linux-kernel - [PATCH 1/2] pvpanic: introduce crashloaded for pvpanic

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200110100634.491936-2-pizhenwei@bytedance.com>
Date:   Fri, 10 Jan 2020 18:06:33 +0800
From:   zhenwei pi <pizhenwei@...edance.com>
To:     pbonzini@...hat.com
Cc:     qemu-devel@...gnu.org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org, libvir-list@...hat.com,
        mprivozn@...hat.com, yelu@...edance.com,
        zhenwei pi <pizhenwei@...edance.com>
Subject: [PATCH 1/2] pvpanic: introduce crashloaded for pvpanic

Add bit 1 for pvpanic. This bit means that guest hits a panic, but
guest wants to handle error by itself. Typical case: Linux guest runs
kdump in panic. It will help us to separate the abnormal reboot from
normal operation.

Signed-off-by: zhenwei pi <pizhenwei@...edance.com>
---
 docs/specs/pvpanic.txt | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/docs/specs/pvpanic.txt b/docs/specs/pvpanic.txt
index c7bbacc778..bdea68a430 100644
--- a/docs/specs/pvpanic.txt
+++ b/docs/specs/pvpanic.txt
@@ -16,8 +16,12 @@ pvpanic exposes a single I/O port, by default 0x505. On read, the bits
 recognized by the device are set. Software should ignore bits it doesn't
 recognize. On write, the bits not recognized by the device are ignored.
 Software should set only bits both itself and the device recognize.
-Currently, only bit 0 is recognized, setting it indicates a guest panic
-has happened.
+
+Bit Definition
+--------------
+bit 0: setting it indicates a guest panic has happened.
+bit 1: named crashloaded. setting it indicates a guest panic and run
+       kexec to handle error by guest itself.
 
 ACPI Interface
 --------------
-- 
2.11.0