Re: [Xen-devel] [PATCH v2 7/9] x86/shadow: Use the pagewalk reserved bits helpers

2017-03-23 Thread Tim Deegan
At 16:31 + on 16 Mar (1489681901), Andrew Cooper wrote: > The shadow logic should not create a valid/present shadow of a guest PTE which > contains reserved bits from the guests point of view. It is not guaranteed > that the hardware pagewalk will come to the same conclusion, and raise a >

Re: [Xen-devel] [PATCH v2 7/9] x86/shadow: Use the pagewalk reserved bits helpers

2017-03-20 Thread Jan Beulich
>>> On 16.03.17 at 17:31, wrote: > The shadow logic should not create a valid/present shadow of a guest PTE which > contains reserved bits from the guests point of view. It is not guaranteed > that the hardware pagewalk will come to the same conclusion, and raise a >

Re: [Xen-devel] [PATCH v2 7/9] x86/shadow: Use the pagewalk reserved bits helpers

2017-03-16 Thread Andrew Cooper
On 16/03/17 16:31, Andrew Cooper wrote: > The shadow logic should not create a valid/present shadow of a guest PTE which > contains reserved bits from the guests point of view. It is not guaranteed > that the hardware pagewalk will come to the same conclusion, and raise a > pagefault. > > Shadows

[Xen-devel] [PATCH v2 7/9] x86/shadow: Use the pagewalk reserved bits helpers

2017-03-16 Thread Andrew Cooper
The shadow logic should not create a valid/present shadow of a guest PTE which contains reserved bits from the guests point of view. It is not guaranteed that the hardware pagewalk will come to the same conclusion, and raise a pagefault. Shadows created on demand from the pagefault handler are