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...preempted information should be just an hint and not fundamental for correct functionality of the guest pv spinlock code. This bug was introduced in commit 0b9f6c4615c993d2b552e0d2bd1ade49b56e5beb in v4.9-rc7. >From 458897fd44aa9b91459a006caa4051a7d1628a23 Mon Sep 17 00:00:00 2001 From: Andrea Arcangeli <aarcange at redhat.com> Date: Sat, 17 Dec 2016 18:43:52 +0100 Subject: [PATCH 1/2] kvm: fix schedule in atomic in kvm_steal_time_set_preempted() kvm_steal_time_set_preempted() isn't disabling the pagefaults before calling __copy_to_user and the kernel debug notices. Signed-off-by: And...

...preempted information should be just an hint and not fundamental for correct functionality of the guest pv spinlock code. This bug was introduced in commit 0b9f6c4615c993d2b552e0d2bd1ade49b56e5beb in v4.9-rc7. >From 458897fd44aa9b91459a006caa4051a7d1628a23 Mon Sep 17 00:00:00 2001 From: Andrea Arcangeli <aarcange at redhat.com> Date: Sat, 17 Dec 2016 18:43:52 +0100 Subject: [PATCH 1/2] kvm: fix schedule in atomic in kvm_steal_time_set_preempted() kvm_steal_time_set_preempted() isn't disabling the pagefaults before calling __copy_to_user and the kernel debug notices. Signed-off-by: And...

hi, Andrea thanks for your reply. :) ? 2016/12/19 19:42, Andrea Arcangeli ??: > Hello, > > On Wed, Nov 02, 2016 at 05:08:35AM -0400, Pan Xinhui wrote: >> Support the vcpu_is_preempted() functionality under KVM. This will >> enhance lock performance on overcommitted hosts (more runnable vcpus >> than physical cpus in the system) as doing busy wa...

...y bit through setting up kmaps and access them through kernel virtual address, this may result alias in virtually tagged caches that require a dcache flush afterwards. Cc: Christoph Hellwig <hch at infradead.org> Cc: James Bottomley <James.Bottomley at HansenPartnership.com> Cc: Andrea Arcangeli <aarcange at redhat.com> Fixes: 3a4d5c94e9593 ("vhost_net: a kernel-level virtio server") Signed-off-by: Jason Wang <jasowang at redhat.com> --- drivers/vhost/vhost.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 351af...

...y bit through setting up kmaps and access them through kernel virtual address, this may result alias in virtually tagged caches that require a dcache flush afterwards. Cc: Christoph Hellwig <hch at infradead.org> Cc: James Bottomley <James.Bottomley at HansenPartnership.com> Cc: Andrea Arcangeli <aarcange at redhat.com> Fixes: 3a4d5c94e9593 ("vhost_net: a kernel-level virtio server") Signed-off-by: Jason Wang <jasowang at redhat.com> --- drivers/vhost/vhost.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 351af...

...tel.com> > Cc: Michael S. Tsirkin <mst at redhat.com> > Cc: Paolo Bonzini <pbonzini at redhat.com> > Cc: Cornelia Huck <cornelia.huck at de.ibm.com> > Cc: Amit Shah <amit.shah at redhat.com> > Cc: Dave Hansen <dave.hansen at intel.com> > Cc: Andrea Arcangeli <aarcange at redhat.com> > Cc: David Hildenbrand <david at redhat.com> > --- > include/uapi/linux/virtio_balloon.h | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h > in...

...tel.com> > Cc: Michael S. Tsirkin <mst at redhat.com> > Cc: Paolo Bonzini <pbonzini at redhat.com> > Cc: Cornelia Huck <cornelia.huck at de.ibm.com> > Cc: Amit Shah <amit.shah at redhat.com> > Cc: Dave Hansen <dave.hansen at intel.com> > Cc: Andrea Arcangeli <aarcange at redhat.com> > Cc: David Hildenbrand <david at redhat.com> > --- > include/uapi/linux/virtio_balloon.h | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h > in...

...s. This is his response which he asked me to forward to ext3-users since he can't post being a non-subscriber BTW, Redhat should whitelist various kernel hackers email address on their mailserver so that they can post freely to various lists Regards, Yusuf ----- Forwarded message from Andrea Arcangeli <andrea@suse.de> ----- Date: Mon, 26 Nov 2001 15:26:17 +0100 From: Andrea Arcangeli <andrea@suse.de> To: Yusuf Goolamabbas <yusufg@outblaze.com> Cc: ext3-users@redhat.com Subject: Re: VFS bug in 2.4.10+ which applies ulimits to block devices Message-ID: <20011126152617.F14196@...

...plified get_user()/put_user() pair protected by a global mutex is provided as a fallback. The fallback may lead false positive that userspace may see more dirty pages. Cc: Christoph Hellwig <hch at infradead.org> Cc: James Bottomley <James.Bottomley at HansenPartnership.com> Cc: Andrea Arcangeli <aarcange at redhat.com> Cc: Thomas Gleixner <tglx at linutronix.de> Cc: Ingo Molnar <mingo at redhat.com> Cc: Peter Zijlstra <peterz at infradead.org> Cc: Darren Hart <dvhart at infradead.org> Fixes: 3a4d5c94e9593 ("vhost_net: a kernel-level virtio server")...

...plified get_user()/put_user() pair protected by a global mutex is provided as a fallback. The fallback may lead false positive that userspace may see more dirty pages. Cc: Christoph Hellwig <hch at infradead.org> Cc: James Bottomley <James.Bottomley at HansenPartnership.com> Cc: Andrea Arcangeli <aarcange at redhat.com> Cc: Thomas Gleixner <tglx at linutronix.de> Cc: Ingo Molnar <mingo at redhat.com> Cc: Peter Zijlstra <peterz at infradead.org> Cc: Darren Hart <dvhart at infradead.org> Fixes: 3a4d5c94e9593 ("vhost_net: a kernel-level virtio server")...

...redhat.com> > > > Cc: Paolo Bonzini <pbonzini at redhat.com> > > > Cc: Cornelia Huck <cornelia.huck at de.ibm.com> > > > Cc: Amit Shah <amit.shah at redhat.com> > > > Cc: Dave Hansen <dave.hansen at intel.com> > > > Cc: Andrea Arcangeli <aarcange at redhat.com> > > > Cc: David Hildenbrand <david at redhat.com> > > > --- > > > include/uapi/linux/virtio_balloon.h | 12 ++++++++++++ > > > 1 file changed, 12 insertions(+) > > > > > > diff --git a/include/uapi/linux/vir...

...redhat.com> > > > Cc: Paolo Bonzini <pbonzini at redhat.com> > > > Cc: Cornelia Huck <cornelia.huck at de.ibm.com> > > > Cc: Amit Shah <amit.shah at redhat.com> > > > Cc: Dave Hansen <dave.hansen at intel.com> > > > Cc: Andrea Arcangeli <aarcange at redhat.com> > > > Cc: David Hildenbrand <david at redhat.com> > > > --- > > > include/uapi/linux/virtio_balloon.h | 12 ++++++++++++ > > > 1 file changed, 12 insertions(+) > > > > > > diff --git a/include/uapi/linux/vir...

On 2019/3/11 ??9:43, Andrea Arcangeli wrote: > On Mon, Mar 11, 2019 at 08:48:37AM -0400, Michael S. Tsirkin wrote: >> Using copyXuser is better I guess. > It certainly would be faster there, but I don't think it's needed if > that would be the only use case left that justifies supporting two > different models...

On Mon, Mar 11, 2019 at 03:40:31PM +0800, Jason Wang wrote: > > On 2019/3/9 ??3:48, Andrea Arcangeli wrote: > > Hello Jeson, > > > > On Fri, Mar 08, 2019 at 04:50:36PM +0800, Jason Wang wrote: > > > Just to make sure I understand here. For boosting through huge TLB, do > > > you mean we can do that in the future (e.g by mapping more userspace > > > pag...

On Mon, Mar 11, 2019 at 03:40:31PM +0800, Jason Wang wrote: > > On 2019/3/9 ??3:48, Andrea Arcangeli wrote: > > Hello Jeson, > > > > On Fri, Mar 08, 2019 at 04:50:36PM +0800, Jason Wang wrote: > > > Just to make sure I understand here. For boosting through huge TLB, do > > > you mean we can do that in the future (e.g by mapping more userspace > > > pag...

...top or simply disable LOG_ALL features of vhost. - The helper also requires userspace pointer is located at 4-byte boundary, need to check during dirty log setting Cc: Christoph Hellwig <hch at infradead.org> Cc: James Bottomley <James.Bottomley at HansenPartnership.com> Cc: Andrea Arcangeli <aarcange at redhat.com> Cc: Thomas Gleixner <tglx at linutronix.de> Cc: Ingo Molnar <mingo at redhat.com> Cc: Peter Zijlstra <peterz at infradead.org> Cc: Darren Hart <dvhart at infradead.org> Fixes: 3a4d5c94e9593 ("vhost_net: a kernel-level virtio server")...

...top or simply disable LOG_ALL features of vhost. - The helper also requires userspace pointer is located at 4-byte boundary, need to check during dirty log setting Cc: Christoph Hellwig <hch at infradead.org> Cc: James Bottomley <James.Bottomley at HansenPartnership.com> Cc: Andrea Arcangeli <aarcange at redhat.com> Cc: Thomas Gleixner <tglx at linutronix.de> Cc: Ingo Molnar <mingo at redhat.com> Cc: Peter Zijlstra <peterz at infradead.org> Cc: Darren Hart <dvhart at infradead.org> Fixes: 3a4d5c94e9593 ("vhost_net: a kernel-level virtio server")...

...Bonzini <pbonzini at redhat.com> > > > > > Cc: Cornelia Huck <cornelia.huck at de.ibm.com> > > > > > Cc: Amit Shah <amit.shah at redhat.com> > > > > > Cc: Dave Hansen <dave.hansen at intel.com> > > > > > Cc: Andrea Arcangeli <aarcange at redhat.com> > > > > > Cc: David Hildenbrand <david at redhat.com> > > > > > --- > > > > > include/uapi/linux/virtio_balloon.h | 12 ++++++++++++ > > > > > 1 file changed, 12 insertions(+) > > > > >...

...Bonzini <pbonzini at redhat.com> > > > > > Cc: Cornelia Huck <cornelia.huck at de.ibm.com> > > > > > Cc: Amit Shah <amit.shah at redhat.com> > > > > > Cc: Dave Hansen <dave.hansen at intel.com> > > > > > Cc: Andrea Arcangeli <aarcange at redhat.com> > > > > > Cc: David Hildenbrand <david at redhat.com> > > > > > --- > > > > > include/uapi/linux/virtio_balloon.h | 12 ++++++++++++ > > > > > 1 file changed, 12 insertions(+) > > > > >...

Hello Jeson, On Fri, Mar 08, 2019 at 04:50:36PM +0800, Jason Wang wrote: > Just to make sure I understand here. For boosting through huge TLB, do > you mean we can do that in the future (e.g by mapping more userspace > pages to kenrel) or it can be done by this series (only about three 4K > pages were vmapped per virtqueue)? When I answered about the advantages of mmu notifier and