When a guest OS writes to a shadowed (and therefore page protected)
guest page table, does the resulting page fault get handled in
paging_tmpl.h:xxx_page_fault or does it call some rmap related code
directly? Also, what does the "direct" mmu page role mean?
Thanks!
Marek
Avi Kivity wrote:
On 03/19/2010 01:50 AM, Marek Olszewski wrote:
When using VMX without EPT, is it ever possible for a guest to
receive a page fault without it first appearing (and being
reinjected) in KVM?
Yes. On Intel hosts only, and controlled by bypass_guest_pf.
I'm seeing some strange behavior where accesses to mprotected (but
yet to be accessed) memory causes a fault in the guest OS, that I
cannot see KVM intercepting.
Look for 'shadow_trap_nonpresent_pte' (which will trap into kvm) and
'shadow_notrap_nonpresent_pte' (which will not) in the code.
--
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
