[Xen-devel] [PATCH][SVM] HVM fix for SWINT event injection

["Woller, Thomas" <thomas.woller@xxxxxxx>]

This patch resolves issues with booting/installing AMD-V HVM guests,
including 32bit win2000, and 64bit vista/longhorn guests on
xen-unstable.

This patch modifies the AMD-V reinjection logic (intr.c) to not inject
any SWINT that the processor was unable to execute (exitintinfo valid w/
type=4).  The processor indicates that a SWINT was unsuccessful by
filling in the exitintinfo field on an #PF intercept, during a world
switch from SVM/guest mode.  

There were several cases observed during boot of win2000 and
vista/longhorn 64b:

Win2000 -
A VMEXIT_EXCEPTION_PF (#PF intercept) occurs during execution of an "Int
10" instruction.  
The exitintinfo field is properly filled out by the processor containing
type=4/vector=0x10.
The call into paging_fault() to handle the #PF is not resolved
(not_a_shadow_fault/0 returned), so the eventinj information is filled
out in the #PF vmexit handler (to inject later).
The svm_intr_assist() code is executed with both the eventinj, and the
exitininfo fields filled out.
In this case the #PF needs to be injected, ignoring the SWINT in the
exitintinfo fields.

Vista/Longhorn 64b -
Similar to above, but the call into paging_fault() is resolved
(EXCRET_fault_fixed returned), and in this case the SWINT in exitintifo
should also be ignored.

Please apply to xen-unstable.
Applies cleanly to c/s 15651.
Signed-off-by Tom Woller <thomas.woller@xxxxxxx> 

Note that HVM guests will not boot on AMD-V with xen-staging.hg c/s
15652.  
Keir, do you want me to take a look at staging c/s 15652 on AMD-V w/
HVM?

  --Tom

thomas.woller@xxxxxxx  +1-512-602-0059
AMD Corporation - Operating Systems Research Center
5204 E. Ben White Blvd. UBC1
Austin, Texas 78741

svm_inj_fix_for_hvm_15651.patch
Description: svm_inj_fix_for_hvm_15651.patch

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