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Re: [Xen-devel] can't boot from iso on cifs mount

Strace shows that qemu after O_DIRECT next try with O_DIRECT open("/var/storage/iso/winpe_amd64.iso", O_RDONLY|O_DIRECT) = -1 EINVAL (Invalid argument) write(2, "xen be: qdisk-832: ", 19) = 19 write(2, "xen be: qdisk-832: ", 19) = 19 write(2, "opening /var/storage/iso/winpe_a"..., 85) = 85 write(2, "opening /var/storage/iso/winpe_a"..., 85) = 85 open("/var/storage/iso/winpe_amd64.iso", O_RDONLY|O_DIRECT) = -1 EINVAL (Invalid argument) 2013/1/30 Vasiliy Tolstov <v.tolstov@xxxxxxxxx>: > Thanks for patch. But it not solve problem: > Now i have : > domid: 6 > Using file /dev/disk/vbd/21-828 in read-write mode > Strip off blktap sub-type prefix to (drv 'aio') > Watching /local/domain/0/device-model/6/logdirty/cmd > Watching /local/domain/0/device-model/6/command > Watching /local/domain/6/cpu > char device redirected to /dev/pts/5 > qemu_map_cache_init nr_buckets = 10000 size 4194304 > Could not open /var/run/tap/qemu-read-6 > shared page at pfn feffd > buffered io page at pfn feffb > Guest uuid = c98c33c8-1891-41ec-96a0-984f3df80def > xen be: qdisk-5632: xen be: qdisk-5632: opening with O_DIRECT failed, > trying write-through. > opening with O_DIRECT failed, trying write-through. > populating video RAM at ff000000 > mapping video RAM from ff000000 > Register xen platform. > Done register platform. > platform_fixed_ioport: changed ro/rw state of ROM memory area. now is rw > state. > xs_read(/local/domain/0/device-model/6/xen_extended_power_mgmt): read error > medium change watch on `hdc' (index: 1): aio: > I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0 > Log-dirty: no command yet. > I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0 > I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0 > vcpu-set: watch node error. > I/O request not ready: 0, ptr: 0, port: 0, data: 0, count: 0, size: 0 > xs_read(/local/domain/6/log-throttling): read error > qemu: ignoring not-understood drive `/local/domain/6/log-throttling' > medium change watch on `/local/domain/6/log-throttling' - unknown > device, ignored > xen be: qdisk-5632: xen be: qdisk-5632: opening with O_DIRECT failed, > trying write-through. > opening with O_DIRECT failed, trying write-through. > log_throttling disabled > qemu: ignoring not-understood drive `/local/domain/6/log-throttling' > medium change watch on `/local/domain/6/log-throttling' - unknown > device, ignored > vga s->lfb_addr = f0000000 s->lfb_end = f1000000 > platform_fixed_ioport: changed ro/rw state of ROM memory area. now is rw > state. > platform_fixed_ioport: changed ro/rw state of ROM memory area. now is ro > state. > > > (XEN) HVM6: VGABios $Id: vgabios.c,v 1.67 2008/01/27 09:44:12 vruppert Exp $ > (XEN) HVM6: VBE Bios $Id: vbe.c,v 1.60 2008/03/02 07:47:21 vruppert Exp $ > (XEN) HVM6: Bochs BIOS - build: 06/23/99 > (XEN) HVM6: $Revision: 1.221 $ $Date: 2008/12/07 17:32:29 $ > (XEN) HVM6: Options: apmbios pcibios eltorito PMM > (XEN) HVM6: > (XEN) HVM6: ata0-0: PCHS=16383/16/63 translation=lba LCHS=1024/255/63 > (XEN) HVM6: ata0 master: QEMU HARDDISK ATA-7 Hard-Disk (10246 MBytes) > (XEN) HVM6: IDE time out > (XEN) HVM6: ata1 master: QEMU DVD-ROM ATAPI-4 CD-Rom/DVD-Rom > (XEN) HVM6: IDE time out > (XEN) HVM6: > (XEN) HVM6: > (XEN) HVM6: > (XEN) HVM6: Press F12 for boot menu. > (XEN) HVM6: > (XEN) HVM6: Booting from Hard Disk... > (XEN) HVM6: Boot from Hard Disk failed: not a bootable disk > (XEN) HVM6: > (XEN) HVM6: > (XEN) HVM6: No bootable device. > (XEN) HVM6: Powering off in 30 seconds. > (XEN) hvm.c:1080:d6 All CPUs offline -- powering off. > > 2013/1/22 Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>: >> On Tue, 22 Jan 2013, Ian Campbell wrote: >>> Please don't top post. >>> >>> On Tue, 2013-01-22 at 05:38 +0000, Vasiliy Tolstov wrote: >>> > Thanks! >>> > I found, that now xl tries to open iso with O_DIRECT flag. >>> > open("/var/storage/iso/SW_DVD5_Windows_Svr_DC_EE_SE_Web_2008_R2_64Bit_Russian_w_SP1_MLF_X17-22616_vase.iso", >>> > O_RDONLY|O_DIRECT) = -1 EINVAL (Invalid argument) >>> > write(2, "qemu: could not open vbd '/local"..., 217) = 217 >> >> xl? I guess you mean QEMU tries to open the ISO with O_DIRECT. >> >> >>> I guess CIFS doesn't support O_DIRECT. It looks like it does have mount >>> -o directio though, worth a try. >>> >>> I'm not sure what options exist to turn this off from the qemu side -- >>> Stefano? I also have a feeling something changed in this regard in 4.2.x >> >> Given that you are not passing any device_model_version option to xl, I >> assume that you are running qemu-xen-traditional (ps should show that a >> binary called qemu-dm is running). >> >> If that is the case, there is currently no way to specify any flags. >> However the interesting bit is that qemu-xen-traditional opens files >> corresponding to emulated devices with BDRV_O_CACHE_WB and opens files >> corresponding to PV interfaces using BDRV_O_NOCACHE (this means >> O_DIRECT). >> This means that the failure should be caused by hw/xen_disk.c trying to >> opening the iso O_DIRECT. Paradoxically the PV inteface for a cdrom >> drive is usually never used AFAIK. >> >> Did the Windows PV drivers start using the PV cdrom interface all of a >> sudden? >> >> In any case I think that the best thing we could do it fall back to >> write-through (or should it be write-back? It might not be safe..) in >> case O_DIRECT fails. This is what qemu-xen does in such cases. >> >> Try this patch: >> >> --- >> >> diff --git a/hw/xen_disk.c b/hw/xen_disk.c >> index 33a5531..d6d71fe 100644 >> --- a/hw/xen_disk.c >> +++ b/hw/xen_disk.c >> @@ -659,9 +659,16 @@ static int blk_init(struct XenDevice *xendev) >> if (blkdev->bs) { >> if (bdrv_open2(blkdev->bs, blkdev->filename, qflags, >> bdrv_find_format(blkdev->fileproto)) != 0) { >> - bdrv_delete(blkdev->bs); >> - blkdev->bs = NULL; >> - } >> + /* try without O_DIRECT */ >> + xen_be_printf(&blkdev->xendev, 0, "opening %s with O_DIRECT >> failed, trying write-through.\n", >> + blkdev->filename); >> + qflags &= BDRV_O_NOCACHE; >> + if (bdrv_open2(blkdev->bs, blkdev->filename, qflags, >> + bdrv_find_format(blkdev->fileproto)) != 0) { >> + bdrv_delete(blkdev->bs); >> + blkdev->bs = NULL; >> + } >> + } >> } >> if (!blkdev->bs) >> return -1; >> > > > > -- > Vasiliy Tolstov, > Clodo.ru > e-mail: v.tolstov@xxxxxxxxx > jabber: vase@xxxxxxxxx -- Vasiliy Tolstov, Clodo.ru e-mail: v.tolstov@xxxxxxxxx jabber: vase@xxxxxxxxx _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel

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