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[PATCH v1 5/5] xen/arm: no need to store pages in resv_page_list when domain is directly mapped
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Penny Zheng <Penny.Zheng@xxxxxxx>
- Date: Wed, 30 Mar 2022 17:36:17 +0800
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- Cc: <wei.chen@xxxxxxx>, <henry.wang@xxxxxxx>, Penny Zheng <Penny.Zheng@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, "George Dunlap" <george.dunlap@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, "Julien Grall" <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Penny Zheng <penny.zheng@xxxxxxx>
- Delivery-date: Wed, 30 Mar 2022 09:38:25 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Nodisclaimer: true
When domain on static allocation and is directly mapped, in terms of
GPA == HPA(guest physical address == host physical address), we could use
mfn_to_page() to easily find the page, so there is no need to store pages
in resv_page_list.
Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
---
xen/common/memory.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/xen/common/memory.c b/xen/common/memory.c
index 2122ceeba7..2865e09a33 100644
--- a/xen/common/memory.c
+++ b/xen/common/memory.c
@@ -445,8 +445,11 @@ int guest_remove_page(struct domain *d, unsigned long gmfn)
* When domain on static allocation, we shall store pages to
resv_page_list,
* so the hypercall populate_physmap could retrieve pages from it,
* rather than allocating from heap.
+ * No need to store pages in resv_page_list when domain on static
+ * allocation and directly mapped, since we could use mfn_to_page() to
+ * easily find the page.
*/
- if ( is_domain_on_static_allocation(d) )
+ if ( is_domain_on_static_allocation(d) && !is_domain_direct_mapped(d) )
{
page_list_add_tail(page, &d->resv_page_list);
d->resv_pages++;
--
2.25.1
|
