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[PATCH 0/2] xen/x86: alternative fix for XSA-369
- To: <linux-kernel@xxxxxxxxxxxxxxx>
- From: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Date: Wed, 17 Mar 2021 12:03:59 +0100
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- Cc: Roger Pau Monne <roger.pau@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 17 Mar 2021 11:05:54 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hello,
This is a proposal for an alternative fix for XSA-369 that instead of
special casing XEN_UNPOPULATED_ALLOC to size the p2m relies on making
XEN_BALLOON_MEMORY_HOTPLUG_LIMIT depend on the generic MEMORY_HOTPLUG
option rather than XEN_BALLOON_MEMORY_HOTPLUG.
I think this is safer, as we don't want to be special casing any option
that pulls in generic MEMORY_HOTPLUG without XEN_BALLOON_MEMORY_HOTPLUG.
Without this we would also need to at least special case ZONE_DEVICE
which also relies on MEMORY_HOTPLUG, and is what pulls the generic
MEMORY_HOTPLUG option even when XEN_BALLOON_MEMORY_HOTPLUG is disabled
with XEN_UNPOPULATED_ALLOC.
Thanks, Roger.
Roger Pau Monne (2):
xen/x86: make XEN_BALLOON_MEMORY_HOTPLUG_LIMIT depend on
MEMORY_HOTPLUG
Revert "xen: fix p2m size in dom0 for disabled memory hotplug case"
arch/x86/include/asm/xen/page.h | 12 ------------
arch/x86/xen/p2m.c | 7 ++-----
arch/x86/xen/setup.c | 25 ++++++++++++++++++++++---
drivers/xen/Kconfig | 4 ++--
4 files changed, 26 insertions(+), 22 deletions(-)
--
2.30.1
|
