From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vitaly Kuznetsov <vkuznets@redhat.com>
Subject: Re: [PATCH v6 07/10] libxc: introduce soft reset for
	HVM domains
Date: Wed, 20 May 2015 17:20:19 +0200
Message-ID: <87pp5v46oc.fsf@vitty.brq.redhat.com>
References: <1431510585-12544-1-git-send-email-vkuznets@redhat.com>
	<1431510585-12544-8-git-send-email-vkuznets@redhat.com>
	<555CA3CC.2080003@citrix.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
Received: from mail6.bemta3.messagelabs.com ([195.245.230.39])
	by lists.xen.org with esmtp (Exim 4.72)
	(envelope-from <vkuznets@redhat.com>) id 1Yv5nI-0003hc-Co
	for xen-devel@lists.xenproject.org; Wed, 20 May 2015 15:20:28 +0000
In-Reply-To: <555CA3CC.2080003@citrix.com> (Julien Grall's message of "Wed, 20
	May 2015 16:10:04 +0100")
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: Julien Grall <julien.grall@citrix.com>
Cc: Wei Liu <wei.liu2@citrix.com>, Andrew Jones <drjones@redhat.com>, Keir Fraser <keir@xen.org>, Ian Campbell <ian.campbell@citrix.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Julien Grall <julien.grall@linaro.org>, Ian Jackson <ian.jackson@eu.citrix.com>, Olaf Hering <olaf@aepfle.de>, Tim Deegan <tim@xen.org>, David Vrabel <david.vrabel@citrix.com>, Jan Beulich <jbeulich@suse.com>, xen-devel@lists.xenproject.org, Daniel De Graaf <dgdegra@tycho.nsa.gov>
List-Id: xen-devel@lists.xenproject.org

Julien Grall <julien.grall@citrix.com> writes:

> Hi Vitaly,
>
> On 13/05/15 10:49, Vitaly Kuznetsov wrote:
>> +int xc_domain_soft_reset(xc_interface *xch, uint32_t source_dom,
>> +                         uint32_t dest_dom, domid_t console_domid,
>> +                         unsigned long *console_mfn, domid_t store_domid,
>> +                         unsigned long *store_mfn)
>> +{
>> +    xc_dominfo_t old_info, new_info;
>> +    int rc = 1;
>> +
>> +    uint32_t hvm_buf_size = 0;
>> +    uint64_t nr_trans;
>> +    uint8_t *hvm_buf = NULL;
>> +    unsigned long console_pfn, store_pfn, io_pfn, buffio_pfn;
>> +    uint64_t hvm_params[HVM_NR_PARAMS];
>> +    xen_pfn_t sharedinfo_pfn;
>> +
>> +    DPRINTF("%s: soft reset domid %u -> %u", __func__, source_dom, dest_dom);
>> +
>> +    if ( xc_domain_getinfo(xch, source_dom, 1, &old_info) != 1 )
>> +    {
>> +        PERROR("Could not get old domain info");
>> +        return 1;
>> +    }
>> +
>> +    if ( xc_domain_getinfo(xch, dest_dom, 1, &new_info) != 1 )
>> +    {
>> +        PERROR("Could not get new domain info");
>> +        return 1;
>> +    }
>
> xc_domain_getinfo returns the first domain ID used from dest_dom. If
> dest_dom doesn't exist it may return another domain.
>
> Therefore you have to check that the info correspond to the correct domain.

Oh, thanks, I fixed xc_get_tot_pages() a while ago:

commit 5dcd0dcb85941bd92336e01ae3f8c44730099c96
Author: Vitaly Kuznetsov <vkuznets@redhat.com>
Date:   Tue Dec 2 16:18:08 2014 +0100

    libxc: check in xc_get_tot_pages() that the proper domain is
    reported

but I already managed to forget that xc_domain_getinfo() needs
additional check. Its interface is a bit misleading :-(

>
> Regards,


-- 
  Vitaly