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lguest: expost switcher_pages array (as lg_switcher_pages).

Browse source 
We will need this in page_table.c soon.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2013-04-22 14:10:40 +09:30
parent 17427e08fa
commit f1f394b1c3
2 changed files with 14 additions and 12 deletions
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25
drivers/lguest/core.c
View file

@ -21,8 +21,8 @@
#include "lg.h"
unsigned long switcher_addr;
struct page **lg_switcher_pages;
static struct vm_struct *switcher_vma;
static struct page **switcher_pages;
/* This One Big lock protects all inter-guest data structures. */
DEFINE_MUTEX(lguest_lock);
@ -63,9 +63,10 @@ static __init int map_switcher(void)
* We allocate an array of struct page pointers. map_vm_area() wants
* this, rather than just an array of pages.
*/
switcher_pages = kmalloc(sizeof(switcher_pages[0])*TOTAL_SWITCHER_PAGES,
GFP_KERNEL);
if (!switcher_pages) {
lg_switcher_pages = kmalloc(sizeof(lg_switcher_pages[0])
* TOTAL_SWITCHER_PAGES,
GFP_KERNEL);
if (!lg_switcher_pages) {
err = -ENOMEM;
goto out;
}
@ -75,8 +76,8 @@ static __init int map_switcher(void)
* so we make sure they're zeroed.
*/
for (i = 0; i < TOTAL_SWITCHER_PAGES; i++) {
switcher_pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
if (!switcher_pages[i]) {
lg_switcher_pages[i] = alloc_page(GFP_KERNEL|__GFP_ZERO);
if (!lg_switcher_pages[i]) {
err = -ENOMEM;
goto free_some_pages;
}
@ -117,7 +118,7 @@ static __init int map_switcher(void)
* array of struct pages. It increments that pointer, but we don't
* care.
*/
pagep = switcher_pages;
pagep = lg_switcher_pages;
err = map_vm_area(switcher_vma, PAGE_KERNEL_EXEC, &pagep);
if (err) {
printk("lguest: map_vm_area failed: %i\n", err);
@ -142,8 +143,8 @@ free_pages:
i = TOTAL_SWITCHER_PAGES;
free_some_pages:
for (--i; i >= 0; i--)
__free_pages(switcher_pages[i], 0);
kfree(switcher_pages);
__free_pages(lg_switcher_pages[i], 0);
kfree(lg_switcher_pages);
out:
return err;
}
@ -158,8 +159,8 @@ static void unmap_switcher(void)
vunmap(switcher_vma->addr);
/* Now we just need to free the pages we copied the switcher into */
for (i = 0; i < TOTAL_SWITCHER_PAGES; i++)
__free_pages(switcher_pages[i], 0);
kfree(switcher_pages);
__free_pages(lg_switcher_pages[i], 0);
kfree(lg_switcher_pages);
}
/*H:032
@ -333,7 +334,7 @@ static int __init init(void)
goto out;
/* Now we set up the pagetable implementation for the Guests. */
err = init_pagetables(switcher_pages);
err = init_pagetables(lg_switcher_pages);
if (err)
goto unmap;

1
drivers/lguest/lg.h
View file

@ -124,6 +124,7 @@ bool lguest_address_ok(const struct lguest *lg,
unsigned long addr, unsigned long len);
void __lgread(struct lg_cpu *, void *, unsigned long, unsigned);
void __lgwrite(struct lg_cpu *, unsigned long, const void *, unsigned);
extern struct page **lg_switcher_pages;
/*H:035
* Using memory-copy operations like that is usually inconvient, so we