From: Peter Dinda <pdinda@northwestern.edu>
Date: Fri, 13 Apr 2012 23:27:24 +0000 (-0500)
Subject: Add ability to write to gvas
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=commitdiff_plain;h=8804b6f5dc0878407aa757d9596a96d774392582;p=palacios.git

Add ability to write to gvas
---

diff --git a/palacios/include/palacios/vm_guest_mem.h b/palacios/include/palacios/vm_guest_mem.h
index db6a6a0..7c0dbcf 100644
--- a/palacios/include/palacios/vm_guest_mem.h
+++ b/palacios/include/palacios/vm_guest_mem.h
@@ -105,10 +105,10 @@ int v3_hva_to_gva(struct guest_info * guest_info, addr_t host_va, addr_t  * gues
 
 
 
-int v3_read_gva_memory(struct guest_info * guest_info, addr_t guest_va, int count, uchar_t * dest);
-int v3_read_gpa_memory(struct guest_info * guest_info, addr_t guest_pa, int count, uchar_t * dest);
-int v3_write_gpa_memory(struct guest_info * guest_info, addr_t guest_pa, int count, uchar_t * src);
-// TODO int write_guest_va_memory(struct guest_info * guest_info, addr_t guest_va, int count, char * src);
+int v3_read_gva_memory(struct guest_info * guest_info, addr_t guest_va, int count, uint8_t * dest);
+int v3_read_gpa_memory(struct guest_info * guest_info, addr_t guest_pa, int count, uint8_t * dest);
+int v3_write_gpa_memory(struct guest_info * guest_info, addr_t guest_pa, int count, uint8_t * src);
+int v3_write_gva_memory(struct guest_info * guest_info, addr_t guest_va, int count, uint8_t * src);
 
 
 #endif // ! __V3VEE__
diff --git a/palacios/src/palacios/vm_guest_mem.c b/palacios/src/palacios/vm_guest_mem.c
index 810be79..d05bd39 100644
--- a/palacios/src/palacios/vm_guest_mem.c
+++ b/palacios/src/palacios/vm_guest_mem.c
@@ -396,6 +396,41 @@ int v3_read_gpa_memory(struct guest_info * guest_info, addr_t gpa, int count, uc
 }
 
 
+/* This clones v3_read_gva_memory
+ *   We write only as far as page translations are available 
+ */
+int v3_write_gva_memory(struct guest_info * guest_info, addr_t gva, int count, uchar_t * src) {
+    addr_t cursor = gva;
+    int bytes_written = 0;
+
+
+
+    while (count > 0) {
+	int dist_to_pg_edge = (PAGE_ADDR(cursor) + PAGE_SIZE) - cursor;
+	int bytes_to_copy = (dist_to_pg_edge > count) ? count : dist_to_pg_edge;
+	addr_t host_addr = 0;
+
+    
+	if (v3_gva_to_hva(guest_info, cursor, &host_addr) != 0) {
+	    PrintDebug("Invalid GVA(%p)->HVA lookup\n", (void *)cursor);
+	    return bytes_written;
+	}
+    
+    
+
+	memcpy((void*)host_addr,
+	       src + bytes_written, 
+	       bytes_to_copy);
+    
+	bytes_written += bytes_to_copy;
+	count -= bytes_to_copy;
+	cursor += bytes_to_copy;    
+    }
+
+    return bytes_written;
+}
+
+
 
 
 /* This is a straight address conversion + copy,