Re: Performance problem about address translation

[xinyue <xinyue@nfs.iscas.ac.cn>]

Very sorry for sending wrong before.
On 2015年07月08日 14:13, xinyue wrote:
>
> On 2015年07月07日 19:49, Ian Campbell wrote:
>> On Tue, 2015-07-07 at 11:24 +0800, xinyue wrote:
>>
>> Please don't use HTML mail and do proper ">" quoting
>>
>>> And after analyzing the performance of hvm domu, I found a process
>>> named "evolution-data-" using almost 99.9% cpu. Does someone known
>>> what's this and why it appears?
>> evolution-data-server is part of the evolution mail client. It has
>> nothing to do with Xen I'm afraid so you will have to look elsewhere for
>> why it is taking so much CPU.
>>
>> Ian.
>>
>
Sorry for that and thanks very much.

I think the problem maybe caused by the address alignment. The HVM DomU 
crashed after the hypercall and Dom0 crashed later sometimes with "Bus 
error".

I think the function that caused the crash is get_gfn. The related code is

     unsigned long gfn;
     unsigned long mfn;
     struct vcpu *vcpu = current;
     struct domain *d = vcpu->domain;
     uint32_t pfec = PFEC_page_present;
     p2m_type_t t;
     gfn = paging_gva_to_gfn(current, 0xc0290000, &pfec);
     mfn = get_gfn(d, gfn, &t);

Is that I lost some type translation?


Thanks and best regards!

xinyue

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