linux-kernel - Re: [Xen-devel] [PATCH RESEND] xen/gntdev: Grant maps should not be subject to NUMA balancing

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Message-ID: <20161110174734.GB5937@aepfle.de>
Date:   Thu, 10 Nov 2016 18:47:34 +0100
From:   Olaf Hering <olaf@...fle.de>
To:     Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     konrad.wilk@...cle.com, david.vrabel@...rix.com,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        xen-devel@...ts.xen.org
Subject: Re: [Xen-devel] [PATCH RESEND] xen/gntdev: Grant maps should not be
 subject to NUMA balancing

On Thu, Nov 10, Boris Ostrovsky wrote:

> Are you sure it's this patch that causes the failure?
> 
> I commented out '| VM_IO' and still unable to boot with this option.

Yes, this works for me, sles12sp2 dom0+domU, which is linux-4.4 based:

+++ b/drivers/xen/gntdev.c
@@ -804,7 +804,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
 
        vma->vm_ops = &gntdev_vmops;
 
-       vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP | VM_IO;
+       vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP /*| VM_IO*/;
 
        if (use_ptemod)
                vma->vm_flags |= VM_DONTCOPY;

with this domU.cfg:

name="x"
memory=1024
serial="pty"
builder="hvm"
disk=[ 'vdev=xvda, direct-io-safe, backendtype=qdisk, target=x.raw', ]
vif=[ 'bridge=br0' ]
keymap="de"
cmdline="linemode=1 console=ttyS0,115200 ignore_loglevel install=http://host/sles_dvd1/ start_shell"
kernel= "/sles_dvd1/boot/x86_64/vmlinuz-xen"
ramdisk="/sles_dvd1/boot/x86_64/initrd-xen"


Without VM_IO 'fdisk -l /dev/xvda' works, with VM_IO 'fdisk -l
/dev/xvda' gives IO errors.

Olaf

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