Re: [Xen-devel] [PATCH v6 07/10] libxc: introduce soft reset for HVM domains

[Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>]

Julien Grall <julien.grall@xxxxxxxxxx> 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@xxxxxxxxxx>
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

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