Gerd Hoffmann wrote:
On 05/24/09 14:07, Avi Kivity wrote:
I agree however that the Xen hypercall page protocol has no business in
kvm.ko. But can't we implement it in emu? Xenner conveniently places a
ring 0 stub in the guest, we could trap the MSR there and emulate it
entirely in the guest.
No. The case where handling the msr writes is needed is the pv-on-hvm
driver support. For pv kernels it could be handled by emu if it would
be needed, but pv kernels don't need the msr stuff in the first place.
There should be a longish mail about that in the list archive ...
Yes, I forgot.
Device drivers have no business writing to cpu model specific
registers. I hate to bring that fugliness to kvm but I do want to
support Xen guests.
It should have been implemented as mmio. Maybe implement an ioctl that
converts rdmsr/wrmsr to equivalent mmios?
struct kvm_msr_mmio {
__u32 msr;
__u32 nr;
__u64 mmio;
__u32 flags;
__u32 pad[3];
}
In any case it should reject the standard msr ranges to prevent Alex
from implementing cpu emulation in userspace.
--
error compiling committee.c: too many arguments to function
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
