[dpdk-dev] [RFC PATCH 1/7] lib/librte_vhost: Fix host_memory_map() to handle various memory regions

[Tetsuya Mukawa <mukawa@igel.co.jp>]

Without this patch, host_memory_map() can only handle a region that
exists on head of a guest physical memory. The patch fixes the
host_memory_map() to handle regions exist on middle of the physical memory.

Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
---
 lib/librte_vhost/virtio-net.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/librte_vhost/virtio-net.c b/lib/librte_vhost/virtio-net.c
index 8015dd8..9155a68 100644
--- a/lib/librte_vhost/virtio-net.c
+++ b/lib/librte_vhost/virtio-net.c
@@ -83,6 +83,7 @@ const uint32_t BUFSIZE = PATH_MAX;
 /* Structure containing information gathered from maps file. */
 struct procmap {
 	uint64_t	va_start;	/* Start virtual address in file. */
+	uint64_t	va_end;		/* End virtual address in file. */
 	uint64_t	len;		/* Size of file. */
 	uint64_t	pgoff;		/* Not used. */
 	uint32_t	maj;		/* Not used. */
@@ -176,7 +177,7 @@ host_memory_map(struct virtio_net *dev, struct virtio_memory *mem,
 			return -1;
 		}
 
-		procmap.len = strtoull(in[1], &end, 16);
+		procmap.va_end = strtoull(in[1], &end, 16);
 		if ((in[1] == '\0') || (end == NULL) || (*end != '\0') || (errno != 0)) {
 			fclose(fmap);
 			return -1;
@@ -209,8 +210,8 @@ host_memory_map(struct virtio_net *dev, struct virtio_memory *mem,
 		memcpy(&procmap.prot, in[2], PROT_SZ);
 		memcpy(&procmap.fname, in[7], PATH_MAX);
 
-		if (procmap.va_start == addr) {
-			procmap.len = procmap.len - procmap.va_start;
+		if ((procmap.va_start <= addr) && (procmap.va_end >= addr)) {
+			procmap.len = procmap.va_end - procmap.va_start;
 			found = 1;
 			break;
 		}
-- 
1.9.1