summaryrefslogtreecommitdiff
path: root/drivers/lguest
diff options
context:
space:
mode:
authorRusty Russell <rusty@rustcorp.com.au>2013-04-22 14:10:37 +0930
committerRusty Russell <rusty@rustcorp.com.au>2013-04-22 15:31:33 +0930
commit406a590ba105bfb7b67952f0a5f948e0d374e03e (patch)
tree97fbf193d865ff2fa1b1ab209589c1d456f89fa5 /drivers/lguest
parent74ff582cd65ad01c45f1971feac28f23b7eb2687 (diff)
downloadkernel-406a590ba105bfb7b67952f0a5f948e0d374e03e.tar.gz
lguest: prepare to make SWITCHER_ADDR a variable.
We currently use the whole top PGD entry for the switcher, but that's hitting the fixmap in some configurations (mainly, large NR_CPUS). Introduce a variable, currently set to the constant. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/lguest')
-rw-r--r--drivers/lguest/core.c18
-rw-r--r--drivers/lguest/x86/core.c4
2 files changed, 12 insertions, 10 deletions
diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c
index a5ebc0083d87..099252301132 100644
--- a/drivers/lguest/core.c
+++ b/drivers/lguest/core.c
@@ -20,7 +20,7 @@
#include <asm/asm-offsets.h>
#include "lg.h"
-
+unsigned long switcher_addr;
static struct vm_struct *switcher_vma;
static struct page **switcher_page;
@@ -75,25 +75,27 @@ static __init int map_switcher(void)
}
}
+ switcher_addr = SWITCHER_ADDR;
+
/*
* First we check that the Switcher won't overlap the fixmap area at
* the top of memory. It's currently nowhere near, but it could have
* very strange effects if it ever happened.
*/
- if (SWITCHER_ADDR + (TOTAL_SWITCHER_PAGES+1)*PAGE_SIZE > FIXADDR_START){
+ if (switcher_addr + (TOTAL_SWITCHER_PAGES+1)*PAGE_SIZE > FIXADDR_START){
err = -ENOMEM;
printk("lguest: mapping switcher would thwack fixmap\n");
goto free_pages;
}
/*
- * Now we reserve the "virtual memory area" we want: 0xFFC00000
- * (SWITCHER_ADDR). We might not get it in theory, but in practice
- * it's worked so far. The end address needs +1 because __get_vm_area
- * allocates an extra guard page, so we need space for that.
+ * Now we reserve the "virtual memory area" we want. We might
+ * not get it in theory, but in practice it's worked so far.
+ * The end address needs +1 because __get_vm_area allocates an
+ * extra guard page, so we need space for that.
*/
switcher_vma = __get_vm_area(TOTAL_SWITCHER_PAGES * PAGE_SIZE,
- VM_ALLOC, SWITCHER_ADDR, SWITCHER_ADDR
+ VM_ALLOC, switcher_addr, switcher_addr
+ (TOTAL_SWITCHER_PAGES+1) * PAGE_SIZE);
if (!switcher_vma) {
err = -ENOMEM;
@@ -103,7 +105,7 @@ static __init int map_switcher(void)
/*
* This code actually sets up the pages we've allocated to appear at
- * SWITCHER_ADDR. map_vm_area() takes the vma we allocated above, the
+ * switcher_addr. map_vm_area() takes the vma we allocated above, the
* kind of pages we're mapping (kernel pages), and a pointer to our
* array of struct pages. It increments that pointer, but we don't
* care.
diff --git a/drivers/lguest/x86/core.c b/drivers/lguest/x86/core.c
index 4af12e1844d5..20fae765d600 100644
--- a/drivers/lguest/x86/core.c
+++ b/drivers/lguest/x86/core.c
@@ -59,14 +59,14 @@ static struct {
/* Offset from where switcher.S was compiled to where we've copied it */
static unsigned long switcher_offset(void)
{
- return SWITCHER_ADDR - (unsigned long)start_switcher_text;
+ return switcher_addr - (unsigned long)start_switcher_text;
}
/* This cpu's struct lguest_pages. */
static struct lguest_pages *lguest_pages(unsigned int cpu)
{
return &(((struct lguest_pages *)
- (SWITCHER_ADDR + SHARED_SWITCHER_PAGES*PAGE_SIZE))[cpu]);
+ (switcher_addr + SHARED_SWITCHER_PAGES*PAGE_SIZE))[cpu]);
}
static DEFINE_PER_CPU(struct lg_cpu *, lg_last_cpu);