From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Use qemu_invalidate_entry in cpu_physical_memory_unmap.
Do not lock mapcache entries in qemu_get_ram_ptr if the address falls in
the ramblock with offset == 0. We don't need to do that because the
callers of qemu_get_ram_ptr either try to map an entire block, other
from the main ramblock, or until the end of a page to implement a single
read or write in the main ramblock.
If we don't lock mapcache entries in qemu_get_ram_ptr we don't need to
call qemu_invalidate_entry in qemu_put_ram_ptr anymore because we can
leave with few long lived block mappings requested by devices.
Also move the call to qemu_ram_addr_from_mapcache at the beginning of
qemu_ram_addr_from_host.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
exec.c | 28 ++++++++++------------------
1 files changed, 10 insertions(+), 18 deletions(-)
diff --git a/exec.c b/exec.c
index ff9c174..aebb23b 100644
--- a/exec.c
+++ b/exec.c
@@ -3065,9 +3065,10 @@ void *qemu_get_ram_ptr(ram_addr_t addr)
if (xen_mapcache_enabled()) {
/* We need to check if the requested address is in the RAM
* because we don't want to map the entire memory in QEMU.
+ * In that case just map until the end of the page.
*/
if (block->offset == 0) {
- return qemu_map_cache(addr, 0, 1);
+ return qemu_map_cache(addr, 0, 0);
} else if (block->host == NULL) {
block->host = qemu_map_cache(block->offset, block->length,
1);
}
@@ -3094,9 +3095,10 @@ void *qemu_safe_ram_ptr(ram_addr_t addr)
if (xen_mapcache_enabled()) {
/* We need to check if the requested address is in the RAM
* because we don't want to map the entire memory in QEMU.
+ * In that case just map until the end of the page.
*/
if (block->offset == 0) {
- return qemu_map_cache(addr, 0, 1);
+ return qemu_map_cache(addr, 0, 0);
} else if (block->host == NULL) {
block->host = qemu_map_cache(block->offset, block->length,
1);
}
@@ -3139,10 +3141,6 @@ void *qemu_ram_ptr_length(target_phys_addr_t addr,
target_phys_addr_t *size)
void qemu_put_ram_ptr(void *addr)
{
trace_qemu_put_ram_ptr(addr);
-
- if (xen_mapcache_enabled()) {
- qemu_invalidate_entry(block->host);
- }
}
int qemu_ram_addr_from_host(void *ptr, ram_addr_t *ram_addr)
@@ -3150,6 +3148,11 @@ int qemu_ram_addr_from_host(void *ptr, ram_addr_t
*ram_addr)
RAMBlock *block;
uint8_t *host = ptr;
+ if (xen_mapcache_enabled()) {
+ *ram_addr = qemu_ram_addr_from_mapcache(ptr);
+ return 0;
+ }
+
QLIST_FOREACH(block, &ram_list.blocks, next) {
/* This case append when the block is not mapped. */
if (block->host == NULL) {
@@ -3161,11 +3164,6 @@ int qemu_ram_addr_from_host(void *ptr, ram_addr_t
*ram_addr)
}
}
- if (xen_mapcache_enabled()) {
- *ram_addr = qemu_ram_addr_from_mapcache(ptr);
- return 0;
- }
-
return -1;
}
@@ -4066,13 +4064,7 @@ void cpu_physical_memory_unmap(void *buffer,
target_phys_addr_t len,
}
}
if (xen_mapcache_enabled()) {
- uint8_t *buffer1 = buffer;
- uint8_t *end_buffer = buffer + len;
-
- while (buffer1 < end_buffer) {
- qemu_put_ram_ptr(buffer1);
- buffer1 += TARGET_PAGE_SIZE;
- }
+ qemu_invalidate_entry(buffer);
}
return;
}
--
1.7.2.3
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