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xen-devel
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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2. xin.li@xxxxxxxxx
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3. xiantao.zhang@xxxxxxxxx
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