From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@citrix.com>
Subject: Re: [PATCH v6 07/10] libxc: introduce soft reset for
 HVM domains
Date: Wed, 20 May 2015 16:10:04 +0100
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To: Vitaly Kuznetsov <vkuznets@redhat.com>, xen-devel@lists.xenproject.org
Cc: 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>, Wei Liu <wei.liu2@citrix.com>, Daniel De Graaf <dgdegra@tycho.nsa.gov>
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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.

Regards,

-- 
Julien Grall