Displaying 5 results from an estimated 5 matches for "guest_walk_t".
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2007 Jul 02
3
Walking an HVM''s shadow page tables and other memory management questions.
...9;'s page table to obtain the PFN. I am building
the hypervisor by simply typing "make xen" without any other
configuration changes from a default source installation.
The first problem I encountered is that it appears the code assumes the
guest to be in PAE mode. In particular, guest_walk_tables() in
xen/arch/x86/mm/shadow/multi.c, line 252 has this code snippet:
#else /* PAE only... */
/* Get l3e from the cache of the guest''s top level table */
gw->l3e = (guest_l3e_t
*)&v->arch.shadow.gl3e[guest_l3_table_offset(va)];
#endif /* PAE or 64... */
Whi...
2008 Feb 21
2
[PATCH][RFC]Remove lock on first guest table walk
Just found this patch in house which I thought sent out
already. :-)
Still one thing remaining is to special case for UP guest
which suffers overhead from this change...
----
Remove lock on first guest table walk
Existing shadow fault path grabs big lock before walking
guest tables, to ensure consistency with shadow content
lest concurrent change from other vcpu in a bad OS.
But this lock
2008 Feb 22
3
FW: [PATCH][UPDATE]Remove lock on guest table walk
...idea seems sound, and avoids the shadow lock altogether on a
>bunch more pagefaults, which is nice.
>
>I think that since PV pagetables are guaranteed to be read-only above
>l1e, the guest_map_l1e and guest_get_eff_l1e functions can be
>allowed to
>drop the shadow lock and call guest_walk_tables with shadow_op == 0.
>That would mean that there are no callers left setting shadow_op to 1,
>and then the shadow_op argument (and the whole mechanism for calling
>remove_write_access from guest_walk_tables) could be removed.
Thanks for clarification.
>
>I think that in guest_...
2009 Aug 26
6
can dom0 modify Shadow PT of HVM domU?
Hi all,
Can Xen hypervisor modify HVM domU's Shadow page table, under the dom0's context, like trapped from dom0's hypercall?
I think it have to call 2 functions at least: guest_walk_tables() and flush_tlb_all(). Can these 2 functions called in dom0's context?
In my test, if hypervisor tries to modify HVM's shadow page table, it will bring down the whole system. I am not sure what's the reason.
Thanks,
Wu
_______________________________________________
Xen-devel ma...
2012 Dec 10
26
[PATCH 00/11] Add virtual EPT support Xen.
From: Zhang Xiantao <xiantao.zhang@intel.com>
With virtual EPT support, L1 hyerpvisor can use EPT hardware
for L2 guest''s memory virtualization. In this way, L2 guest''s
performance can be improved sharply. According to our testing,
some benchmarks can show > 5x performance gain.
Signed-off-by: Zhang Xiantao <xiantao.zhang@intel.com>
Zhang Xiantao (11):