Re: [Xen-devel] [PATCH] acpi: do not flush cache if cx->type != ACPI_STATE_C3

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 12.04.12 at 19:05, Steven <wangwangkang@xxxxxxxxx> wrote:
> Hi, Wei,
> I have read you slides in xen summit 2007 about NPT in AMD, "AMD
> Barcelona and Nested Paging Support in Xen".
> However, I have some question regarding the nested page walk in your slide 
> 8.

Please do not hijack threads for unrelated topics; create new ones
instead.

Jan

> In your slide 8, the first step is to get gPA from get_PML4(gCR3,gVA).
> I assume that it use the [47:39] bit of gVA.
> However, in another AMD white paper, "AMD-VTM Nested Paging".
> http://developer.amd.com/assets/NPT-WP-1%201-final-TM.pdf 
> In its figure 4, I saw that the first step is to translate gCR3 using
> nested page walk and then combine with the gVA[47:39] to read the
> table entry.
> 
> These two documents look having different order of reading the guest
> page table. In the slides, it first get_PML4. But in the white paper,
> it first does nested page walk.
> I am wondering which one is true. Thanks.
> 
> - ha
> 
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