linux-kernel - Re: [PATCH v7 1/3] KVM: x86: export svm/vmx exit code and vector code to userspace

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Date:	Tue, 04 Sep 2012 11:53:24 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Dong Hao <haodong@...ux.vnet.ibm.com>, acme@...radead.org,
	mtosatti@...hat.com, mingo@...e.hu, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Subject: Re: [PATCH v7 1/3] KVM: x86: export svm/vmx exit code and vector
 code to userspace

On 09/03/2012 07:13 PM, Avi Kivity wrote:
> On 08/27/2012 12:51 PM, Dong Hao wrote:
>> From: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
>>
>> Exporting KVM exit information to userspace to be consumed by perf.
>>
>> [ Dong Hao <haodong@...ux.vnet.ibm.com>: rebase it on acme's git tree ]
>> Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
>> Signed-off-by: Dong Hao <haodong@...ux.vnet.ibm.com>
>> ---
>>  arch/x86/include/asm/kvm_host.h |   36 ++++---
> 
> Please put ABIs in kvm.h.  But see below.
> 
>>  arch/x86/include/asm/svm.h      |  205 +++++++++++++++++++++++++--------------
>>  arch/x86/include/asm/vmx.h      |  126 ++++++++++++++++--------
>>  arch/x86/kvm/trace.h            |   89 -----------------
>>  4 files changed, 234 insertions(+), 222 deletions(-)
>>
>>  
>> +#define DE_VECTOR 0
>> +#define DB_VECTOR 1
>> +#define BP_VECTOR 3
>> +#define OF_VECTOR 4
>> +#define BR_VECTOR 5
>> +#define UD_VECTOR 6
>> +#define NM_VECTOR 7
>> +#define DF_VECTOR 8
>> +#define TS_VECTOR 10
>> +#define NP_VECTOR 11
>> +#define SS_VECTOR 12
>> +#define GP_VECTOR 13
>> +#define PF_VECTOR 14
>> +#define MF_VECTOR 16
>> +#define MC_VECTOR 18
> 
> This is not a kvm ABI, but an x86 architecture constants.  It should be
> put into an existing x86 header.

Okay, i will move them into asm/kvm.h

> 
>> +
>>  #endif /* _ASM_X86_KVM_HOST_H */
>> diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
>> index f2b83bc..cdf5674 100644
>> --- a/arch/x86/include/asm/svm.h
>> +++ b/arch/x86/include/asm/svm.h
>> @@ -1,6 +1,135 @@
>>  #ifndef __SVM_H
>>  #define __SVM_H
>>  
>> +
>> +#ifdef __KERNEL__
>> +
> 
> The entire file can be exported; nothing in there is implementation
> specific.

Unfortunately, i have tied this but failed:

../../arch/x86/include/asm/svm.h:262:1: error: packed attribute is unnecessary for ‘vmcb_seg’ [-Werror=packed]
../../arch/x86/include/asm/svm.h:307:1: error: packed attribute is unnecessary for ‘vmcb_save_area’ [-Werror=packed]
../../arch/x86/include/asm/svm.h:312:1: error: packed attribute is unnecessary for ‘vmcb’ [-Werror=packed]
......

> 
>> diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
>> index 74fcb96..61e04e9 100644
>> --- a/arch/x86/include/asm/vmx.h
>> +++ b/arch/x86/include/asm/vmx.h
>> +
>> +#ifdef __KERNEL__
>> +
> 
> Ditto.

Or:

../../arch/x86/include/asm/vmx.h:376:0: error: "REG_R8" redefined [-Werror]
/usr/include/sys/ucontext.h:46:0: note: this is the location of the previous definition
../../arch/x86/include/asm/vmx.h:377:0: error: "REG_R9" redefined [-Werror]
/usr/include/sys/ucontext.h:48:0: note: this is the location of the previous definition
......

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