Re: [Minios-devel] [UNIKRAFT PATCH 7/9] plat/kvm: update page table for Firecracker

["Haibo Xu (Arm Technology China)" <Haibo.Xu@xxxxxxx>]

This patch looks good.

Reviewed-by: Haibo Xu <haibo.xu@xxxxxxx>

On 2019/6/3 22:56, Florian Schmidt wrote:
> Firecracker needs other low memory addresses to access information
> passed in by the hypervisor.
>
> Signed-off-by: Florian Schmidt <florian.schmidt@xxxxxxxxx>
> ---
>  plat/kvm/x86/pagetable.S | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/plat/kvm/x86/pagetable.S b/plat/kvm/x86/pagetable.S
> index d200a13a..4693690d 100644
> --- a/plat/kvm/x86/pagetable.S
> +++ b/plat/kvm/x86/pagetable.S
> @@ -38,12 +38,24 @@
>  .align 0x1000
>  cpu_zeropt:
>       /* the first 1M is inaccessible, except for:
> -        0x09000 - 0x09fff -> multiboot info @ 0x09500 (read-only)
> +        0x07000 - 0x07fff -> bootparams info (RO, Firecracker)
> +        0x09000 - 0x09fff -> multiboot info @ 0x09500 (RO, QEMU)
> +        0x20000 - 0x20fff -> bootparams cmdline (RO, Firecracker)
>          0xb8000 - 0xbffff -> VGA buffer (read+write)
>        */
> +#if KVMQPLAT
>       .fill 0x9, 0x8, 0x0
>       .quad 0x0000000000009000 + PAGETABLE_RO
>       .fill 0xae, 0x8, 0x0
> +#elif KVMFCPLAT
> +     .fill 0x7, 0x8, 0x0
> +     .quad 0x0000000000007000 + PAGETABLE_RO
> +     .fill 0x18, 0x8, 0x0
> +     .quad 0x0000000000020000 + PAGETABLE_RO
> +     .fill 0x97, 0x8, 0x0
> +#else
> +     .fill 0xb8, 0x8, 0x0
> +#endif /* first area until 0xb7fff */
>       .quad 0x00000000000b8000 + PAGETABLE_RW
>       .quad 0x00000000000b9000 + PAGETABLE_RW
>       .quad 0x00000000000ba000 + PAGETABLE_RW
>
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