_from_host: Convert a pointer into a RAM memory region
+ * and an offset within it.
+ *
+ * Given a host pointer inside a RAM memory region (created with
+ * memory_region_init_ram() or memory_region_init_ram_ptr()), return
+ * the MemoryRegion and the offset within it.
+ *
+ * Use with care; by the time this function returns, the returned pointer is
+ * not protected by RCU anymore. If the caller is not within an RCU critical
+ * section and does not hold the iothread lock, it must have other means of
+ * protecting the pointer, such as a reference to the region that includes
+ * the incoming ram_addr_t.
+ *
+ * @mr: the memory region being queried.
+ */
+MemoryRegion *memory_region_from_host(void *ptr, ram_addr_t *offset);
+
+/**
* memory_region_get_ram_ptr: Get a pointer into a RAM memory region.
*
* Returns a host pointer to a RAM memory region (created with
@@ -33,8 +33,6 @@
//#define DEBUG_UNASSIGNED
-#define RAM_ADDR_INVALID (~(ram_addr_t)0)
-
static unsigned memory_region_transaction_depth;
static bool memory_region_update_pending;
static bool ioeventfd_update_pending;
@@ -1665,6 +1663,18 @@ void *memory_region_get_ram_ptr(MemoryRegion *mr)
return ptr + offset;
}
+MemoryRegion *memory_region_from_host(void *ptr, ram_addr_t *offset)
+{
+ RAMBlock *block;
+
+ block = qemu_ram_block_from_host(ptr, false, offset);
+ if (!block) {
+ return NULL;
+ }
+
+ return block->mr;
+}
+
ram_addr_t memory_region_get_ram_addr(MemoryRegion *mr)
{
return mr->ram_block ? mr->ram_block->offset : RAM_ADDR_INVALID;
@@ -411,7 +411,8 @@ int kvm_arch_on_sigbus_vcpu(CPUState *c, int code, void *addr)
if ((env->mcg_cap & MCG_SER_P) && addr
&& (code == BUS_MCEERR_AR || code == BUS_MCEERR_AO)) {
- if (qemu_ram_addr_from_host(addr, &ram_addr) == NULL ||
+ ram_addr = qemu_ram_addr_from_host(addr);
+ if (ram_addr == RAM_ADDR_INVALID ||
!kvm_physical_memory_addr_from_host(c->kvm_state, addr, &paddr)) {
fprintf(stderr, "Hardware memory error for memory used by "
"QEMU itself instead of guest system!\n");
@@ -445,7 +446,8 @@ int kvm_arch_on_sigbus(int code, void *addr)
hwaddr paddr;
/* Hope we are lucky for AO MCE */
- if (qemu_ram_addr_from_host(addr, &ram_addr) == NULL ||
+ ram_addr = qemu_ram_addr_from_host(addr);
+ if (ram_addr == RAM_ADDR_INVALID ||
!kvm_physical_memory_addr_from_host(first_cpu->kvm_state,
addr, &paddr)) {
fprintf(stderr, "Hardware memory error for memory used by "
Move the old qemu_ram_addr_from_host to memory_region_from_host and make it return an offset within the region. For qemu_ram_addr_from_host return the ram_addr_t directly, similar to what it was before commit 1b5ec23 ("memory: return MemoryRegion from qemu_ram_addr_from_host", 2013-07-04). Reviewed-by: Marc-André Lureau <marcandre.lureau@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> --- cputlb.c | 3 ++- exec.c | 10 +++++----- hw/virtio/vhost-user.c | 16 +++++++--------- include/exec/cpu-common.h | 2 +- include/exec/memory.h | 20 ++++++++++++++++++++ memory.c | 14 ++++++++++++-- target-i386/kvm.c | 6 ++++-- 7 files changed, 51 insertions(+), 20 deletions(-)