From: Jan Kiszka <jan.kiszka@web.de>
Date: Sun, 18 Oct 2009 11:24:44 +0000 (+0200)
Subject: KVM: x86: Fix guest single-stepping while interruptible
X-Git-Tag: v2.6.33-rc1~387^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=94fe45da48f921d01d8ff02a0ad54ee9c326d7f0;p=pandora-kernel.git

KVM: x86: Fix guest single-stepping while interruptible

Commit 705c5323 opened the doors of hell by unconditionally injecting
single-step flags as long as guest_debug signaled this. This doesn't
work when the guest branches into some interrupt or exception handler
and triggers a vmexit with flag reloading.

Fix it by saving cs:rip when user space requests single-stepping and
restricting the trace flag injection to this guest code position.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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