Bug 6779 - PIN memory outside CMA memory for CSV/CSV2 guest
Summary: PIN memory outside CMA memory for CSV/CSV2 guest
Status: NEW
Alias: None
Product: ANCK 5.10 Dev
Classification: ANCK
Component: X86 (show other bugs) X86
Version: unspecified
Hardware: All Linux
: P3-Medium S3-normal
Target Milestone: ---
Assignee: Guanjun
QA Contact: shuming
URL:
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Reported: 2023-10-11 17:40 UTC by jiangxin00
Modified: 2023-10-12 09:32 UTC (History)
2 users (show)

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Description jiangxin00 hygon_group 2023-10-11 17:40:57 UTC 
Description of problem:

When pin_user_pages_fast pin SEV guest memory without FOLL_LONGTERM
flag, the pinning pages may be in CMA area, which resulting in other
applications may can't use the CMA area because the pinning pages
can't be migrated.

Add FOLL_LONGTERM flag to pin_user_pages_fast, which makes sure that we
don't keep non_movable pages (due to page reference count) in CMA area.
So CMA area can be allocated by other applications.

Version-Release number of selected component (if applicable):


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Additional info:
Comment 1 小龙 admin 2023-10-12 09:32:13 UTC 
The PR Link: https://gitee.com/anolis/cloud-kernel/pulls/2280