From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 65561] KVM:Entry failed on Single stepping sti instruction
Date: Wed, 21 May 2014 07:13:42 +0000
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--- Comment #7 from Paolo Bonzini ---
Hi Jidong, no this is not fixed yet. Basically OUT instructions are emulated
by KVM, and support for single-stepping and breakpoints in the emulator is
quite minimal.
3.12 added some support but OUTs and writes to memory are still broken:
commit 0912c9771e9902f752e890e93af495cc06a786ac
Author: Paolo Bonzini
Date: Tue Aug 27 15:41:43 2013 +0200
KVM: x86: add comments where MMIO does not return to the emulator
Support for single-step in the emulator (new in 3.12) does not work for
MMIO or PIO writes, because they are completed without returning to
the emulator. This is not worse than what we had in 3.11; still, add
comments so that the issue is not forgotten.
Signed-off-by: Paolo Bonzini
Signed-off-by: Gleb Natapov
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