search for: arcang

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2016 Dec 19
2
[PATCH v7 08/11] x86, kvm/x86.c: support vcpu preempted check
...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:...
2016 Dec 19
2
[PATCH v7 08/11] x86, kvm/x86.c: support vcpu preempted check
...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:...
2016 Dec 19
0
[PATCH v7 08/11] x86, kvm/x86.c: support vcpu preempted check
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...
2019 Apr 09
2
[PATCH net] vhost: flush dcache page when logging dirty pages
...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 35...
2019 Apr 09
2
[PATCH net] vhost: flush dcache page when logging dirty pages
...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 35...
2017 Jan 12
2
[PATCH v6 kernel 2/5] virtio-balloon: define new feature bit and head struct
...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 >...
2017 Jan 12
2
[PATCH v6 kernel 2/5] virtio-balloon: define new feature bit and head struct
...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 >...
2001 Nov 26
0
[andrea@suse.de: Re: VFS bug in 2.4.10+ which applies ulimits to block devices]
...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.F141...
2019 May 13
5
[PATCH net] vhost: don't use kmap() to log dirty pages
...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&quot...
2019 May 13
5
[PATCH net] vhost: don't use kmap() to log dirty pages
...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&quot...
2017 Jan 17
2
[virtio-dev] Re: [PATCH v6 kernel 2/5] virtio-balloon: define new feature bit and head struct
...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/...
2017 Jan 17
2
[virtio-dev] Re: [PATCH v6 kernel 2/5] virtio-balloon: define new feature bit and head struct
...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/...
2019 Mar 12
1
[RFC PATCH V2 5/5] vhost: access vq metadata through kernel virtual address
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 mod...
2019 Mar 11
4
[RFC PATCH V2 5/5] vhost: access vq metadata through kernel virtual address
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 > > >...
2019 Mar 11
4
[RFC PATCH V2 5/5] vhost: access vq metadata through kernel virtual address
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 > > >...
2019 May 09
2
[RFC PATCH V2] vhost: don't use kmap() to log dirty pages
...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&quot...
2019 May 09
2
[RFC PATCH V2] vhost: don't use kmap() to log dirty pages
...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&quot...
2017 Jan 18
1
[virtio-dev] Re: [PATCH v6 kernel 2/5] virtio-balloon: define new feature bit and head struct
....oasis-open.org; qemu- > > devel at nongnu.org; linux-mm at kvack.org; linux-kernel at vger.kernel.org; > > virtualization at lists.linux-foundation.org; amit.shah at redhat.com; Hansen, > > Dave; cornelia.huck at de.ibm.com; pbonzini at redhat.com; > > david at redhat.com; aarcange at redhat.com; dgilbert at redhat.com; > > quintela at redhat.com > > Subject: Re: [virtio-dev] Re: [PATCH v6 kernel 2/5] virtio-balloon: define new > > feature bit and head struct > > > > On Fri, Jan 13, 2017 at 09:24:22AM +0000, Li, Liang Z wrote: > > > &g...
2017 Jan 18
1
[virtio-dev] Re: [PATCH v6 kernel 2/5] virtio-balloon: define new feature bit and head struct
....oasis-open.org; qemu- > > devel at nongnu.org; linux-mm at kvack.org; linux-kernel at vger.kernel.org; > > virtualization at lists.linux-foundation.org; amit.shah at redhat.com; Hansen, > > Dave; cornelia.huck at de.ibm.com; pbonzini at redhat.com; > > david at redhat.com; aarcange at redhat.com; dgilbert at redhat.com; > > quintela at redhat.com > > Subject: Re: [virtio-dev] Re: [PATCH v6 kernel 2/5] virtio-balloon: define new > > feature bit and head struct > > > > On Fri, Jan 13, 2017 at 09:24:22AM +0000, Li, Liang Z wrote: > > > &g...
2019 Mar 08
3
[RFC PATCH V2 5/5] vhost: access vq metadata through kernel virtual address
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