Gerd Hoffmann wrote:
Avi Kivity wrote:
Gerd Hoffmann wrote:
Hi,
I've just noticed that xenner doesn't work for 64bit xen guest kernels
on my new shiny barcelona box. The VM crashes when trying to access the
lapic. lapic setup is done before idt setup, register dump looks like
init state, thus it most likely is a triple fault resetting the vcpu.
Turning off npt fixes it.
xenner maps the lapic to ffff820000000000 (64bit guests) or fe900000
(32bit guests). 32bit works fine even with npt enabled.
host kernel is fedora 9 with kvm-69 modules.
ideas anyone?
Turn on logging in lapic.c. See if something turns up.
If not, the page tables are probably set up incorrectly, but in a way
that kvm doesn't notice.
Figured meanwhile the instruction accessing the lapic register somehow
beames me into my gpf handler. With a quite strange rsp value. Hmm.
To be analyzed further after kvm forum I guess, unless someone has a
bright idea ...
x86-64 will gpf if an address is not canonical. ffff820000000000 is
canonical, but perhaps a type killed a zero somewhere?
--
Do not meddle in the internals of kernels, for they are subtle and quick to
panic.
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
