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Re: [Xen-devel] How to turn on EPT support?

All right, I'll verify it. Can I really modify it on the xen wiki? I've never dreamed about that. :)

--------------------------------------------------
From: "PasiKärkkäinen" <pasik@xxxxxx>
Sent: Wednesday, January 27, 2010 7:26 PM
To: "Superymk" <superymkxen@xxxxxxxxxxx>
Cc: <xen-devel@xxxxxxxxxxxxxxxxxxx>; "Li, Xin" <xin.li@xxxxxxxxx>
Subject: Re: [Xen-devel] How to turn on EPT support?

On Wed, Jan 27, 2010 at 06:49:20PM +0800, Superymk wrote:
   Thanks. I tailor the hvm example configuration file in xen manually
instead of using Virtual Machine Manager. I use your method to verify it
   and the problem is solved now.
However I find that hap configuration belongs to the Timers category in
   Xen Configurations Details
([1]http://www.xen.org/files/Support/XenConfigurationDetails.pdf), is it a
   mistake?


Here's the wiki version of the pdf, created just yesterday:
http://wiki.xensource.com/xenwiki/XenConfigurationFileOptions

It's easy to edit and fix the stuff in the wiki now :)

-- Pasi

   Miao
   From: [2]Li, Xin
   Sent: Wednesday, January 27, 2010 5:53 PM
   To: [3]Zhang, Xiantao ; [4]Superymk ; [5]xen-devel@xxxxxxxxxxxxxxxxxxx
   Cc: [6]ken.mingyuan@xxxxxxxxxxx
   Subject: RE: [Xen-devel] How to turn on EPT support?

   i7 965 has EPT support.

Use command *xm debug-k v; xm dmesg* to see if EPT pointer is 0. If 0 then
   EPT should disabled for the guest.

   as Xiantao mentioned, I guess your hap in config file is set to 0. By
   default if you don*t set it, ept should be enabled.

   Thanks!

   -Xin



   From: [7]xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Zhang, Xiantao
   Sent: Wednesday, January 27, 2010 5:09 PM
   To: Superymk; [8]xen-devel@xxxxxxxxxxxxxxxxxxx
   Cc: [9]ken.mingyuan@xxxxxxxxxxx
   Subject: RE: [Xen-devel] How to turn on EPT support?



Can you check Xen's boot log to see whether the sentence as following is
   printed out ?



   (XEN) HVM: Hardware Assisted Paging detected.



I don't know Xen-3.4.2's policy for EPT's default option, maybe you can add "hap=1" in your configuration file to ensure EPT on when you create
   virtual machine  if the system supports it.



   Xiantao



   --------------------------------------------------------------------------

   From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
   [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Superymk
   Sent: Wednesday, January 27, 2010 2:42 PM
   To: xen-devel@xxxxxxxxxxxxxxxxxxx
   Cc: ken.mingyuan@xxxxxxxxxxx
   Subject: [Xen-devel] How to turn on EPT support?

To test if EPT is enabled on my machine, I add some codes in my own xen shadow and create a guest vm (named testvm) by Virtual Machine Manager. However, it seems that testvm doesn't use EPT at all (See the log). So how
   to turn on EPT support? I thought it should be enabled automatically.



   My box is configured as:

   Intel Core i7 965

   2G*3 DDR3 1333

   Seagate 1T



   Centos 5.2

   Xen-3.4.2 with linux 2.6.18 xenified kernel (downloaded from xen.org)



   Log:

   (XEN) (Joan)domain.c:388: Domain ID 32767
   (XEN) (Joan)domain.c:389: is_hvm_domain(d) 0
   (XEN) (Joan)domain.c:390: hvm_funcs.hap_supported 0
   (XEN) (Joan)domain.c:391: (domcr_flags & DOMCRF_hap) 0
   (XEN) (Joan)p2m.c:1464: is_hvm_domain(d)  0
   (XEN) (Joan)p2m.c:1465: d->arch.hvm_domain.hap_enabled 0
   (XEN) (Joan)p2m.c:1466: X86_VENDOR_INTEL 1
   (XEN) (Joan)p2m.c:1473: d->arch.p2m->set_entry FFFF828C8019FD50
   (XEN) (Joan)p2m.c:1474: p2m_set_entry FFFF828C8019FD50
   (XEN) (Joan)domain.c:388: Domain ID 0
   (XEN) (Joan)domain.c:389: is_hvm_domain(d) 0
   (XEN) (Joan)domain.c:390: hvm_funcs.hap_supported 1
   (XEN) (Joan)domain.c:391: (domcr_flags & DOMCRF_hap) 0
   (XEN) (Joan)p2m.c:1464: is_hvm_domain(d)  0
   (XEN) (Joan)p2m.c:1465: d->arch.hvm_domain.hap_enabled 0
   (XEN) (Joan)p2m.c:1466: X86_VENDOR_INTEL 1
   (XEN) (Joan)p2m.c:1473: d->arch.p2m->set_entry FFFF828C8019FD50
   (XEN) (Joan)p2m.c:1474: p2m_set_entry FFFF828C8019FD50
   (XEN) (Joan)domain.c:388: Domain ID 1
   (XEN) (Joan)domain.c:389: is_hvm_domain(d) 1
   (XEN) (Joan)domain.c:390: hvm_funcs.hap_supported 1
   (XEN) (Joan)domain.c:391: (domcr_flags & DOMCRF_hap) 0
   (XEN) (Joan)p2m.c:1464: is_hvm_domain(d)  1
   (XEN) (Joan)p2m.c:1465: d->arch.hvm_domain.hap_enabled 0
   (XEN) (Joan)p2m.c:1466: X86_VENDOR_INTEL 1
   (XEN) (Joan)p2m.c:1473: d->arch.p2m->set_entry FFFF828C8019FD50
   (XEN) (Joan)p2m.c:1474: p2m_set_entry FFFF828C8019FD50



   Modified Code:

   /* Init the datastructures for later use by the p2m code */
   1442: int p2m_init(struct domain *d)
   {
       struct p2m_domain *p2m;



       p2m = xmalloc(struct p2m_domain);
       if ( p2m == NULL )
           return -ENOMEM;



       d->arch.p2m = p2m;



       memset(p2m, 0, sizeof(*p2m));
       p2m_lock_init(p2m);
       INIT_PAGE_LIST_HEAD(&p2m->pages);
       INIT_PAGE_LIST_HEAD(&p2m->pod.super);
       INIT_PAGE_LIST_HEAD(&p2m->pod.single);



       p2m->set_entry = p2m_set_entry;
       p2m->get_entry = p2m_gfn_to_mfn;
       p2m->get_entry_current = p2m_gfn_to_mfn_current;
       p2m->change_entry_type_global = p2m_change_type_global;

    joan_dprintk("is_hvm_domain(d)  %d\n", is_hvm_domain(d));
    joan_dprintk("d->arch.hvm_domain.hap_enabled %d\n",
   d->arch.hvm_domain.hap_enabled);
    joan_dprintk("X86_VENDOR_INTEL %d\n", (boot_cpu_data.x86_vendor ==
   X86_VENDOR_INTEL));
       if ( is_hvm_domain(d) && d->arch.hvm_domain.hap_enabled &&
            (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) )
    {
     joan_dprintk("Add Ept Support\n");
           ept_p2m_init(d);
    }
    joan_dprintk("d->arch.p2m->set_entry %lX\n",
   (uint64_t)(d->arch.p2m->set_entry) );
    joan_dprintk("p2m_set_entry %lX\n", (uint64_t)p2m_set_entry);



       return 0;
   }





   Thanks,

   Miao





References

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   1. http://www.xen.org/files/Support/XenConfigurationDetails.pdf
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   2. xin.li@xxxxxxxxx
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   3. xiantao.zhang@xxxxxxxxx
mailto:xiantao.zhang@xxxxxxxxx
   4. superymkxen@xxxxxxxxxxx
mailto:superymkxen@xxxxxxxxxxx
   5. xen-devel@xxxxxxxxxxxxxxxxxxx
mailto:xen-devel@xxxxxxxxxxxxxxxxxxx
   6. ken.mingyuan@xxxxxxxxxxx
mailto:ken.mingyuan@xxxxxxxxxxx
   7. mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
   8. mailto:xen-devel@xxxxxxxxxxxxxxxxxxx
   9. mailto:ken.mingyuan@xxxxxxxxxxx

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