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[RFC PATCH 0/1] Runstate error with KPTI
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Bertrand Marquis <bertrand.marquis@xxxxxxx>
- Date: Thu, 28 May 2020 16:25:30 +0100
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The following patch implements a solution to the bug occuring on Arm
with Linux with KPTI enabled during a context switch from user mode:
(XEN) p2m.c:1890: d1v0: Failed to walk page-table va 0xffffff837ebe0cd0
This is an answer to the discussion started here:
https://lists.xenproject.org/archives/html/xen-devel/2020-05/msg00735.html
and a modification of the patches submitted here:
https://lists.xenproject.org/archives/html/xen-devel/2019-05/msg02320.html
This is submitted as an RFC as the solution is only working on Arm and I
would need some help for the x86 implementation.
On x86 this needs at least a solution to implement an equivalent of
get_page_from_gva (see #error in domain.c) and implementation of the
different runstate_update functions.
Any help or suggestion on that would be nice.
I also added some XXX in different places as part of the code of the
original patch I started from are not completely clear to me.
Bertrand Marquis (1):
xen: Use a global mapping for runstate
xen/arch/arm/domain.c | 32 +++++++++-------
xen/arch/x86/domain.c | 51 ++++++++++++++-----------
xen/common/domain.c | 84 ++++++++++++++++++++++++++++++++++-------
xen/include/xen/sched.h | 11 ++++--
4 files changed, 124 insertions(+), 54 deletions(-)
--
2.17.1
|
