[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] [PATCH] support 1gb pages in guest page table walker

On 07/25/11 12:30, Tim Deegan wrote:
At 11:25 +0100 on 25 Jul (1311593146), Tim Deegan wrote:
Also this function should be called from the CPUID trap handler to make
sure we never advertise PSE1GB when we're not going to support it.

Er, not this function exactly, since CPUID should report the feature
even when the guest's not in long_mode.  I think it needs a
hvm_pse1G_supported that can be called from CPUID, and then
guest_supports_1G_superpages() boils down to
"(GUEST_PAGING_LEVEL>= 4)&&  hvm_pse1G_supported(v)"

New version attached. I removed the fake l1e calculation.
Something is still wrong: The l2 guest kernel crashes with
an unexpected null pointer derefencing but it boots w/o
this patch.

Is it a problem when l1 guest uses 1gb pages where the host
uses 4k or 2m pages?


---to satisfy European Law for business letters:
Advanced Micro Devices GmbH
Einsteinring 24, 85689 Dornach b. Muenchen
Geschaeftsfuehrer: Alberto Bozzo, Andrew Bowd
Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen
Registergericht Muenchen, HRB Nr. 43632

Attachment: xen_pagewalk.diff
Description: xen_pagewalk.diff

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.