Andrew Morton wrote:
How important is this feature to KVM?
Very. kvm pins pages that are referenced by the guest; a 64-bit guest
will easily pin its entire memory with the kernel map. So this is
critical for guest swapping to actually work.
Other nice features like page migration are
Hollis Blanchard wrote:
On Wed, 2008-02-13 at 08:58 +0200, Avi Kivity wrote:
It'll need to be built against your kernel tree; please provide a URL.
curl http://penguinppc.org/~hollisb/kvm/kvm-powerpc.mbox | git-am
Unfortunately I wasn't able to get an F8 ppc rescue cd ISO to
On Sat, 16 Feb 2008 10:45:50 +0200 Avi Kivity [EMAIL PROTECTED] wrote:
Andrew Morton wrote:
How important is this feature to KVM?
Very. kvm pins pages that are referenced by the guest;
hm. Why does it do that?
a 64-bit guest
will easily pin its entire memory with the kernel map.
Alexander Graf wrote:
While enabling gfxboot over vmx is very desirable, I'd like to avoid
guest-specific hacks. IMO the correct fix is to set a
non_vt_friendly
flag when switching from real mode to protected mode, then continue
emulation, re-computing the flag after every instruction.
Andrew Morton wrote:
Very. kvm pins pages that are referenced by the guest;
hm. Why does it do that?
It was deemed best not to allow the guest to write to a page that has
been swapped out and assigned to an unrelated host process.
One way to view the kvm shadow page tables
On Fri, Feb 15, 2008 at 07:37:36PM -0800, Andrew Morton wrote:
The | is obviously deliberate. But no explanation is provided telling us
why we still call the callback if ptep_clear_flush_young() said the page
was recently referenced. People who read your code will want to understand
this.
On Sat, 16 Feb 2008 11:48:27 +0100 Andrea Arcangeli [EMAIL PROTECTED] wrote:
+void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
+struct mm_struct *mm,
+unsigned long start, unsigned long
end,
+
Those below two patches enable KVM to swap the guest physical memory
through Christoph's V7.
There's one last _purely_theoretical_ race condition I figured out and
that I'm wondering how to best fix. The race condition worst case is
that a few guest physical pages could remain pinned by sptes.
On Sat, Feb 16, 2008 at 11:48:27AM +0100, Andrea Arcangeli wrote:
Those below two patches enable KVM to swap the guest physical memory
through Christoph's V7.
There's one last _purely_theoretical_ race condition I figured out and
that I'm wondering how to best fix. The race condition worst
On Feb 16, 2008, at 10:06 AM, Avi Kivity wrote:
Alexander Graf wrote:
While enabling gfxboot over vmx is very desirable, I'd like to avoid
guest-specific hacks. IMO the correct fix is to set a
non_vt_friendly
flag when switching from real mode to protected mode, then continue
Hi all!
Earlier it was suggested that we go ahead with emulating Perf Mon Events in
exposing it to the guest. The serious limitation in this approach is that we
end up exposing only a small number of events to the guest, even though the
host hardware is capable of much more. The only benefit
On Fri, 15 Feb 2008, Andrew Morton wrote:
On Thu, 14 Feb 2008 22:49:01 -0800 Christoph Lameter [EMAIL PROTECTED]
wrote:
The invalidation of address ranges in a mm_struct needs to be
performed when pages are removed or permissions etc change.
hm. Do they? Why? If I'm in the process
On Fri, 15 Feb 2008, Andrew Morton wrote:
+#define mmu_rmap_notifier(function, args...)
\
+ do {\
+ struct mmu_rmap_notifier *__mrn;\
+ struct
On Fri, 15 Feb 2008, Andrew Morton wrote:
@@ -287,7 +288,8 @@ static int page_referenced_one(struct pa
if (vma-vm_flags VM_LOCKED) {
referenced++;
*mapcount = 1; /* break early from loop */
- } else if (ptep_clear_flush_young(vma, address, pte))
+ }
On Fri, 15 Feb 2008, Andrew Morton wrote:
What is the status of getting infiniband to use this facility?
Well we are talking about this it seems.
How important is this feature to KVM?
Andrea can answer this.
To xpmem?
Without this feature we are stuck with page pinning by increasing
Balaji Rao wrote:
Hi all!
Earlier it was suggested that we go ahead with emulating Perf Mon Events in
exposing it to the guest. The serious limitation in this approach is that we
end up exposing only a small number of events to the guest, even though the
host hardware is capable of much
The following patchset, based on earlier work by Anthony and Ingo, adds
paravirt_ops support for KVM guests enabling hypercall based pte updates,
hypercall batching and cr3 caching.
--
-
This SF.net email is sponsored by:
Add basic KVM paravirt support. Avoid vm-exits on IO delays.
Add KVM_GET_PARA_FEATURES ioctl so paravirt features can be reported via
cpuid.
Signed-off-by: Marcelo Tosatti [EMAIL PROTECTED]
Cc: Anthony Liguori [EMAIL PROTECTED]
Index: kvm.paravirt/arch/x86/Kconfig
Hypercall based pte updates are faster than faults, and also allow use
of the lazy MMU mode to batch operations.
Don't report the feature if two dimensional paging is enabled.
Signed-off-by: Marcelo Tosatti [EMAIL PROTECTED]
Cc: Anthony Liguori [EMAIL PROTECTED]
Index:
Batch pte updates and tlb flushes in lazy MMU mode.
Signed-off-by: Marcelo Tosatti [EMAIL PROTECTED]
Cc: Anthony Liguori [EMAIL PROTECTED]
Index: kvm.paravirt/arch/x86/kernel/kvm.c
===
--- kvm.paravirt.orig/arch/x86/kernel/kvm.c
+++
Mark zapped root pagetables as invalid and ignore such pages during lookup.
This is a problem with the cr3-target feature, where a zapped root table fools
the faulting code into creating a read-only mapping. The result is a lockup
if the instruction can't be emulated.
Signed-off-by: Marcelo
Add support for the cr3 cache feature on Intel VMX CPU's. This avoids
vmexits on context switch if the cr3 value is cached in one of the
entries (currently 4 are present).
This is especially important for Xenner, where each guest syscalls
involves a cr3 switch.
Signed-off-by: Marcelo Tosatti
Marcelo Tosatti wrote:
The following patchset, based on earlier work by Anthony and Ingo, adds
paravirt_ops support for KVM guests enabling hypercall based pte updates,
hypercall batching and cr3 caching.
Could you post performance results for each optimization? I'm
particularly curious
On Sat, Feb 16, 2008 at 05:37:00PM -0600, Anthony Liguori wrote:
Marcelo Tosatti wrote:
The following patchset, based on earlier work by Anthony and Ingo, adds
paravirt_ops support for KVM guests enabling hypercall based pte updates,
hypercall batching and cr3 caching.
Could you post
On Sunday 17 February 2008 03:34:43 am Anthony Liguori wrote:
Balaji Rao wrote:
Hi all!
Earlier it was suggested that we go ahead with emulating Perf Mon Events
in exposing it to the guest. The serious limitation in this approach is
that we end up exposing only a small number of events
On Fri, 15 Feb 2008 19:37:19 PST, Andrew Morton wrote:
Which other potential clients have been identified and how important it it
to those?
The powerpc ehea utilizes its own mmu. Not sure about the importance
to the driver. (But will investigate :)
++doug
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