Re: [Xen-devel] [PATCH 4/8] xen/pvh: Bootstrap PVH guest

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 10/14/2016 02:38 PM, Andrew Cooper wrote:
>> +    jmp *%rax
>> +
>> +#else /* CONFIG_X86_64 */
>> +
>> +    call setup_pgtable_32
>> +
>> +    mov $_pa(initial_page_table), %eax
>> +    movl %eax, %cr3
>> +
>> +    movl %cr0, %eax
>> +    orl $(X86_CR0_PG | X86_CR0_PE), %eax
>> +    movl %eax, %cr0
>> +
>> +    ljmp $__BOOT_CS,$1f
>> +1:
>> +    call xen_prepare_pvh
> Why does xen_prepare_pvh need paging?  I can't spot anything which
> should need it, and it feels conceptually wrong.

xen_prepare_pvh() deals with virtual addresses. How can we run without paging?

(Also, startup_64, which is where we jump from here in 64-bit mode expects 
paging to be on).

-boris



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