Hi Roger,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.17-rc4 next-20180509]
[cannot apply to xen-tip/linux-next]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Roger-Pau-Monne/xen-pvh-Dom0-support/20180509-222240
config: x86_64-randconfig-x009-201818 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   arch/x86/xen/enlighten_pvh.c: In function 'xen_prepare_pvh':
>> arch/x86/xen/enlighten_pvh.c:101:2: error: 'xen_start_flags' undeclared (first use in this function); did you mean 'xen_start_info'?
     xen_start_flags = pvh_start_info.flags;
     ^~~~~~~~~~~~~~~
     xen_start_info
   arch/x86/xen/enlighten_pvh.c:101:2: note: each undeclared identifier is reported only once for each function it appears in

vim +101 arch/x86/xen/enlighten_pvh.c

    84	
    85	/*
    86	 * This routine (and those that it might call) should not use
    87	 * anything that lives in .bss since that segment will be cleared later.
    88	 */
    89	void __init xen_prepare_pvh(void)
    90	{
    91		u32 msr;
    92		u64 pfn;
    93	
    94		if (pvh_start_info.magic != XEN_HVM_START_MAGIC_VALUE) {
    95			xen_raw_printk("Error: Unexpected magic value (0x%08x)\n",
    96					pvh_start_info.magic);
    97			BUG();
    98		}
    99	
   100		xen_pvh = 1;
 > 101		xen_start_flags = pvh_start_info.flags;

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