Re: Discussion of Xenheap problems on AArch64

[Julien Grall <julien@xxxxxxx>]

Hi Henry,

On 07/05/2021 05:06, Henry Wang wrote:
> > From: Julien Grall <julien@xxxxxxx>
> > On 28/04/2021 10:28, Henry Wang wrote:
> > > Hi Julien,
> > Hi Henry,
> >
> > > I've done some test about the patch series in
> > > https://xenbits.xen.org/gitweb/?p=people/julieng/xen-
> > unstable.git;a=shortlog;h=refs/heads/pt/rfc-v2
> > >
> > Thanks you for the testing. Some questions below.
> >
> > I am a bit confused with the output with and without my patches. Both of
> > them are showing a data abort in clear_page().
> >
> > Above, you suggested that there is a big gap between the two memory
> > banks. Are the banks still point to actual RAM?
> Another sorry for the very late reply, we had a 5 day public holiday in
> China and it also took me some time to figure out how to configure the
> FVP (it turned out I have to set -C bp.secure_memory=false to access
> some parts of memory higher than 4G).
No worries. I never tried to tweak the memory layout on the FVP before. 
It is good to know it can be done to properly test memory issue :).
[...]

> when I continue booting Xen, I got following error log:
>
> (XEN) CPU:    0
> (XEN) PC:     00000000002b5a5c alloc_boot_pages+0x94/0x98
> (XEN) LR:     00000000002ca3bc
> (XEN) SP:     00000000002ffde0
> (XEN) CPSR:   600003c9 MODE:64-bit EL2h (Hypervisor, handler)
> (XEN)
> (XEN)   VTCR_EL2: 80000000
> (XEN)  VTTBR_EL2: 0000000000000000
> (XEN)
> (XEN)  SCTLR_EL2: 30cd183d
> (XEN)    HCR_EL2: 0000000000000038
> (XEN)  TTBR0_EL2: 000000008413c000
> (XEN)
> (XEN)    ESR_EL2: f2000001
> (XEN)  HPFAR_EL2: 0000000000000000
> (XEN)    FAR_EL2: 0000000000000000
> (XEN)
> (XEN) Xen call trace:
> (XEN)    [<00000000002b5a5c>] alloc_boot_pages+0x94/0x98 (PC)
> (XEN)    [<00000000002ca3bc>] setup_frametable_mappings+0xa4/0x108 (LR)
> (XEN)    [<00000000002ca3bc>] setup_frametable_mappings+0xa4/0x108
> (XEN)    [<00000000002cb988>] start_xen+0x344/0xbcc
> (XEN)    [<00000000002001c0>] arm64/head.o#primary_switched+0x10/0x30
> (XEN)
> (XEN) ****************************************
> (XEN) Panic on CPU 0:
> (XEN) Xen BUG at page_alloc.c:432
> (XEN) ****************************************
This is happening without my patch series applied, right? If so, what 
happen if you apply it?
Cheers,

--
Julien Grall