apfs/linux-apfs
0
0
Fork 0
mirror of https://github.com/linux-apfs/linux-apfs.git synced 2026-05-01 15:00:59 -07:00
Code Issues Packages Projects Releases Wiki Activity

lguest: assume Switcher text is a single page.

Browse Source 
ie. SHARED_SWITCHER_PAGES == 1.  It is well under a page, and it's a
minor simplification: it's nice to have *one* simplification in a
patch series!

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2013-04-22 14:10:38 +09:30
parent 856c608827
commit 93a2cdff98
5 changed files with 21 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/lguest/page_tables.c
+8 -13
View File
@@ -1079,25 +1079,20 @@ static void free_switcher_pte_pages(void)
/*H:520
* Setting up the Switcher PTE page for given CPU is fairly easy, given
* the CPU number and the "struct page"s for the Switcher code itself.
*
* Currently the Switcher is less than a page long, so "pages" is always 1.
* the CPU number and the "struct page"s for the Switcher and per-cpu pages.
*/
static __init void populate_switcher_pte_page(unsigned int cpu,
struct page *switcher_pages[],
unsigned int pages)
struct page *switcher_pages[])
{
unsigned int i;
pte_t *pte = switcher_pte_page(cpu);
int i;
/* The first entries are easy: they map the Switcher code. */
for (i = 0; i < pages; i++) {
set_pte(&pte[i], mk_pte(switcher_pages[i],
/* The first entries maps the Switcher code. */
set_pte(&pte[0], mk_pte(switcher_pages[0],
__pgprot(_PAGE_PRESENT|_PAGE_ACCESSED)));
}
/* The only other thing we map is this CPU's pair of pages. */
i = pages + cpu*2;
i = 1 + cpu*2;
/* First page (Guest registers) is writable from the Guest */
set_pte(&pte[i], pfn_pte(page_to_pfn(switcher_pages[i]),
@@ -1128,7 +1123,7 @@ static __init void populate_switcher_pte_page(unsigned int cpu,
* At boot or module load time, init_pagetables() allocates and populates
* the Switcher PTE page for each CPU.
*/
__init int init_pagetables(struct page **switcher_pages, unsigned int pages)
__init int init_pagetables(struct page **switcher_pages)
{
unsigned int i;
@@ -1138,7 +1133,7 @@ __init int init_pagetables(struct page **switcher_pages, unsigned int pages)
free_switcher_pte_pages();
return -ENOMEM;
}
populate_switcher_pte_page(i, switcher_pages, pages);
populate_switcher_pte_page(i, switcher_pages);
}
return 0;
}