[vbox-dev] Kernel v4.12 API changes

[Sérgio Basto]

On Fri, 2017-05-19 at 13:43 -0500, Larry Finger wrote:
> On 05/19/2017 04:57 AM, Frank Mehnert wrote:
> > On Mittwoch, 17. Mai 2017 20:49:42 CEST Frank Mehnert wrote:
> > > Hi Larry,
> > > 
> > > On Montag, 15. Mai 2017 16:35:30 CEST Larry Finger wrote:
> > > > Has anyone found the magic elixir to allow VB to run with
> > > > kernel 4.12-rc1?
> > > > 
> > > > Adding #include <asm/set_memory.h> to
> > > > vboxdrv/r0drv/linux/alloc-r0drv-linux.c is
> > > > trivial; however, I'm having trouble with changes in the page
> > > > table walk code in
> > > > vboxdrv/r0drv/linux/memobj-r0drv-linux.c. I followed the
> > > > changes in the kernel
> > > > and I have code that compiles cleanly, but as soon as I try to
> > > > start a VM, the
> > > > system locks up and panics a few seconds later. At this point,
> > > > I have no
> > > > diagnostics concerning where the fault happened.
> > > 
> > > we are working on a fix. The obvious fixes can be found in
> > > r66927, r66928
> > > and r66930. These changes make the modules compile against Linux
> > > 4.12-rc1
> > > but as you noticed, the kernel panics when starting a VM. We are
> > > debugging
> > > this issue.
> > 
> > quick fix for the remaining issue (freeze on VM start) is the
> > following:
> > 
> > --- src/VBox/HostDrivers/Support/linux/SUPDrv-linux.c   (revision
> > 115504)
> > +++ src/VBox/HostDrivers/Support/linux/SUPDrv-linux.c   (working
> > copy)
> > @@ -1397,7 +1397,7 @@
> >   SUPR0DECL(uint32_t) SUPR0GetKernelFeatures(void)
> >   {
> >       uint32_t fFlags = 0;
> > -#ifdef CONFIG_PAX_KERNEXEC
> > +#if defined(CONFIG_PAX_KERNEXEC) || LINUX_VERSION_CODE >=
> > KERNEL_VERSION(4, 12, 0)
> >       fFlags |= SUPKERNELFEATURES_GDT_READ_ONLY;
> >   #endif
> >   #if defined(VBOX_STRICT) ||
> > defined(VBOX_WITH_EFLAGS_AC_SET_IN_VBOXDRV)
> > 
> > The reason is that the GDT is mapped read-only as of Linux 4.12. We
> > have
> > not yet decided if this will be the final fix for the moment or if
> > an
> > alternative fix (which requires changes to the VMM part as well) is
> > the
> > better choice.
> 
> Thanks for this update. At least the current set of patches will
> allow VB to 
> build on my kernel, and when the Kernel:HEAD project at openSUSE
> switches to 
> 4.12.0-rcX.

Hi , Larry 

I expect to see yours patches in 
https://build.opensuse.org/package/show/Virtualization/virtualbox

but patches for 4.12.0-rcX still not published , could you send it to
us ? , to apply on my VirtualBox package in RPMFusion  ... 

Thanks.

> Larry
> 
> 
> 
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-- 
Sérgio M. B.