Re: [Xen-devel] hvm_copy_from_guest_virt

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 11/09/2009 03:26, "Wu Bingzheng" <wubingzheng@xxxxxxx> wrote:

> In Xen 3.3.0, hvm's shadow page fault handler: sh_page_fault():
> I call 'hvm_copy_from_guest_virt' to read some guest's (Windows XP) memory.
> If I read user space, it works fine.
> If I read kernel space, like 0x8xxxxxxx or 0xFxxxxxxx, it retures
> HVMCOPY_bad_gva_to_gfn.
> I am sure that the page I read is present in guest's page table.
> 
> Can I copy memory from kernel space?

Yes. Either the pages are not present in the pagetable, or you passed
PFEC_user_mode flag in the fourth argument to hvm_copy_from_guest_virt().

 -- Keir



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