From mboxrd@z Thu Jan  1 00:00:00 1970
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: [PATCH 5/9] x86/pvh: Set PVH guest's mode in
	XEN_DOMCTL_set_address_size
Date: Wed, 24 Jun 2015 07:42:10 -0400
Message-ID: <558A9792.5000600@oracle.com>
References: <1434769773-5157-1-git-send-email-boris.ostrovsky@oracle.com>
	<1434769773-5157-6-git-send-email-boris.ostrovsky@oracle.com>
	<558979CF0200007800088537@mail.emea.novell.com>
	<558A1BA1.9060600@oracle.com>
	<558A7F0B0200007800088B52@mail.emea.novell.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; Format="flowed"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
In-Reply-To: <558A7F0B0200007800088B52@mail.emea.novell.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Jan Beulich <JBeulich@suse.com>
Cc: elena.ufimtseva@oracle.com, tim@xen.org, Kevin Tian <kevin.tian@intel.com>, Keir Fraser <keir@xen.org>, Andrew Cooper <andrew.cooper3@citrix.com>, Eddie Dong <eddie.dong@intel.com>, xen-devel@lists.xen.org, Jun Nakajima <jun.nakajima@intel.com>, roger.pau@citrix.com
List-Id: xen-devel@lists.xenproject.org

On 06/24/2015 03:57 AM, Jan Beulich wrote:
>>>> On 24.06.15 at 04:53, <boris.ostrovsky@oracle.com> wrote:
>> On 06/23/2015 09:22 AM, Jan Beulich wrote:
>>>> --- a/xen/arch/x86/hvm/hvm.c
>>>> +++ b/xen/arch/x86/hvm/hvm.c
>>>> @@ -2320,12 +2320,7 @@ int hvm_vcpu_initialise(struct vcpu *v)
>>>>        v->arch.hvm_vcpu.inject_trap.vector = -1;
>>>>    
>>>>        if ( is_pvh_domain(d) )
>>>> -    {
>>>> -        v->arch.hvm_vcpu.hcall_64bit = 1;    /* PVH 32bitfixme. */
>>>> -        /* This is for hvm_long_mode_enabled(v). */
>>>> -        v->arch.hvm_vcpu.guest_efer = EFER_LMA | EFER_LME;
>>>>            return 0;
>>>> -    }
>>> With this removed, is there any guarantee that hvm_set_mode()
>>> will be called for each vCPU?
>> IIUIC, toolstack is required to call XEN_DOMCTL_set_address_size which
>> results in a call to switch_compat/native(), which loop over all VCPUs,
>> calling set_mode.
> I don't recall this being a strict requirement. I think a PV 64-bit
> guest would start fine without.

We do call it via libxl__build_pv() -> xc_dom_boot_mem_init() -> 
arch_setup_mem_init() -> x86_compat().

-boris