Re: [Xen-devel] Slow HVM boot time, was "HVM boot time optimization"

[George Dunlap <dunlapg@xxxxxxxxx>]

On Thu, Feb 8, 2018 at 4:31 PM, Stefano Stabellini
<sstabellini@xxxxxxxxxx> wrote:
> CC'ing xen-devel and a few relevant people
>
> On Thu, 8 Feb 2018, Yessine Daoud wrote:
>> Dear Sir,
>> I need your help please.
>>
>> I am using a direct kernel boot (HVM guest) with kernel + ramdisk.
>> At boot, seabios is bloqued about 20 seconds (or more) at the following 
>> state:
>>
>> (d4) RamSizeOver4G: 0x0000000000000000 [cmos]
>> (d4) boot order:
>> (d4) 1: /rom@genroms/linuxboot.bin
>> (d4) Found 4 PCI devices (max PCI bus is 00)
>> (d4) Allocated Xen hypercall page at ffff000
>> (d4) Detected Xen v4.9-unstable
>> (d4) xen: copy BIOS tables...
>> (d4) Copying SMBIOS entry point from 0x00010020 to 0x000f69b0
>> (d4) Copying MPTABLE from 0xfc001170/fc001180 to 0x000f68b0
>> (d4) Copying PIR from 0x00010040 to 0x000f6830
>> (d4) CPU Mhz=1335
>> (d4) Scan for VGA option rom
>> (d4) ATA controller 1 at 1f0/3f4/c100 (irq 14 dev 9)
>> (d4) ATA controller 2 at 170/374/c108 (irq 15 dev 9)
>> (d4) Found 0 lpt ports
>> (d4) Found 1 serial ports
>> (d4) PS2 keyboard initialized
>> (d4) All threads complete.
>> (d4) Scan for option roms
>> (d4) Running option rom at c000:0003
>> (d4) Searching bootorder for: /rom@genroms/linuxboot.bin
>> (d4) Searching bootorder for: HALT
>> (d4) Space available for UMB: c0800-ec800, f61d0-f67f0
>> (d4) Returned 258048 bytes of ZoneHigh
>> (d4) e820 map has 6 items:
>> (d4)   0: 0000000000000000 - 000000000009fc00 = 1 RAM
>> (d4)   1: 000000000009fc00 - 00000000000a0000 = 2 RESERVED
>> (d4)   2: 00000000000f0000 - 0000000000100000 = 2 RESERVED
>> (d4)   3: 0000000000100000 - 000000000ffff000 = 1 RAM
>> (d4)   4: 000000000ffff000 - 0000000010000000 = 2 RESERVED
>> (d4)   5: 00000000fc000000 - 0000000100000000 = 2 RESERVED
>> (d4) enter handle_19:
>> (d4)   NULL
>> (d4) Booting from ROM...
>> (d4) Booting from c000:00
>>
>>
>> Then (after 20 seconds) the kernel starts booting.
>> Any idea about this behavior?
>
> I am guessing one of the ROMs take a long time to run. It might be
> waiting for a timeout, like ipxe. Does anybody know about this issue?

The ipxe roms should only be loaded if specified in the VM config
file, right?  Why would you specify ipxe if you're going to be
direct-booting anyway?

 -George

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