linux-kernel - Re: [PATCH v4 0/4] s390/crash: support multi-segment iterators

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Message-ID: <87edygc75j.fsf@oc8242746057.ibm.com>
Date:   Wed, 20 Jul 2022 14:15:04 +0200
From:   Alexander Egorenkov <egorenar@...ux.ibm.com>
To:     Alexander Gordeev <agordeev@...ux.ibm.com>,
        Matthew Wilcox <willy@...radead.org>,
        Heiko Carstens <hca@...ux.ibm.com>
Cc:     Baoquan He <bhe@...hat.com>, Christoph Hellwig <hch@....de>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH v4 0/4] s390/crash: support multi-segment iterators

HI Alexander,

Alexander Gordeev <agordeev@...ux.ibm.com> writes:

> Hi Matthew et al,
>
> This series completes 5d8de293c224 ("vmcore: convert copy_oldmem_page()
> to take an iov_iter") for s390.
>
> Changes since v3:
>   - concurrent access to HSA and oldmem swap buffers protected;
>
> Changes since v2:
>   - Matthew Wilcox suggestion is adopted, with that...
>   - copy_to_iter() is used instead of custom implementation;
>
> Changes since v1:
>   - number of bytes left to copy on fail fixed;
>
> Thanks!
>
>
> Alexander Gordeev (4):
>   s390/zcore: fix race when reading from hardware system area
>   s390/crash: move copy_to_user_real() to crash_dump.c
>   s390/crash: use static swap buffer for copy_to_user_real()
>   s390/crash: support multi-segment iterators
>
>  arch/s390/include/asm/os_info.h |  17 ++++-
>  arch/s390/include/asm/sclp.h    |   4 +-
>  arch/s390/include/asm/uaccess.h |   1 -
>  arch/s390/kernel/crash_dump.c   | 114 ++++++++------------------------
>  arch/s390/mm/maccess.c          |  26 --------
>  drivers/s390/char/zcore.c       |  55 ++++++++-------
>  6 files changed, 71 insertions(+), 146 deletions(-)
>
> -- 
> 2.34.1

all our kdump + makedumpfile (with CP as core collector as well) work
with these patches applied.

Tested on LPAR and zVM.
With and w/o KASAN.

Tested-by: Alexander Egorenkov <egorenar@...ux.ibm.com>

Regards
Alex