Re: [Xen-devel] [Bug] 4.12 kernel dom0 always reboot on xen 4.9 efi

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Aug 10, 2017 at 11:09:20AM +0000, Zhang, Xiong Y wrote:
> On my SKL/KBL machine,  upstream 4.12 kernel dom0 couldn't boot up using 
> xen.efi which is xen 4.9
> 
> 
> (1)     Upstream 4.11 kernel doesn't have such issue.
> 
> (2)     Upstream 4.12 kernel on my native uefi machine could boot up.
> 
> After some debug, I have some finding:
> firmware/efi.c: Reinit efi global variable
> 
>     efi is a global variable, some of efi members is initialized to
> INVALID_TABLE_ADDR when efi is defined. But efi is zero when
> setup_arch() begin running for unknown reason.
> 
>     This patch set it again to avoid kernel panic. This fix 4.12 kernel dom0
>     couldn't boot up on xen.efi 4.9.
> 
> diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
> index b372aad..27bbcb4 100644
> --- a/drivers/firmware/efi/efi.c
> +++ b/drivers/firmware/efi/efi.c
> @@ -474,6 +474,9 @@ int __init efi_config_parse_tables(void *config_tables, 
> int count, int sz,
>         void *tablep;
>         int i;
> 
> +       efi.mps = efi.acpi = efi.acpi20 = efi.smbios = efi.smbios3 = 
> efi.sal_systab =
> +       efi.boot_info = efi.hcdp = efi.uga = efi.uv_systab = efi.fw_vendor =
> +       efi.esrt= efi.properties_table = efi.rng_seed = efi.mem_attr_table = 
> EFI_INVALID_TABLE_ADDR;
> 
> why efi is zero at setup_arch() begin running ? who will clear it ?

See arch/x86/xen/efi.c
> 
> thanks

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