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add rollback when ihk_mc_pt_set_page returns error

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This commit is contained in:
Tomoki Shirasawa
2013-06-02 13:54:38 +09:00
parent 54798253c5
commit 5d9efa7241
3 changed files with 34 additions and 5 deletions
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5
arch/x86/kernel/memory.c
View File

@ -621,6 +621,11 @@ int ihk_mc_pt_clear_page(page_table_t pt, void *virt)
return __clear_pt_page(pt, virt, 0);
}
int ihk_mc_pt_clear_large_page(page_table_t pt, void *virt)
{
return __clear_pt_page(pt, virt, 1);
}
void load_page_table(struct page_table *pt)
{
unsigned long pt_addr;

33
kernel/process.c
View File

@ -112,7 +112,7 @@ static int update_process_page_table(struct process *process,
struct vm_range *range, enum ihk_mc_pt_attribute flag)
{
unsigned long p, pa = range->phys;
unsigned long pp;
unsigned long flags = ihk_mc_spinlock_lock(&process->vm->page_table_lock);
p = range->start;
while (p < range->end) {
@ -125,8 +125,7 @@ static int update_process_page_table(struct process *process,
if (ihk_mc_pt_set_large_page(process->vm->page_table, (void *)p,
pa, PTATTR_WRITABLE | PTATTR_USER | flag) != 0) {
kprintf("ERROR:setting large page for 0x%lX -> 0x%lX\n", p, pa);
panic("");
goto err;
}
dkprintf("large page set for 0x%lX -> 0x%lX\n", p, pa);
@ -138,8 +137,7 @@ static int update_process_page_table(struct process *process,
#endif
if(ihk_mc_pt_set_page(process->vm->page_table, (void *)p,
pa, PTATTR_WRITABLE | PTATTR_USER | flag) != 0){
ihk_mc_spinlock_unlock(&process->vm->page_table_lock, flags);
return -ENOMEM;
goto err;
}
pa += PAGE_SIZE;
@ -150,6 +148,31 @@ static int update_process_page_table(struct process *process,
}
ihk_mc_spinlock_unlock(&process->vm->page_table_lock, flags);
return 0;
err:
pp = range->start;
pa = range->phys;
while(pp < p){
#ifdef USE_LARGE_PAGES
if ((p & (LARGE_PAGE_SIZE - 1)) == 0 &&
(pa & (LARGE_PAGE_SIZE - 1)) == 0 &&
(range->end - p) >= LARGE_PAGE_SIZE) {
ihk_mc_pt_clear_large_page(process->vm->page_table, (void *)pp);
pa += LARGE_PAGE_SIZE;
pp += LARGE_PAGE_SIZE;
}
else{
#endif
ihk_mc_pt_clear_page(process->vm->page_table, (void *)pp);
pa += PAGE_SIZE;
pp += PAGE_SIZE;
#ifdef USE_LARGE_PAGES
}
#endif
}
ihk_mc_spinlock_unlock(&process->vm->page_table_lock, flags);
return -ENOMEM;
}
#if 0

1
lib/include/ihk/mm.h
View File

@ -91,6 +91,7 @@ int ihk_mc_pt_set_large_page(page_table_t pt, void *virt,
int ihk_mc_pt_change_page(page_table_t pt, void *virt,
enum ihk_mc_pt_attribute);
int ihk_mc_pt_clear_page(page_table_t pt, void *virt);
int ihk_mc_pt_clear_large_page(page_table_t pt, void *virt);
int ihk_mc_pt_prepare_map(page_table_t pt, void *virt, unsigned long size,
enum ihk_mc_pt_prepare_flag);