Re: [PATCH] KVM: arm64: add workaround for Cortex-A57 erratum #852523

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Mon, Sep 14, 2015 at 04:46:28PM +0100, Marc Zyngier wrote:
> On 14/09/15 16:06, Will Deacon wrote:
> > When restoring the system register state for an AArch32 guest at EL2,
> > writes to DACR32_EL2 may not be correctly synchronised by Cortex-A57,
> > which can lead to the guest effectively running with junk in the DACR
> > and running into unexpected domain faults.
> > 
> > This patch works around the issue by re-ordering our restoration of the
> > AArch32 register aliases so that they happen before the AArch64 system
> > registers. Ensuring that the registers are restored in this order
> > guarantees that they will be correctly synchronised by the core.
> > 
> > Cc: <stable@xxxxxxxxxxxxxxx>
> > Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
> > Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
> 
> Reviewed-by: Marc Zyngier <marc.zyngier@xxxxxxx>
> 
> I'll queue that together with the next batch of fixes.

Great, thanks Marc.

Will
--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Linux Kernel]     [Kernel Development Newbies]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Hiking]     [Linux Kernel]     [Linux SCSI]