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Re: [Xen-devel] [PATCH 0/6] iomem cacheability
Sorry for the formatting.
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] [<ffff000008959164>] cma_init_reserved_areas+0x98/0x1d0
> [ 0.596876] [<ffff000008083a50>] do_one_initcall+0x38/0x120
> [ 0.602493] [<ffff000008940d04>] kernel_init_freeable+0x188/0x228
> [ 0.608628] [<ffff0000086a6288>] kernel_init+0x10/0x100
> [ 0.613898] [<ffff000008084c68>] 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 : [<ffff000008959188>] lr : [<ffff000008959160>]
> 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] [<ffff000008959188>] cma_init_reserved_areas+0xbc/0x1d0
> [ 0.910592] [<ffff000008083a50>] do_one_initcall+0x38/0x120
> [ 0.916209] [<ffff000008940d04>] kernel_init_freeable+0x188/0x228
> [ 0.922343] [<ffff0000086a6288>] kernel_init+0x10/0x100
> [ 0.927613] [<ffff000008084c68>] 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>;
> };
> };
>
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