Re: [PATCH 5/9] apm32: remove paravirt_enabled() use

[Boris Ostrovsky]

On 02/19/2016 08:08 AM, Luis R. Rodriguez wrote:
> There is already a check for apm_info.bios == 0, the
> apm_info.bios is set from the boot_params.apm_bios_info.
> Both Xen and lguest, which are also the only ones that set
> paravirt_enabled to true) do never set the apm_bios_info,
> the paravirt_enabled() check is simply not needed.

We need to guarantee that boot_params is filled with zeroes. On 
baremetal path we clear .bss (which is where boot_params live) before 
copying data from zero page.

So we need to at least memset(&boot_params, 0, sz) in 
xen_start_kernel(). Better yet, clear whole .bss.

(This applies to the next patch as well).

-boris