Hi Will,

On Tue, Aug 13, 2019 at 3:10 PM Will Deacon [off-list ref] wrote:

On Tue, Aug 13, 2019 at 02:43:23PM +0200, Geert Uytterhoeven wrote:

quoted

On Fri, Aug 9, 2019 at 6:47 PM Will Deacon [off-list ref] wrote:

quoted

On Wed, Aug 07, 2019 at 04:55:12PM +0100, Steve Capper wrote:

quoted

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

Thanks, that seems to do the trick!

Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>

Also, what .config are you using?

Attached.

Probably CONFIG_DEBUG_VIRTUAL=y is what you're missing.


Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds