linux-kernel - [PATCH v2 0/2] Drivers: hv: balloon: Temporary fixes for ARM64

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Message-Id: <20220325023212.1570049-1-boqun.feng@gmail.com>
Date:   Fri, 25 Mar 2022 10:32:10 +0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     Wei Liu <wei.liu@...nel.org>
Cc:     Vitaly Kuznetsov <vkuznets@...hat.com>,
        linux-hyperv@...r.kernel.org,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        David Hildenbrand <david@...hat.com>,
        linux-kernel@...r.kernel.org, Boqun Feng <boqun.feng@...il.com>
Subject: [PATCH v2 0/2] Drivers: hv: balloon: Temporary fixes for ARM64

v1: https://lore.kernel.org/lkml/20220223131548.2234326-1-boqun.feng@gmail.com/

Changes since v1:

*	Wording changes suggested by Michael Kelley.

Since Hyper-V always uses 4k pages, hv_balloon has some difficulties
working on ARM64 with larger pages[1]. Besides the memory hot add
messages of Hyper-V doesn't have the information of NUMA node id of the
added memory range, and ARM64 currently doesn't provide the conversion
from a physical address to a node id, as a result the hv_balloon driver
couldn't handle hot add properly when there are more than one NUMA node.

Among these issues, post_status() is easy to fix, while the unballoon
issue and the hot-add issue requires more discussion. To make the
hv_balloon driver work at the best effort, this patchset fixes the
post_status() and temporarily disable the balloon and hot-add
accordingly.

Looking forwards to comments and suggestions.

Regards,
Boqun

[1]: https://lore.kernel.org/lkml/20220105165028.1343706-1-vkuznets@redhat.com/

*** BLURB HERE ***

Boqun Feng (2):
  Drivers: hv: balloon: Support status report for larger page sizes
  Drivers: hv: balloon: Disable balloon and hot-add accordingly

 drivers/hv/hv_balloon.c | 49 ++++++++++++++++++++++++++++++++++++-----
 1 file changed, 44 insertions(+), 5 deletions(-)

-- 
2.35.1