From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zeinab Alebouyeh Subject: Re: Grab the physical address of a label Date: Fri, 8 Jun 2012 11:15:29 -0700 Message-ID: References: <1338975815.32319.40.camel@zakaz.uk.xensource.com> <1339050679.6557.21.camel@dagon.hellion.org.uk> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============3350830703301219946==" Return-path: In-Reply-To: <1339050679.6557.21.camel@dagon.hellion.org.uk> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Ian Campbell Cc: "xen-devel@lists.xen.org" List-Id: xen-devel@lists.xenproject.org --===============3350830703301219946== Content-Type: multipart/alternative; boundary=0016e6dedd8c3b6a4704c1f9fc58 --0016e6dedd8c3b6a4704c1f9fc58 Content-Type: text/plain; charset=ISO-8859-1 On Wed, Jun 6, 2012 at 11:31 PM, Ian Campbell wrote: > Please don't top post, it makes it hard to follow the flow of the > conversation. > > You might also find it useful to read > http://wiki.xen.org/wiki/Asking_Xen_Devel_Questions > > On Thu, 2012-06-07 at 05:29 +0100, Zeinab Alebouyeh wrote: > > Thanks but I think if I find the base physical address of xen image I > > can convert virtual address to physical address > > I'm not sure what this has to do with taking the address of a label, > like you originally asked, but... > > There are macros to convert a xenheap virtual address into a physical > one and back, see __pa and __va. (Note that these only work for xenheap > addresses). > > > I'm working in xen4 and my platform is: Processor AMD 64 and Centos 6 > > i386 with 8G of RAM > > Are you using a 32-bit or 64-bit hypervisor? > > I strongly recommend basing all future x86 work on 64-bit Xen, even if > you are using a 32 bit dom0. > > > Can anyone tell me The physical address that xen image load in it? > > This physical address depends on platform? > > Yes, Xen will relocate itself at start of day. You should be able to > figure out the details from the implementation of __pa and __va. > > It might be helpful if you described what you are actually trying to > achieve here -- what is your end goal? > > Ian. > Hi Because currently I'm not in lab I don't know my hypervisor is 32b or 64 bit. I'm working in a security project. for improve security of applications running in virtualized environment. I want to use the security instruction of AMD SVM named SKINIT. because this instruction must run in ring0, I add a hypercall in xen and write my codes in my hypercall function. The skinit instruction takes the physical address of a block as an input operand( in the eax register) and establish a secure execution environment for a software component(block) I have a label in my hypercall function that is the start of my block. In order to use skinit I want grab the physical address of my label to save in eax register. Thanks if anyone help me. --0016e6dedd8c3b6a4704c1f9fc58 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

On Wed, Jun 6, 2012 at 11:31 PM, Ian Cam= pbell <Ian.Campbell@citrix.com> wrote:
Please don't top post, it makes it hard to follow the flow of the
conversation.

You might also find it useful to read
http://wiki.xen.org/wiki/Asking_Xen_Devel_Questions

On Thu, 2012-06-07 at 05:29 +0100, Zeinab Alebouyeh wrote:
> Thanks but I think if I find the base physical address of xen image I<= br> > can convert virtual address to physical address

I'm not sure what this has to do with taking the address of a lab= el,
like you originally asked, but...

There are macros to convert a xenheap virtual address into a physical
one and back, see __pa and __va. (Note that these only work for xenheap
addresses).

> I'm working in xen4 and my platform is: Processor AMD 64 and Cento= s 6
> i386 with 8G of RAM

Are you using a 32-bit or 64-bit hypervisor?

I strongly recommend basing all future x86 work on 64-bit Xen, even if
you are using a 32 bit dom0.

> Can anyone tell me The physical address that xen image load in it?
> This physical address depends on platform?

Yes, Xen will relocate itself at start of day. You should be able to<= br> figure out the details from the implementation of __pa and __va.

It might be helpful if you described what you are actually trying to
achieve here -- what is your end goal?

Ian.

Hi
Because currently I'm= not in lab I don't know my hypervisor is 32b or 64 bit.
I'm wor= king in a security project. for improve security of applications running in= virtualized environment. I want to use the security instruction of AMD SVM= named SKINIT.
because this instruction must run in ring0, I add a hypercall in xen and wr= ite my codes in my hypercall function.
The skinit instruction takes the = physical address of a block as an input operand( in the eax register) and e= stablish a secure execution environment for a software component(block)
I have a label in my hypercall function that is the start of my block. In o= rder to use skinit I want grab the physical address of my label to save in = eax register.

Thanks if anyone help me.

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