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xen: don't use page->lru for ZONE_DEVICE memory

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Commit 9e2369c06c ("xen: add helpers to allocate unpopulated
memory") introduced usage of ZONE_DEVICE memory for foreign memory
mappings.

Unfortunately this collides with using page->lru for Xen backend
private page caches.

Fix that by using page->zone_device_data instead.

Cc: <stable@vger.kernel.org> # 5.9
Fixes: 9e2369c06c ("xen: add helpers to allocate unpopulated memory")
Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovksy@oracle.com>
Reviewed-by: Jason Andryuk <jandryuk@gmail.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross
2020-12-07 09:36:14 +01:00
parent ca33479cc7
commit ee32f32335
3 changed files with 73 additions and 16 deletions
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20
drivers/xen/unpopulated-alloc.c
View File

@@ -12,7 +12,7 @@
#include <xen/xen.h>
static DEFINE_MUTEX(list_lock);
static LIST_HEAD(page_list);
static struct page *page_list;
static unsigned int list_count;
static int fill_list(unsigned int nr_pages)
@@ -84,7 +84,8 @@ static int fill_list(unsigned int nr_pages)
struct page *pg = virt_to_page(vaddr + PAGE_SIZE * i);
BUG_ON(!virt_addr_valid(vaddr + PAGE_SIZE * i));
list_add(&pg->lru, &page_list);
pg->zone_device_data = page_list;
page_list = pg;
list_count++;
}
@@ -118,12 +119,10 @@ int xen_alloc_unpopulated_pages(unsigned int nr_pages, struct page **pages)
}
for (i = 0; i < nr_pages; i++) {
struct page *pg = list_first_entry_or_null(&page_list,
struct page,
lru);
struct page *pg = page_list;
BUG_ON(!pg);
list_del(&pg->lru);
page_list = pg->zone_device_data;
list_count--;
pages[i] = pg;
@@ -134,7 +133,8 @@ int xen_alloc_unpopulated_pages(unsigned int nr_pages, struct page **pages)
unsigned int j;
for (j = 0; j <= i; j++) {
list_add(&pages[j]->lru, &page_list);
pages[j]->zone_device_data = page_list;
page_list = pages[j];
list_count++;
}
goto out;
@@ -160,7 +160,8 @@ void xen_free_unpopulated_pages(unsigned int nr_pages, struct page **pages)
mutex_lock(&list_lock);
for (i = 0; i < nr_pages; i++) {
list_add(&pages[i]->lru, &page_list);
pages[i]->zone_device_data = page_list;
page_list = pages[i];
list_count++;
}
mutex_unlock(&list_lock);
@@ -189,7 +190,8 @@ static int __init init(void)
struct page *pg =
pfn_to_page(xen_extra_mem[i].start_pfn + j);
list_add(&pg->lru, &page_list);
pg->zone_device_data = page_list;
page_list = pg;
list_count++;
}
}