Re: Current staging crashes on boot on an AMD EPYC 7251

["Jan Beulich" <JBeulich@suse.com>]

>>> On 21.09.18 at 12:15, <roger.pau@citrix.com> wrote:
> On Fri, Sep 21, 2018 at 12:45:18PM +0300, Razvan Cojocaru wrote:
>> While doing my best to make sure what I understand to be George's
>> proposed changes for the altp2m series I've tried to boot Xen staging on
>> an AMD host, but it crashes in an unrelated place (I've tested this by
>> stashing my changes and booting a "vanilla" staging):
> 
> Can you apply the following debug patch and paste the full boot log?

Well, not having provided the full boot log right away is clearly
unhelpful, as from that alone we should be able to tell what's
going on here (unless we e.g. screw up the E820 map somewhere).
However, it is already clear that ...

> --- a/xen/arch/x86/mm.c
> +++ b/xen/arch/x86/mm.c
> @@ -465,6 +465,8 @@ unsigned int page_get_ram_type(mfn_t mfn)
>              break;
>  
>          default:
> +printk("[%#lx, %#lx) type: %u\n", e820.map[i].addr,
> +       e820.map[i].addr + e820.map[i].size, e820.map[i].type);
>              ASSERT_UNREACHABLE();

... this assertion needs to go away, as it would trigger for both
E820_TYPE_PMEM and E820_TYPE_PRAM (using the Linux
naming), or the unnamed type 6 mentioned in their header. It
would also trigger for types which may get added down the road.

Jan



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