From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jan Kiszka <jan.kiszka@web.de>
Subject: Re: [kvm-devel] [RFC][PATCH 2/4] kvm: Arch-specifc KVM_EXIT_DEBUG
 payload
Date: Thu, 22 May 2008 15:27:07 +0200
Message-ID: <483574AB.4000100@web.de>
References: <482D9198.7040801@web.de> <482DAFF6.3050403@web.de> <483446E8.1020605@qumranet.com>
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Cc: kvm-devel <kvm@vger.kernel.org>,
	Hollis Blanchard <hollisb@us.ibm.com>
To: Avi Kivity <avi@qumranet.com>
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Avi Kivity wrote:
> Jan Kiszka wrote:
>> This adds an arch field to kvm_run.debug, the payload that is returned=

>> to user space on KVM_EXIT_DEBUG guest exits. For x86, this field is no=
w
>> supposed to report the precise debug exception (#DB or #BP) and the
>> current state of the debug registers (the latter is not yet
>> implemented).
>>
>> Index: b/include/asm-x86/kvm.h
>> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>> --- a/include/asm-x86/kvm.h
>> +++ b/include/asm-x86/kvm.h
>> @@ -230,4 +230,9 @@ struct kvm_pit_state {
>>  #define KVM_TRC_APIC_ACCESS      (KVM_TRC_HANDLER + 0x14)
>>  #define KVM_TRC_TDP_FAULT        (KVM_TRC_HANDLER + 0x15)
>> =20
>> +struct kvm_debug_exit_arch {
>> +    __u32 exception;
>> +    __u64 dr[8];
>> +};
>> +
>>  =20
>=20
> Need empty structures for non-x86.
>=20
> Need a KVM_CAP_ to indicate presence of this feature.

Have all this in patch already, but need time to finish it, test it, and
roll it out. There are two usability issues I would like to resolve
first (to see if that has impact on the kernel-user interface), see
following posts.

Jan


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