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Re: [Xen-devel] vmx_update_guest_cr() losing EXCEPTION_BITMAP setting
| To: | "Byrne, John (HP Labs)" <john.l.byrne@xxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] vmx_update_guest_cr() losing EXCEPTION_BITMAP setting |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Mon, 11 May 2009 07:52:27 +0100 |
| Cc: | |
| Delivery-date: | Sun, 10 May 2009 23:53:00 -0700 |
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| Thread-index: | AcnR8XOAYOeTv7J5Qqms8GGZVbPMcQAE5g3C |
| Thread-topic: | [Xen-devel] vmx_update_guest_cr() losing EXCEPTION_BITMAP setting |
| User-agent: | Microsoft-Entourage/12.17.0.090302 |
On 11/05/2009 05:32, "Byrne, John (HP Labs)" <john.l.byrne@xxxxxx> wrote: > Running a heavily modified xen-unstable changset 19590:f80cf52a4fb6 with > debugger_attached set, I was seeing the debug traps getting lost from the > EXCEPTION_BITMAP in vmx_update_guest_cr() when transitioning from real to > protected mode. In my codebase, I could fix this trivially by clearing the > debug_state_latch and letting vmx_do_resume() reapply the setting. However, > while it looks like a valid issue in the unmodified codebase, I'm not sure. So > maybe someone might test/examine it and decide if it is real and whether some > more complex fix is required? In vmx_update_guest_cr(), where EXCEPTION_BITMAP gets reset after exit from real mode, try setting v->arch.hvm_vcpu.debug_state_latch=0 and raise_softirq(SCHEDULE_SOFTIRQ). -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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