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

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

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?

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