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kvm: Add rw to default kernel command line parameters

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As reported by Asias He, guest kernels mount filesystems as readonly under our
hypervisor:

  without rw:
  [    0.909000] EXT3-fs: mounted filesystem with writeback data mode.
  [    0.909000] VFS: Mounted root (ext3 filesystem) readonly on device 253:1.

  /dev/root on / type ext3 (ro,relatime,errors=continue,data=writeback)

by passing the "rw" kernel parameter, guest kernels are able to mount as
read-write:

  [    0.891000] EXT3 FS on vda1, internal journal
  [    0.891000] EXT3-fs: recovery complete.
  [    0.892000] EXT3-fs: mounted filesystem with writeback data mode.
  [    0.892000] VFS: Mounted root (ext3 filesystem) on device 253:1.

  /dev/root on / type ext3 (rw,relatime,errors=continue,data=writeback)

There's some real problem hiding here but as we've done with other parts of the
kernel (PCI, SMP), just bypass the problem for now.

Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Asias He
2015-06-01 16:39:41 +01:00
committed by Will Deacon
parent a276ccb50a
commit ceba1fad4c
1 changed files with 1 additions and 1 deletions
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main.c
+1 -1
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@@ -110,7 +110,7 @@ int main(int argc, char *argv[])
kvm__setup_cpuid(kvm);
strcpy(real_cmdline, "notsc nolapic nosmp noacpi pci=conf1 earlyprintk=ttyS0,keep root=fc00 ");
strcpy(real_cmdline, "notsc nolapic nosmp noacpi pci=conf1 earlyprintk=ttyS0,keep root=fc00 rw ");
if (kernel_cmdline) {
strlcat(real_cmdline, kernel_cmdline, sizeof(real_cmdline));
real_cmdline[sizeof(real_cmdline)-1] = '\0';