X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Fsrc%2Fdevices%2Fsym_swap.c;h=f2057f40b40ca757aeda9540b9c338ad7a7bd638;hb=1a24d4e8fb3918a42b124777db5b41940150023e;hp=a93b6db0a7c3ac1f64bc4ebcc501e1fa0abadebc;hpb=3087452f105f516ec229af6f4e6a86c80d57424c;p=palacios.git

diff --git a/palacios/src/devices/sym_swap.c b/palacios/src/devices/sym_swap.c
index a93b6db..f2057f4 100644
--- a/palacios/src/devices/sym_swap.c
+++ b/palacios/src/devices/sym_swap.c
@@ -23,14 +23,38 @@
 
 #define SWAP_CAPACITY (150 * 1024 * 1024)
 
+
+/* This is the first page that linux writes to the swap area */
+/* Taken from Linux */
+union swap_header {
+    struct {
+	char reserved[PAGE_SIZE - 10];
+	char magic[10];			/* SWAP-SPACE or SWAPSPACE2 */
+    } magic;
+    struct {
+	char	         	bootbits[1024];	/* Space for disklabel etc. */
+	uint32_t		version;
+	uint32_t		last_page;
+	uint32_t		nr_badpages;
+	unsigned char   	sws_uuid[16];
+	unsigned char	        sws_volume[16];
+	uint32_t                type;           // The index into the swap_map
+	uint32_t		padding[116];
+	//		uint32_t		padding[117];
+	uint32_t		badpages[1];
+    } info;
+};
+
 struct swap_state {
     
     struct vm_device * blk_dev;
 
+    uint_t swapped_pages;
+    uint_t unswapped_pages;
+
     uint64_t capacity;
     uint8_t * swap_space;
     addr_t swap_base_addr;
-
 };
 
 
@@ -50,11 +74,20 @@ static int swap_read(uint8_t * buf, int sector_count, uint64_t lba,  void * priv
     int offset = lba * HD_SECTOR_SIZE;
     int length = sector_count * HD_SECTOR_SIZE;
 
+    
     PrintDebug("SymSwap: Reading %d bytes to %p from %p\n", length,
 	       buf, (void *)(swap->swap_space + offset));
+    
+    if (length % 4096) {
+	PrintError("Swapping in length that is not a page multiple\n");
+    }
 
     memcpy(buf, swap->swap_space + offset, length);
 
+    swap->unswapped_pages += (length / 4096);
+
+    PrintDebug("Swapped in %d pages\n", length / 4096);
+
     return 0;
 }
 
@@ -63,12 +96,34 @@ static int swap_write(uint8_t * buf, int sector_count, uint64_t lba, void * priv
     struct swap_state * swap = (struct swap_state *)(dev->private_data);
     int offset = lba * HD_SECTOR_SIZE;
     int length = sector_count * HD_SECTOR_SIZE;
+    /*
+      PrintDebug("SymSwap: Writing %d bytes to %p from %p\n", length, 
+      (void *)(swap->swap_space + offset), buf);
+    */
+    if (length % 4096) {
+	PrintError("Swapping out length that is not a page multiple\n");
+    }
+
+    if (offset == 0) {
+	// This is the swap header page 
+	union swap_header * hdr;
+	if (length != 4096) {
+	    PrintError("Initializing Swap space by not writing page multiples. This sucks...\n");
+	    return -1;
+	}
+
+	hdr = (union swap_header *)buf;
+	
 
-    PrintDebug("SymSwap: Writing %d bytes to %p from %p\n", length, 
-	       (void *)(swap->swap_space + offset), buf);
+	PrintDebug("Swap Type=%d (magic=%s)\n", hdr->info.type, hdr->magic.magic);
+    }
 
     memcpy(swap->swap_space + offset, buf, length);
 
+    swap->swapped_pages += (length / 4096);
+
+    PrintDebug("Swapped out %d pages\n", length / 4096);
+
     return 0;
 }
 
@@ -117,6 +172,9 @@ static int swap_init(struct guest_info * vm, void * cfg_data) {
     swap->blk_dev = virtio_blk;
     swap->capacity = SWAP_CAPACITY;
 
+    swap->swapped_pages = 0;
+    swap->unswapped_pages = 0;
+
     swap->swap_base_addr = (addr_t)V3_AllocPages(swap->capacity / 4096);
     swap->swap_space = (uint8_t *)V3_VAddr((void *)(swap->swap_base_addr));
     memset(swap->swap_space, 0, SWAP_CAPACITY);