Re: [Xen-devel] AMD VMMCALL and VM86 mode

2017-01-02 Thread Andrew Cooper
On 25/12/2016 07:47, Suravee Suthikulpanit wrote: > > > On 12/12/16 01:37, Andrew Cooper wrote: >> On 11/12/16 17:33, Boris Ostrovsky wrote: >>> - andrew.coop...@citrix.com wrote: >>> On 09/12/16 19:55, Andrew Cooper wrote: > On 09/12/16 19:55, Boris Ostrovsky wrote: >> On

Re: [Xen-devel] AMD VMMCALL and VM86 mode

2016-12-24 Thread Suravee Suthikulpanit
On 12/12/16 01:37, Andrew Cooper wrote: On 11/12/16 17:33, Boris Ostrovsky wrote: - andrew.coop...@citrix.com wrote: On 09/12/16 19:55, Andrew Cooper wrote: On 09/12/16 19:55, Boris Ostrovsky wrote: On 12/09/2016 02:01 PM, Andrew Cooper wrote: Hello, While working on XSA-192, I

Re: [Xen-devel] AMD VMMCALL and VM86 mode

2016-12-12 Thread Suravee Suthikulpanit
Hi Andrew/Boris, On 12/12/16 01:37, Andrew Cooper wrote: On 11/12/16 17:33, Boris Ostrovsky wrote: - andrew.coop...@citrix.com wrote: On 09/12/16 19:55, Andrew Cooper wrote: On 09/12/16 19:55, Boris Ostrovsky wrote: On 12/09/2016 02:01 PM, Andrew Cooper wrote: Hello, While working on

Re: [Xen-devel] AMD VMMCALL and VM86 mode

2016-12-11 Thread Andrew Cooper
On 11/12/16 17:33, Boris Ostrovsky wrote: > - andrew.coop...@citrix.com wrote: > >> On 09/12/16 19:55, Andrew Cooper wrote: >>> On 09/12/16 19:55, Boris Ostrovsky wrote: On 12/09/2016 02:01 PM, Andrew Cooper wrote: > Hello, > > While working on XSA-192, I found a curious

Re: [Xen-devel] AMD VMMCALL and VM86 mode

2016-12-11 Thread Boris Ostrovsky
- andrew.coop...@citrix.com wrote: > On 09/12/16 19:55, Andrew Cooper wrote: > > On 09/12/16 19:55, Boris Ostrovsky wrote: > >> On 12/09/2016 02:01 PM, Andrew Cooper wrote: > >>> Hello, > >>> > >>> While working on XSA-192, I found a curious thing. On AMD > hardware, the > >>> VMMCALL

Re: [Xen-devel] AMD VMMCALL and VM86 mode

2016-12-10 Thread Andrew Cooper
On 09/12/16 19:55, Andrew Cooper wrote: > On 09/12/16 19:55, Boris Ostrovsky wrote: >> On 12/09/2016 02:01 PM, Andrew Cooper wrote: >>> Hello, >>> >>> While working on XSA-192, I found a curious thing. On AMD hardware, the >>> VMMCALL instruction appears to behave like a nop if executed in VM86

Re: [Xen-devel] AMD VMMCALL and VM86 mode

2016-12-09 Thread Andrew Cooper
On 09/12/16 19:55, Boris Ostrovsky wrote: > On 12/09/2016 02:01 PM, Andrew Cooper wrote: >> Hello, >> >> While working on XSA-192, I found a curious thing. On AMD hardware, the >> VMMCALL instruction appears to behave like a nop if executed in VM86 >> mode. All other processor modes work fine.

Re: [Xen-devel] AMD VMMCALL and VM86 mode

2016-12-09 Thread Boris Ostrovsky
On 12/09/2016 02:01 PM, Andrew Cooper wrote: > Hello, > > While working on XSA-192, I found a curious thing. On AMD hardware, the > VMMCALL instruction appears to behave like a nop if executed in VM86 > mode. All other processor modes work fine. > > The documentation suggests it should be valid

[Xen-devel] AMD VMMCALL and VM86 mode

2016-12-09 Thread Andrew Cooper
Hello, While working on XSA-192, I found a curious thing. On AMD hardware, the VMMCALL instruction appears to behave like a nop if executed in VM86 mode. All other processor modes work fine. The documentation suggests it should be valid in any situation, but I never get a #VMEXIT from it.