KVM: x86: Fix guest single-stepping while interruptible

Browse source

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>

...

This commit is contained in:

Jan Kiszka 2009-10-18 13:24:44 +02:00 • committed by Avi Kivity

parent ffde22ac53

commit 94fe45da48

2 changed files with 32 additions and 19 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

4

arch/x86/include/asm/kvm_host.h

View file

47

arch/x86/kvm/x86.c

View file