how to locate the hypercall address in memory?

how to locate the hypercall address in memory?

[big strong]

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As syscalls can be located with the help of symbol files, is it possible to
do it to hypercalls too?

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Re: how to locate the hypercall address in memory?

[Jan Beulich]

>>> On 14.07.15 at 09:10, <fangtuo90@gmail.com> wrote:
> As syscalls can be located with the help of symbol files, is it possible to
> do it to hypercalls too?

Sure.

Jan

Re: how to locate the hypercall address in memory?

[big strong]

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could you explain that in detail? As syscall tracing, we usually locate the
kernel module first, then find the address of specific syscall function in
that module with the help of symbol files. How could this be applied to
hypercalls then?

2015-07-14 19:56 GMT+08:00 Jan Beulich <JBeulich@suse.com>:

> >>> On 14.07.15 at 09:10, <fangtuo90@gmail.com> wrote:
> > As syscalls can be located with the help of symbol files, is it possible
> to
> > do it to hypercalls too?
>
> Sure.
>
> Jan
>
>

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Re: how to locate the hypercall address in memory?

[Jan Beulich]

>>> On 14.07.15 at 13:59, <fangtuo90@gmail.com> wrote:
> could you explain that in detail? As syscall tracing, we usually locate the
> kernel module first, then find the address of specific syscall function in
> that module with the help of symbol files. How could this be applied to
> hypercalls then?

You'd do whatever you do with the kernel binary with the hypervisor
one instead (plus you don't even need to care about modules there).

Jan

Re: how to locate the hypercall address in memory?

[big strong]

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All right, what is the base address of hypercalls table? And which file
contains the offset of each hypercall?

2015-07-14 20:36 GMT+08:00 Jan Beulich <JBeulich@suse.com>:

> >>> On 14.07.15 at 13:59, <fangtuo90@gmail.com> wrote:
> > could you explain that in detail? As syscall tracing, we usually locate
> the
> > kernel module first, then find the address of specific syscall function
> in
> > that module with the help of symbol files. How could this be applied to
> > hypercalls then?
>
> You'd do whatever you do with the kernel binary with the hypervisor
> one instead (plus you don't even need to care about modules there).
>
> Jan
>
>

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Re: how to locate the hypercall address in memory?

[Jan Beulich]

>>> On 14.07.15 at 15:31, <fangtuo90@gmail.com> wrote:
> All right, what is the base address of hypercalls table? And which file
> contains the offset of each hypercall?

Did you at least _try_ to find the answer yourself, e.g. by
grep-ing the hypervisor source for some obvious strings?

Jan

> 2015-07-14 20:36 GMT+08:00 Jan Beulich <JBeulich@suse.com>:
> 
>> >>> On 14.07.15 at 13:59, <fangtuo90@gmail.com> wrote:
>> > could you explain that in detail? As syscall tracing, we usually locate
>> the
>> > kernel module first, then find the address of specific syscall function
>> in
>> > that module with the help of symbol files. How could this be applied to
>> > hypercalls then?
>>
>> You'd do whatever you do with the kernel binary with the hypervisor
>> one instead (plus you don't even need to care about modules there).
>>
>> Jan
>>
>>

Re: how to locate the hypercall address in memory?

[Ian Campbell]

On Tue, 2015-07-14 at 14:38 +0100, Jan Beulich wrote:
> >>> On 14.07.15 at 15:31, <fangtuo90@gmail.com> wrote:
> > All right, what is the base address of hypercalls table? And which file
> > contains the offset of each hypercall?
> 
> Did you at least _try_ to find the answer yourself, e.g. by
> grep-ing the hypervisor source for some obvious strings?

big strong,

I would recommend that you read
http://wiki.xen.org/wiki/Asking_Xen_Devel_Questions

Ian.

Re: how to locate the hypercall address in memory?

[big strong]

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http://wiki.xen.org/wiki/Asking_Xen_Devel_Questions The page cannot open

2015-07-14 22:02 GMT+08:00 Ian Campbell <ian.campbell@citrix.com>:

> On Tue, 2015-07-14 at 14:38 +0100, Jan Beulich wrote:
> > >>> On 14.07.15 at 15:31, <fangtuo90@gmail.com> wrote:
> > > All right, what is the base address of hypercalls table? And which file
> > > contains the offset of each hypercall?
> >
> > Did you at least _try_ to find the answer yourself, e.g. by
> > grep-ing the hypervisor source for some obvious strings?
>
> big strong,
>
> I would recommend that you read
> http://wiki.xen.org/wiki/Asking_Xen_Devel_Questions
>
> Ian.
>
>
>

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Re: how to locate the hypercall address in memory?

[big strong]

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I've read the hypercall related code, such as entry.S hypervisor.h ,etc.
But the problem is that hypercall functions are implemented in different
files while linux package syscalls into glibc and windows ntoskrnl. There
is a hypercall table defined in entry.S. But I havn't found any offsets
related information. Besides, I've learned that hypercall page is mapped to
a fixed address when the guest is initialized, but which address it is and
is this address the base address of hypercall table?

2015-07-14 21:38 GMT+08:00 Jan Beulich <JBeulich@suse.com>:

> >>> On 14.07.15 at 15:31, <fangtuo90@gmail.com> wrote:
> > All right, what is the base address of hypercalls table? And which file
> > contains the offset of each hypercall?
>
> Did you at least _try_ to find the answer yourself, e.g. by
> grep-ing the hypervisor source for some obvious strings?
>
> Jan
>
> > 2015-07-14 20:36 GMT+08:00 Jan Beulich <JBeulich@suse.com>:
> >
> >> >>> On 14.07.15 at 13:59, <fangtuo90@gmail.com> wrote:
> >> > could you explain that in detail? As syscall tracing, we usually
> locate
> >> the
> >> > kernel module first, then find the address of specific syscall
> function
> >> in
> >> > that module with the help of symbol files. How could this be applied
> to
> >> > hypercalls then?
> >>
> >> You'd do whatever you do with the kernel binary with the hypervisor
> >> one instead (plus you don't even need to care about modules there).
> >>
> >> Jan
> >>
> >>
>
>
>
>

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