Re: [PATCH] Xen PV-on-HVM guest support (v2)

2009-10-15 Thread Avi Kivity
On 10/15/2009 02:41 PM, Ed Swierk wrote: Support for Xen PV-on-HVM guests can be implemented almost entirely in userspace, except for handling one annoying MSR that maps a Xen hypercall blob into guest address space. A generic mechanism to delegate MSR writes to userspace seems overkill and

Re: [PATCH] Xen PV-on-HVM guest support (v2)

2009-10-15 Thread Jan Kiszka
Ed Swierk wrote: Support for Xen PV-on-HVM guests can be implemented almost entirely in userspace, except for handling one annoying MSR that maps a Xen hypercall blob into guest address space. A generic mechanism to delegate MSR writes to userspace seems overkill and risks encouraging

Re: [PATCH] Xen PV-on-HVM guest support (v2)

2009-10-15 Thread Gerd Hoffmann
Hi, Is the msr number really variable? Isn't it an ABI? Yes, it is variable. The guests gets the msr number via cpuid ... Do we need support for reading the msr? I don't think so. cheers, Gerd -- To unsubscribe from this list: send the line unsubscribe kvm in the body of a message

Re: [PATCH] Xen PV-on-HVM guest support (v2)

2009-10-15 Thread Avi Kivity
On 10/15/2009 05:11 PM, Gerd Hoffmann wrote: Hi, Is the msr number really variable? Isn't it an ABI? Yes, it is variable. The guests gets the msr number via cpuid ... Do we need support for reading the msr? I don't think so. Thanks. So Ed, I think you're good to go, but please

[PATCH] Xen PV-on-HVM guest support (v2)

2009-10-14 Thread Ed Swierk
Support for Xen PV-on-HVM guests can be implemented almost entirely in userspace, except for handling one annoying MSR that maps a Xen hypercall blob into guest address space. A generic mechanism to delegate MSR writes to userspace seems overkill and risks encouraging similar MSR abuse in the