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-rw-r--r--tools/lguest/lguest.c28
1 files changed, 23 insertions, 5 deletions
diff --git a/tools/lguest/lguest.c b/tools/lguest/lguest.c
index 02f353989e6c..35d7aa90aa24 100644
--- a/tools/lguest/lguest.c
+++ b/tools/lguest/lguest.c
@@ -92,7 +92,7 @@ static bool verbose;
/* The pointer to the start of guest memory. */
static void *guest_base;
/* The maximum guest physical address allowed, and maximum possible. */
-static unsigned long guest_limit, guest_max;
+static unsigned long guest_limit, guest_max, guest_mmio;
/* The /dev/lguest file descriptor. */
static int lguest_fd;
@@ -321,6 +321,23 @@ static void *get_pages(unsigned int num)
return addr;
}
+/* Get some bytes which won't be mapped into the guest. */
+static unsigned long get_mmio_region(size_t size)
+{
+ unsigned long addr = guest_mmio;
+ size_t i;
+
+ if (!size)
+ return addr;
+
+ /* Size has to be a power of 2 (and multiple of 16) */
+ for (i = 1; i < size; i <<= 1);
+
+ guest_mmio += i;
+
+ return addr;
+}
+
/*
* This routine is used to load the kernel or initrd. It tries mmap, but if
* that fails (Plan 9's kernel file isn't nicely aligned on page boundaries),
@@ -549,9 +566,10 @@ static void tell_kernel(unsigned long start)
unsigned long args[] = { LHREQ_INITIALIZE,
(unsigned long)guest_base,
guest_limit / getpagesize(), start,
- guest_limit / getpagesize() };
- verbose("Guest: %p - %p (%#lx)\n",
- guest_base, guest_base + guest_limit, guest_limit);
+ (guest_mmio+getpagesize()-1) / getpagesize() };
+ verbose("Guest: %p - %p (%#lx, MMIO %#lx)\n",
+ guest_base, guest_base + guest_limit,
+ guest_limit, guest_mmio);
lguest_fd = open_or_die("/dev/lguest", O_RDWR);
if (write(lguest_fd, args, sizeof(args)) < 0)
err(1, "Writing to /dev/lguest");
@@ -2079,7 +2097,7 @@ int main(int argc, char *argv[])
guest_base = map_zeroed_pages(mem / getpagesize()
+ DEVICE_PAGES);
guest_limit = mem;
- guest_max = mem + DEVICE_PAGES*getpagesize();
+ guest_max = guest_mmio = mem + DEVICE_PAGES*getpagesize();
devices.descpage = get_pages(1);
break;
}