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

["Li, Xin" <xin.li@xxxxxxxxx>]

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: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Zhang, Xiantao
Sent: Wednesday, January 27, 2010 5:09 PM
To: Superymk; xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: 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

 

 

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