Hi Geert,

On Tue, Aug 13, 2019 at 02:43:23PM +0200, Geert Uytterhoeven wrote:
> On Fri, Aug 9, 2019 at 6:47 PM Will Deacon <w...@kernel.org> wrote:
> > On Wed, Aug 07, 2019 at 04:55:12PM +0100, Steve Capper wrote:
> > > This patch series adds support for 52-bit kernel VAs using some of the
> > > machinery already introduced by the 52-bit userspace VA code in 5.0.
> >
> > Cheers, I've pushed this out on a for-next/52-bit-kva branch with one
> > small patch on top and Catalin's tags added.
> 
> As of commit 14c127c957c1c607 ("arm64: mm: Flip kernel VA space"), the
> kernel log is spammed with
> 
>     virt_to_phys used for non-linear address: (____ptrval____)
> (__func__.6603+0x14d681/0x17fb3d)
>     WARNING: CPU: 0 PID: 264 at arch/arm64/mm/physaddr.c:15
> __virt_to_phys+0x28/0x58
>     Modules linked in:
>     CPU: 0 PID: 264 Comm: mdev Not tainted
> 5.3.0-rc3-rcar3-initrd-00002-g14c127c957c1c607 #38
>     Hardware name: Renesas Ebisu-4D board based on r8a77990 (DT)
>     pstate: 60000005 (nZCv daif -PAN -UAO)
>     pc : __virt_to_phys+0x28/0x58
>     lr : __virt_to_phys+0x28/0x58
>     sp : ffffffc011953c80
>     x29: ffffffc011953c80 x28: ffffff8078790140
>     x27: 0000000000000000 x26: 0000000000000000
>     x25: ffffffc010a539b9 x24: ffffffc010a86000
>     x23: ffffffc010a539ba x22: 0000000000000001
>     x21: 0000000000202038 x20: 0000000000000001
>     x19: ffffffc010a539b9 x18: 000000000000000a
>     x17: 0000000000000000 x16: 0000000000000000
>     x15: 00000000000ca51d x14: 0720072007200720
>     x13: 0720072007200720 x12: 0720072007200720
>     x11: 0720072007200720 x10: 0720072007200720
>     x9 : 0720072007200720 x8 : 0000000000000001
>     x7 : 0000000000000007 x6 : ffffff8079824f00
>     x5 : 0000000000000140 x4 : 0000000000000000
>     x3 : 0000000000000000 x2 : 00000000ffffffff
>     x1 : 0713abbc9281cf00 x0 : 0000000000000000
>     Call trace:
>      __virt_to_phys+0x28/0x58
>      __check_object_size+0xd0/0x1e0
>      filldir64+0x1d8/0x2b0
>      kernfs_fop_readdir+0x64/0x200
>      iterate_dir+0x68/0x144
>      ksys_getdents64+0x88/0x154
>      __arm64_sys_getdents64+0x18/0x24
>      el0_svc_common.constprop.0+0x84/0xe8
>      el0_svc_compat_handler+0x18/0x20
>      el0_svc_compat+0x8/0x10
>     ---[ end trace 6980a45f636e18be ]---
> 
> as soon as userspace starts.

Can you try the hack I posted here, please?

https://lkml.org/lkml/2019/8/13/555

Also, what .config are you using?

Will

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