From mboxrd@z Thu Jan 1 00:00:00 1970 From: Julien Grall Subject: Re: [PATCH 0/6] iomem cacheability Date: Tue, 5 Mar 2019 22:45:52 +0000 Message-ID: References:

Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============6700256480039020101==" Return-path: Received: from us1-rack-dfw2.inumbo.com ([104.130.134.6]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1h1Ip7-0002V3-7Z for xen-devel@lists.xenproject.org; Tue, 05 Mar 2019 22:46:09 +0000 Received: by mail-vk1-xa44.google.com with SMTP id v131so2359836vkd.3 for ; Tue, 05 Mar 2019 14:46:06 -0800 (PST) In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" To: Stefano Stabellini Cc: wei.liu2@citrix.com, Andrew Cooper , Amit Tomer , Julien Grall , Jan Beulich , xen-devel@lists.xenproject.org, ian.jackson@citrix.com List-Id: xen-devel@lists.xenproject.org --===============6700256480039020101== Content-Type: multipart/alternative; boundary="000000000000746692058360a370" --000000000000746692058360a370 Content-Type: text/plain; charset="UTF-8" Sorry for the formatting. On Tue, 5 Mar 2019, 21:24 Stefano Stabellini, wrote: > On Sun, 3 Mar 2019, Amit Tomer wrote: > > Hi, > > > > > This series introduces a cacheability parameter for the iomem option, > so > > > that we can map an iomem region into a guest as cacheable memory. > > > > > > Then, this series fixes the way Xen handles reserved memory regions on > > > ARM: they should be mapped as normal memory, instead today they are > > > treated as device memory. > > > > > > > We tried testing this patch series on R-CAR platform but see following > crash > > when booting dom0 Linux. > > Thanks for testing! You might have found a real bug in the series. Could > you please also attach the full device tree? > Looking at the stack trace, this is very likely due to the issue I pointed out earlier on. I.e reserved-memory region should be described in the memory nodes. Cheers, > > > [ 0.577777] bd20: 0000000000000000 ffff000008b27fa0 > > ffffffffffffffff ffff000008b27000 > > [ 0.585639] bd40: ffff00000804bd50 ffff000008959164 > > [ 0.590565] [] cma_init_reserved_areas+0x98/0x1d0 > > [ 0.596876] [] do_one_initcall+0x38/0x120 > > [ 0.602493] [] kernel_init_freeable+0x188/0x228 > > [ 0.608628] [] kernel_init+0x10/0x100 > > [ 0.613898] [] ret_from_fork+0x10/0x18 > > [ 0.619250] ---[ end trace c2041e247871a6ff ]--- > > [ 0.623929] Unable to handle kernel paging request at virtual > > address ffff7dffe55c0000 > > [ 0.631880] Mem abort info: > > [ 0.634715] Exception class = DABT (current EL), IL = 32 bits > > [ 0.640684] SET = 0, FnV = 0 > > [ 0.643786] EA = 0, S1PTW = 0 > > [ 0.646990] Data abort info: > > [ 0.649920] ISV = 0, ISS = 0x00000006 > > [ 0.653821] CM = 0, WnR = 0 > > [ 0.656834] swapper pgtable: 4k pages, 48-bit VAs, pgd = > ffff000008b47000 > > [ 0.663670] [ffff7dffe55c0000] *pgd=0000000700aef803, > > *pud=0000000700af0803, *pmd=0000000000000000 > > [ 0.672652] Internal error: Oops: 96000006 [#1] PREEMPT SMP > > [ 0.678259] Modules linked in: > > [ 0.681371] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W > > 4.14.50-yocto-standard #1 > > [ 0.689923] Hardware name: Renesas Salvator-X board based on > > r8a7795 ES2.0+ (DT) > > [ 0.697355] task: ffff80001e910000 task.stack: ffff000008048000 > > [ 0.703317] PC is at cma_init_reserved_areas+0xbc/0x1d0 > > [ 0.708587] LR is at cma_init_reserved_areas+0x94/0x1d0 > > [ 0.713862] pc : [] lr : [] > > pstate: 60000045 > > [ 0.721287] sp : ffff00000804bd50 > > [ 0.724657] x29: ffff00000804bd50 x28: ffff000008a88a28 > > [ 0.730013] x27: 0000000000057000 x26: ffff000008994040 > > [ 0.735370] x25: ffff000008b27fa0 x24: ffff000008b27000 > > [ 0.740727] x23: ffff7e0000000000 x22: ffff0000088ed000 > > [ 0.746084] x21: 0000000000000000 x20: 0000000000000000 > > [ 0.751440] x19: 0000000000000004 x18: 0000000000000000 > > [ 0.756797] x17: 0000000000000001 x16: 00000000deadbeef > > [ 0.762154] x15: 0000000000000000 x14: 0000000000000400 > > [ 0.767511] x13: 0000000000000400 x12: 0000000000000000 > > [ 0.772872] x11: 0000000000000000 x10: 0000000000000002 > > [ 0.778224] x9 : 0000000000000000 x8 : ffff80001e945800 > > [ 0.783586] x7 : 0000000000000000 x6 : ffff000008b24868 > > [ 0.788938] x5 : ffff000008b24868 x4 : 0000000000000000 > > [ 0.794295] x3 : 0000000000000780 x2 : 0000000700000000 > > [ 0.799652] x1 : ffff000008a88a28 x0 : ffffffffe55c0000 > > [ 0.805010] Process swapper/0 (pid: 1, stack limit = > 0xffff000008048000) > > [ 0.811747] Call trace: > > [ 0.814254] Exception stack(0xffff00000804bc10 to 0xffff00000804bd50) > > [ 0.820734] bc00: > > ffffffffe55c0000 ffff000008a88a28 > > [ 0.828598] bc20: 0000000700000000 0000000000000780 > > 0000000000000000 ffff000008b24868 > > [ 0.836460] bc40: ffff000008b24868 0000000000000000 > > ffff80001e945800 0000000000000000 > > [ 0.844322] bc60: 0000000000000002 0000000000000000 > > 0000000000000000 0000000000000400 > > [ 0.852184] bc80: 0000000000000400 0000000000000000 > > 00000000deadbeef 0000000000000001 > > [ 0.860047] bca0: 0000000000000000 0000000000000004 > > 0000000000000000 0000000000000000 > > [ 0.867910] bcc0: ffff0000088ed000 ffff7e0000000000 > > ffff000008b27000 ffff000008b27fa0 > > [ 0.875772] bce0: ffff000008994040 0000000000057000 > > ffff000008a88a28 ffff00000804bd50 > > [ 0.883639] bd00: ffff000008959160 ffff00000804bd50 > > ffff000008959188 0000000060000045 > > [ 0.891497] bd20: 0000000000000000 ffff000008b27fa0 > > ffffffffffffffff ffff000008b27000 > > [ 0.899359] bd40: ffff00000804bd50 ffff000008959188 > > [ 0.904285] [] cma_init_reserved_areas+0xbc/0x1d0 > > [ 0.910592] [] do_one_initcall+0x38/0x120 > > [ 0.916209] [] kernel_init_freeable+0x188/0x228 > > [ 0.922343] [] kernel_init+0x10/0x100 > > [ 0.927613] [] ret_from_fork+0x10/0x18 > > [ 0.932975] Code: f94262c0 aa0103fc cb803360 d37ae400 (f8776800) > > [ 0.939104] ---[ end trace c2041e247871a700 ]--- > > [ 0.943800] Kernel panic - not syncing: Attempted to kill init! > > exitcode=0x0000000b > > [ 0.943800] > > [ 0.953021] SMP: stopping secondary CPUs > > [ 0.957009] ---[ end Kernel panic - not syncing: Attempted to kill > > init! exitcode=0x0000000b > > > > Below is how reserved node looks like: > > > > reserved-memory { > > #address-cells = <2>; > > #size-cells = <2>; > > ranges; > > > > /* device specific region for Lossy Decompression */ > > lossy_decompress: linux,lossy_decompress@54000000 { > > no-map; > > reg = <0x00000000 0x54000000 0x0 0x03000000>; > > }; > > > > /* For Audio DSP */ > > adsp_reserved: linux,adsp@57000000 { > > compatible = "shared-dma-pool"; > > reusable; > > reg = <0x00000000 0x57000000 0x0 0x01000000>; > > }; > > > > /* global autoconfigured region for contiguous > allocations */ > > linux,cma@58000000 { > > compatible = "shared-dma-pool"; > > reusable; > > reg = <0x00000000 0x58000000 0x0 0x18000000>; > > linux,cma-default; > > }; > > > > /* device specific region for contiguous allocations */ > > mmp_reserved: linux,multimedia@70000000 { > > compatible = "shared-dma-pool"; > > reusable; > > reg = <0x00000000 0x70000000 0x0 0x10000000>; > > }; > > }; > > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xenproject.org > https://lists.xenproject.org/mailman/listinfo/xen-devel --000000000000746692058360a370 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sorry for the formatting.

On Tue, 5 Mar 2019, 21:24 Stefano Stabellini, <sstabellini@kernel.org> wrote:

On Sun, 3 Mar 2019, Amit Tomer wrote:
> Hi,
>
> > This series introduces a cacheability parameter for the iomem opt= ion, so
> > that we can map an iomem region into a guest as cacheable memory.=
> >
> > Then, this series fixes the way Xen handles reserved memory regio= ns on
> > ARM: they should be mapped as normal memory, instead today they a= re
> > treated as device memory.
> >
>
> We tried testing this patch series on R-CAR platform but see following= crash
> when booting dom0 Linux.

Thanks for testing! You might have found a real bug in the series. Could you please also attach the full device tree?

Looking at the stack trace, this is very likely due to the issu= e I pointed out earlier on. I.e reserved-memory region should be described = in the memory nodes.

Cheers,

<= div class=3D"gmail_quote">

> [=C2=A0 =C2=A0 0.577777] bd20: 0000000000000000 ffff000008b27fa0
> ffffffffffffffff ffff000008b27000
> [=C2=A0 =C2=A0 0.585639] bd40: ffff00000804bd50 ffff000008959164
> [=C2=A0 =C2=A0 0.590565] [<ffff000008959164>] cma_init_reserved_= areas+0x98/0x1d0
> [=C2=A0 =C2=A0 0.596876] [<ffff000008083a50>] do_one_initcall+0x= 38/0x120
> [=C2=A0 =C2=A0 0.602493] [<ffff000008940d04>] kernel_init_freeab= le+0x188/0x228
> [=C2=A0 =C2=A0 0.608628] [<ffff0000086a6288>] kernel_init+0x10/0= x100
> [=C2=A0 =C2=A0 0.613898] [<ffff000008084c68>] ret_from_fork+0x10= /0x18
> [=C2=A0 =C2=A0 0.619250] ---[ end trace c2041e247871a6ff ]---
> [=C2=A0 =C2=A0 0.623929] Unable to handle kernel paging request at vir= tual
> address ffff7dffe55c0000
> [=C2=A0 =C2=A0 0.631880] Mem abort info:
> [=C2=A0 =C2=A0 0.634715]=C2=A0 =C2=A0Exception class =3D DABT (current= EL), IL =3D 32 bits
> [=C2=A0 =C2=A0 0.640684]=C2=A0 =C2=A0SET =3D 0, FnV =3D 0
> [=C2=A0 =C2=A0 0.643786]=C2=A0 =C2=A0EA =3D 0, S1PTW =3D 0
> [=C2=A0 =C2=A0 0.646990] Data abort info:
> [=C2=A0 =C2=A0 0.649920]=C2=A0 =C2=A0ISV =3D 0, ISS =3D 0x00000006
> [=C2=A0 =C2=A0 0.653821]=C2=A0 =C2=A0CM =3D 0, WnR =3D 0
> [=C2=A0 =C2=A0 0.656834] swapper pgtable: 4k pages, 48-bit VAs, pgd = =3D ffff000008b47000
> [=C2=A0 =C2=A0 0.663670] [ffff7dffe55c0000] *pgd=3D0000000700aef803, > *pud=3D0000000700af0803, *pmd=3D0000000000000000
> [=C2=A0 =C2=A0 0.672652] Internal error: Oops: 96000006 [#1] PREEMPT S= MP
> [=C2=A0 =C2=A0 0.678259] Modules linked in:
> [=C2=A0 =C2=A0 0.681371] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G=C2= =A0 =C2=A0 =C2=A0 =C2=A0 W
> 4.14.50-yocto-standard #1
> [=C2=A0 =C2=A0 0.689923] Hardware name: Renesas Salvator-X board based= on
> r8a7795 ES2.0+ (DT)
> [=C2=A0 =C2=A0 0.697355] task: ffff80001e910000 task.stack: ffff000008= 048000
> [=C2=A0 =C2=A0 0.703317] PC is at cma_init_reserved_areas+0xbc/0x1d0 > [=C2=A0 =C2=A0 0.708587] LR is at cma_init_reserved_areas+0x94/0x1d0 > [=C2=A0 =C2=A0 0.713862] pc : [<ffff000008959188>] lr : [<fff= f000008959160>]
> pstate: 60000045
> [=C2=A0 =C2=A0 0.721287] sp : ffff00000804bd50
> [=C2=A0 =C2=A0 0.724657] x29: ffff00000804bd50 x28: ffff000008a88a28 > [=C2=A0 =C2=A0 0.730013] x27: 0000000000057000 x26: ffff000008994040 > [=C2=A0 =C2=A0 0.735370] x25: ffff000008b27fa0 x24: ffff000008b27000 > [=C2=A0 =C2=A0 0.740727] x23: ffff7e0000000000 x22: ffff0000088ed000 > [=C2=A0 =C2=A0 0.746084] x21: 0000000000000000 x20: 0000000000000000 > [=C2=A0 =C2=A0 0.751440] x19: 0000000000000004 x18: 0000000000000000 > [=C2=A0 =C2=A0 0.756797] x17: 0000000000000001 x16: 00000000deadbeef > [=C2=A0 =C2=A0 0.762154] x15: 0000000000000000 x14: 0000000000000400 > [=C2=A0 =C2=A0 0.767511] x13: 0000000000000400 x12: 0000000000000000 > [=C2=A0 =C2=A0 0.772872] x11: 0000000000000000 x10: 0000000000000002 > [=C2=A0 =C2=A0 0.778224] x9 : 0000000000000000 x8 : ffff80001e945800 > [=C2=A0 =C2=A0 0.783586] x7 : 0000000000000000 x6 : ffff000008b24868 > [=C2=A0 =C2=A0 0.788938] x5 : ffff000008b24868 x4 : 0000000000000000 > [=C2=A0 =C2=A0 0.794295] x3 : 0000000000000780 x2 : 0000000700000000 > [=C2=A0 =C2=A0 0.799652] x1 : ffff000008a88a28 x0 : ffffffffe55c0000 > [=C2=A0 =C2=A0 0.805010] Process swapper/0 (pid: 1, stack limit =3D 0x= ffff000008048000)
> [=C2=A0 =C2=A0 0.811747] Call trace:
> [=C2=A0 =C2=A0 0.814254] Exception stack(0xffff00000804bc10 to 0xffff0= 0000804bd50)
> [=C2=A0 =C2=A0 0.820734] bc00:
> ffffffffe55c0000 ffff000008a88a28
> [=C2=A0 =C2=A0 0.828598] bc20: 0000000700000000 0000000000000780
> 0000000000000000 ffff000008b24868
> [=C2=A0 =C2=A0 0.836460] bc40: ffff000008b24868 0000000000000000
> ffff80001e945800 0000000000000000
> [=C2=A0 =C2=A0 0.844322] bc60: 0000000000000002 0000000000000000
> 0000000000000000 0000000000000400
> [=C2=A0 =C2=A0 0.852184] bc80: 0000000000000400 0000000000000000
> 00000000deadbeef 0000000000000001
> [=C2=A0 =C2=A0 0.860047] bca0: 0000000000000000 0000000000000004
> 0000000000000000 0000000000000000
> [=C2=A0 =C2=A0 0.867910] bcc0: ffff0000088ed000 ffff7e0000000000
> ffff000008b27000 ffff000008b27fa0
> [=C2=A0 =C2=A0 0.875772] bce0: ffff000008994040 0000000000057000
> ffff000008a88a28 ffff00000804bd50
> [=C2=A0 =C2=A0 0.883639] bd00: ffff000008959160 ffff00000804bd50
> ffff000008959188 0000000060000045
> [=C2=A0 =C2=A0 0.891497] bd20: 0000000000000000 ffff000008b27fa0
> ffffffffffffffff ffff000008b27000
> [=C2=A0 =C2=A0 0.899359] bd40: ffff00000804bd50 ffff000008959188
> [=C2=A0 =C2=A0 0.904285] [<ffff000008959188>] cma_init_reserved_= areas+0xbc/0x1d0
> [=C2=A0 =C2=A0 0.910592] [<ffff000008083a50>] do_one_initcall+0x= 38/0x120
> [=C2=A0 =C2=A0 0.916209] [<ffff000008940d04>] kernel_init_freeab= le+0x188/0x228
> [=C2=A0 =C2=A0 0.922343] [<ffff0000086a6288>] kernel_init+0x10/0= x100
> [=C2=A0 =C2=A0 0.927613] [<ffff000008084c68>] ret_from_fork+0x10= /0x18
> [=C2=A0 =C2=A0 0.932975] Code: f94262c0 aa0103fc cb803360 d37ae400 (f8= 776800)
> [=C2=A0 =C2=A0 0.939104] ---[ end trace c2041e247871a700 ]---
> [=C2=A0 =C2=A0 0.943800] Kernel panic - not syncing: Attempted to kill= init!
> exitcode=3D0x0000000b
> [=C2=A0 =C2=A0 0.943800]
> [=C2=A0 =C2=A0 0.953021] SMP: stopping secondary CPUs
> [=C2=A0 =C2=A0 0.957009] ---[ end Kernel panic - not syncing: Attempte= d to kill
> init! exitcode=3D0x0000000b
>
> Below is how reserved node looks like:
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 reserved-memory {
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 #address= -cells =3D <2>;
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 #size-ce= lls =3D <2>;
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 ranges;<= br> >
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 /* devic= e specific region for Lossy Decompression */
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 lossy_de= compress: linux,lossy_decompress@54000000 {
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 no-map;
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 reg =3D <0x00000000 0x54000000 0x0 0x03000000>;<= br> >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 };
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 /* For A= udio DSP */
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 adsp_res= erved: linux,adsp@57000000 {
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 compatible =3D "shared-dma-pool";
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 reusable;
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 reg =3D <0x00000000 0x57000000 0x0 0x01000000>;<= br> >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 };
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 /* globa= l autoconfigured region for contiguous allocations */
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 linux,cm= a@58000000 {
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 compatible =3D "shared-dma-pool";
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 reusable;
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 reg =3D <0x00000000 0x58000000 0x0 0x18000000>;<= br> >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 linux,cma-default;
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 };
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 /* devic= e specific region for contiguous allocations */
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 mmp_rese= rved: linux,multimedia@70000000 {
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 compatible =3D "shared-dma-pool";
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 reusable;
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 = =C2=A0 =C2=A0 =C2=A0 reg =3D <0x00000000 0x70000000 0x0 0x10000000>;<= br> >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 };
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 };
>

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