Re: XenServer and viridian

["Mathew, Cherry G." <c%bow.st@localhost>]

>>>>> On Thu, 27 Mar 2025 11:12:24 +0000 (GMT), Stephen Borrill <netbsd%precedence.co.uk@localhost> said:

> On Thu, 27 Mar 2025, Manuel Bouyer wrote:

[...]

>> 
>> So my guess is that it's failing in xen_init_hypercall_page(),
>> when doing:
>> wrmsr(descs[1], (uintptr_t)&hypercall_page - KERNBASE);
>> 
>> this means that when booting in this mode, the Xen interfaces are not
>> available to the guest.

IIRC there were two mechanisms to access Xen - one that was primarily
used with PV mode (a shared table of info/trampoline code) and a more
structured path for PVH iirc.

Again, pretty vague comments from dated memory.

HTH,
-- 
Math/(~cherry)