Cache address translation result and use it in next translation. Due
to limited regions are supported, buffers are most likely in same
region when doing data transmission.
Signed-off-by: Marvin Liu <yong....@intel.com>
diff --git a/lib/librte_vhost/rte_vhost.h b/lib/librte_vhost/rte_vhost.h
index 7fb172912..d90235cd6 100644
--- a/lib/librte_vhost/rte_vhost.h
+++ b/lib/librte_vhost/rte_vhost.h
@@ -91,10 +91,18 @@ struct rte_vhost_mem_region {
int fd;
};
+struct rte_vhost_mem_region_cache {
+ uint64_t guest_phys_addr;
+ uint64_t guest_phys_addr_end;
+ int64_t host_user_addr_offset;
+ uint64_t size;
+};
+
/**
* Memory structure includes region and mapping information.
*/
struct rte_vhost_memory {
+ struct rte_vhost_mem_region_cache cache_region;
uint32_t nregions;
struct rte_vhost_mem_region regions[];
};
@@ -232,11 +240,30 @@ rte_vhost_va_from_guest_pa(struct rte_vhost_memory *mem,
struct rte_vhost_mem_region *r;
uint32_t i;
+ struct rte_vhost_mem_region_cache *r_cache;
+ /* check with cached region */
+ r_cache = &mem->cache_region;
+ if (likely(gpa >= r_cache->guest_phys_addr && gpa <
+ r_cache->guest_phys_addr_end)) {
+ if (unlikely(*len > r_cache->guest_phys_addr_end - gpa))
+ *len = r_cache->guest_phys_addr_end - gpa;
+
+ return gpa - r_cache->host_user_addr_offset;
+ }
+
+
for (i = 0; i < mem->nregions; i++) {
r = &mem->regions[i];
if (gpa >= r->guest_phys_addr &&
gpa < r->guest_phys_addr + r->size) {
+ r_cache->guest_phys_addr = r->guest_phys_addr;
+ r_cache->guest_phys_addr_end = r->guest_phys_addr +
+ r->size;
+ r_cache->size = r->size;
+ r_cache->host_user_addr_offset = r->guest_phys_addr -
+ r->host_user_addr;
+
if (unlikely(*len > r->guest_phys_addr + r->size - gpa))
*len = r->guest_phys_addr + r->size - gpa;
--
2.17.1
