On Mon, 2016-08-22 at 11:03 +0100, Leif Lindholm wrote:
>
> > I thought there was a control bit on ARMv8 too which made it cause a
> > fault if the code loaded through, stored via, branched to etc an
> > address with bits set between the maximum physical address bit and the
> > bits architecturall
X-Debbugs-CC: ard.biesheu...@linaro.org
On Sun, Aug 21, 2016 at 02:46:06PM +0100, Ben Hutchings wrote:
> > > I seem to remember that AArch64 has the ill-advised rule that VA bits
> > > outside the range of the current page table format are ignored, so
> > > presumably you're concerned that the cod
X-Debbugs-CC: ard.biesheu...@linaro.org
On Sun, Aug 21, 2016 at 03:04:02PM +0100, Ian Campbell wrote:
> On Sun, 2016-08-21 at 11:42 +0100, Leif Lindholm wrote:
> >
> > You're not wrong, but unfortunately the ability to write semi-portable
> > code left the planet over a decade ago. For clarificat
On Sun, 21 Aug 2016 01:11:15 +0100 Ben Hutchings wrote:
> On Fri, 2016-08-19 at 13:42 +0100, Leif Lindholm wrote:
> > On Fri, Aug 19, 2016 at 12:50:49PM +0100, Ben Hutchings wrote:
> > >
> > > >
> > > > >
> > > > > >
> > > > > > >
> > > > > > > >
> > > > > > > > everything using mozilla-js).
> > >
On Sun, 2016-08-21 at 11:42 +0100, Leif Lindholm wrote:
>
> You're not wrong, but unfortunately the ability to write semi-portable
> code left the planet over a decade ago. For clarification - the
> problem is not with regards to code written specifically for arm64 and
> not verified with differen
On Sun, 2016-08-21 at 11:42 +0100, Leif Lindholm wrote:
> On Sun, Aug 21, 2016 at 01:11:15AM +0100, Ben Hutchings wrote:
> >
> > >
> > > >
> > > > >
> > > > > I think this would be opening up a real can of worms. Not all sizes
> > > > > are supported by the architecture, and only certain VA_BIT
On Sun, Aug 21, 2016 at 01:11:15AM +0100, Ben Hutchings wrote:
> > > > I think this would be opening up a real can of worms. Not all sizes
> > > > are supported by the architecture, and only certain VA_BITS/pagesize
> > > > combinations work in the kernel.
> > > >
> > > > We could switch to 42-bit
On Fri, 2016-08-19 at 13:42 +0100, Leif Lindholm wrote:
> On Fri, Aug 19, 2016 at 12:50:49PM +0100, Ben Hutchings wrote:
> >
> > >
> > > >
> > > > >
> > > > > >
> > > > > > >
> > > > > > > everything using mozilla-js).
> > > > [...]
> > > >
> > > > Could we possibly work around that by reduc
On Fri, Aug 19, 2016 at 12:50:49PM +0100, Ben Hutchings wrote:
> >> > > > everything using mozilla-js).
> >> [...]
> >>
> >> Could we possibly work around that by reducing
> >> CONFIG_ARCH_MMAP_RND_BITS_MAX? (That's not directly configurable; it
> >> requires patching arch/arm64/Kconfig.)
> >
> >
On 19 August 2016 11:26:55 BST, Leif Lindholm wrote:
>On Fri, Aug 19, 2016 at 02:04:07AM +0100, Ben Hutchings wrote:
>> > > > So please enable CONFIG_ARM64_VA_BITS_48 for arm64 kernels.
>> > > >
>> > > > Note: this change _will_ cause breakage in certain userland
>software
>> > > > making non-p
On Fri, Aug 19, 2016 at 02:04:07AM +0100, Ben Hutchings wrote:
> > > > So please enable CONFIG_ARM64_VA_BITS_48 for arm64 kernels.
> > > >
> > > > Note: this change _will_ cause breakage in certain userland software
> > > > making non-portable assumptions about available of top address bits
> > >
> > On Tue, Aug 16, 2016 at 01:13:28PM +0100, Leif Lindholm wrote:
> > >
> > > Package: linux
> > > Version: 4.6.4-1
> > > > > > > > > X-Debbugs-CC: st...@einval.com, woo...@wookware.org,
> > > > > > > > > zheng...@linaro.org
> > >
> > > Upstream commit 211102d85 ("arm64: defconfig: enable 48-b
On Tue, Aug 16, 2016 at 04:39:15PM +0200, Hector Oron wrote:
> On Tue, Aug 16, 2016 at 01:13:28PM +0100, Leif Lindholm wrote:
> > Package: linux
> > Version: 4.6.4-1
> > X-Debbugs-CC: st...@einval.com, woo...@wookware.org, zheng...@linaro.org
> >
> > Upstream commit 211102d85 ("arm64: defconfig: e
On Tue, Aug 16, 2016 at 01:13:28PM +0100, Leif Lindholm wrote:
> Package: linux
> Version: 4.6.4-1
> X-Debbugs-CC: st...@einval.com, woo...@wookware.org, zheng...@linaro.org
>
> Upstream commit 211102d85 ("arm64: defconfig: enable 48-bit virtual
> addresses") changed the default configuration for
Package: linux
Version: 4.6.4-1
X-Debbugs-CC: st...@einval.com, woo...@wookware.org, zheng...@linaro.org
Upstream commit 211102d85 ("arm64: defconfig: enable 48-bit virtual
addresses") changed the default configuration for arm64 to be 48-bit
VA (CONFIG_ARM64_VA_BITS_48). This is required in order
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