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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] xen: re-define assign_pages and introduce a new function assign_page
commit 5260e8fb93f0e1f094de4142b2abad45844ab89c
Author: Penny Zheng <penny.zheng@xxxxxxx>
AuthorDate: Fri Sep 10 02:52:13 2021 +0000
Commit: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
CommitDate: Mon Sep 13 14:12:59 2021 -0700
xen: re-define assign_pages and introduce a new function assign_page
In order to deal with the trouble of count-to-order conversion when page
number
is not in a power-of-two, this commit re-define assign_pages for nr pages
and
assign_page for original page with a single order.
Backporting confusion could be helped by altering the order of assign_pages
parameters, such that the compiler would point out that adjustments at call
sites are needed.
[stefano: switch to unsigned int for nr]
Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
---
xen/arch/x86/pv/dom0_build.c | 2 +-
xen/common/grant_table.c | 2 +-
xen/common/memory.c | 6 +++---
xen/common/page_alloc.c | 23 ++++++++++++++---------
xen/include/xen/mm.h | 6 ++++++
5 files changed, 25 insertions(+), 14 deletions(-)
diff --git a/xen/arch/x86/pv/dom0_build.c b/xen/arch/x86/pv/dom0_build.c
index d7f9e04b28..77efd3918c 100644
--- a/xen/arch/x86/pv/dom0_build.c
+++ b/xen/arch/x86/pv/dom0_build.c
@@ -568,7 +568,7 @@ int __init dom0_construct_pv(struct domain *d,
else
{
while ( count-- )
- if ( assign_pages(d, mfn_to_page(_mfn(mfn++)), 0, 0) )
+ if ( assign_pages(mfn_to_page(_mfn(mfn++)), 1, d, 0) )
BUG();
}
initrd->mod_end = 0;
diff --git a/xen/common/grant_table.c b/xen/common/grant_table.c
index e80f8d044d..fe1fc11b22 100644
--- a/xen/common/grant_table.c
+++ b/xen/common/grant_table.c
@@ -2358,7 +2358,7 @@ gnttab_transfer(
* is respected and speculative execution is blocked accordingly
*/
if ( unlikely(!evaluate_nospec(okay)) ||
- unlikely(assign_pages(e, page, 0, MEMF_no_refcount)) )
+ unlikely(assign_pages(page, 1, e, MEMF_no_refcount)) )
{
bool drop_dom_ref;
diff --git a/xen/common/memory.c b/xen/common/memory.c
index 74babb0bd7..63642278fd 100644
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -728,8 +728,8 @@ static long
memory_exchange(XEN_GUEST_HANDLE_PARAM(xen_memory_exchange_t) arg)
/* Assign each output page to the domain. */
for ( j = 0; (page = page_list_remove_head(&out_chunk_list)); ++j )
{
- if ( assign_pages(d, page, exch.out.extent_order,
- MEMF_no_refcount) )
+ if ( assign_page(page, exch.out.extent_order, d,
+ MEMF_no_refcount) )
{
unsigned long dec_count;
bool_t drop_dom_ref;
@@ -797,7 +797,7 @@ static long
memory_exchange(XEN_GUEST_HANDLE_PARAM(xen_memory_exchange_t) arg)
* cleared PGC_allocated.
*/
while ( (page = page_list_remove_head(&in_chunk_list)) )
- if ( assign_pages(d, page, 0, MEMF_no_refcount) )
+ if ( assign_pages(page, 1, d, MEMF_no_refcount) )
{
BUG_ON(!d->is_dying);
free_domheap_page(page);
diff --git a/xen/common/page_alloc.c b/xen/common/page_alloc.c
index ba7adc80db..14ba89428b 100644
--- a/xen/common/page_alloc.c
+++ b/xen/common/page_alloc.c
@@ -2259,9 +2259,9 @@ void init_domheap_pages(paddr_t ps, paddr_t pe)
int assign_pages(
- struct domain *d,
struct page_info *pg,
- unsigned int order,
+ unsigned int nr,
+ struct domain *d,
unsigned int memflags)
{
int rc = 0;
@@ -2281,7 +2281,7 @@ int assign_pages(
{
unsigned int extra_pages = 0;
- for ( i = 0; i < (1ul << order); i++ )
+ for ( i = 0; i < nr; i++ )
{
ASSERT(!(pg[i].count_info & ~PGC_extra));
if ( pg[i].count_info & PGC_extra )
@@ -2290,18 +2290,18 @@ int assign_pages(
ASSERT(!extra_pages ||
((memflags & MEMF_no_refcount) &&
- extra_pages == 1u << order));
+ extra_pages == nr));
}
#endif
if ( pg[0].count_info & PGC_extra )
{
- d->extra_pages += 1u << order;
+ d->extra_pages += nr;
memflags &= ~MEMF_no_refcount;
}
else if ( !(memflags & MEMF_no_refcount) )
{
- unsigned int tot_pages = domain_tot_pages(d) + (1 << order);
+ unsigned int tot_pages = domain_tot_pages(d) + nr;
if ( unlikely(tot_pages > d->max_pages) )
{
@@ -2313,10 +2313,10 @@ int assign_pages(
}
if ( !(memflags & MEMF_no_refcount) &&
- unlikely(domain_adjust_tot_pages(d, 1 << order) == (1 << order)) )
+ unlikely(domain_adjust_tot_pages(d, nr) == nr) )
get_knownalive_domain(d);
- for ( i = 0; i < (1 << order); i++ )
+ for ( i = 0; i < nr; i++ )
{
ASSERT(page_get_owner(&pg[i]) == NULL);
page_set_owner(&pg[i], d);
@@ -2331,6 +2331,11 @@ int assign_pages(
return rc;
}
+int assign_page(struct page_info *pg, unsigned int order, struct domain *d,
+ unsigned int memflags)
+{
+ return assign_pages(pg, 1UL << order, d, memflags);
+}
struct page_info *alloc_domheap_pages(
struct domain *d, unsigned int order, unsigned int memflags)
@@ -2373,7 +2378,7 @@ struct page_info *alloc_domheap_pages(
pg[i].count_info = PGC_extra;
}
}
- if ( assign_pages(d, pg, order, memflags) )
+ if ( assign_page(pg, order, d, memflags) )
{
free_heap_pages(pg, order, memflags & MEMF_no_scrub);
return NULL;
diff --git a/xen/include/xen/mm.h b/xen/include/xen/mm.h
index 8e8fb5a615..2b7c5d580c 100644
--- a/xen/include/xen/mm.h
+++ b/xen/include/xen/mm.h
@@ -132,9 +132,15 @@ int query_page_offline(mfn_t mfn, uint32_t *status);
void heap_init_late(void);
int assign_pages(
+ struct page_info *pg,
+ unsigned int nr,
struct domain *d,
+ unsigned int memflags);
+
+int assign_page(
struct page_info *pg,
unsigned int order,
+ struct domain *d,
unsigned int memflags);
/* Dump info to serial console */
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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