Re: [Qemu-devel] [qemu-web PATCH] Add a blog post documenting Spectre/Meltdown options for QEMU 2.11.1

2018-02-21 Thread Paolo Bonzini
On 16/02/2018 12:57, Dr. David Alan Gilbert wrote: > It's a bit weird to end up pointing to them to a lkml post; > Paolo: Any ideas on anything better to say? IBRS is really that much slower than retpolines on pre-Skylake machines, so it's a hard call to tell people to use it. It looks like

Re: [Qemu-devel] [qemu-web PATCH] Add a blog post documenting Spectre/Meltdown options for QEMU 2.11.1

2018-02-16 Thread Dr. David Alan Gilbert
* Michael Roth (mdr...@linux.vnet.ibm.com) wrote: > Quoting Dr. David Alan Gilbert (2018-02-14 10:50:40) > > * Michael Roth (mdr...@linux.vnet.ibm.com) wrote: > > > This blog entry is intended as a follow-up to the original entry in > > > January regarding Spectre/Meltdown and the proposed changes

Re: [Qemu-devel] [qemu-web PATCH] Add a blog post documenting Spectre/Meltdown options for QEMU 2.11.1

2018-02-14 Thread Michael Roth
Quoting Dr. David Alan Gilbert (2018-02-14 10:50:40) > * Michael Roth (mdr...@linux.vnet.ibm.com) wrote: > > This blog entry is intended as a follow-up to the original entry in > > January regarding Spectre/Meltdown and the proposed changes to address > > them in the upcoming 2.11.1 release. > >

Re: [Qemu-devel] [qemu-web PATCH] Add a blog post documenting Spectre/Meltdown options for QEMU 2.11.1

2018-02-14 Thread Dr. David Alan Gilbert
* Michael Roth (mdr...@linux.vnet.ibm.com) wrote: > This blog entry is intended as a follow-up to the original entry in > January regarding Spectre/Meltdown and the proposed changes to address > them in the upcoming 2.11.1 release. > > This entry is meant to accompany the 2.11.1 release (planned

Re: [Qemu-devel] [qemu-web PATCH] Add a blog post documenting Spectre/Meltdown options for QEMU 2.11.1

2018-02-14 Thread Michael Roth
Quoting Paolo Bonzini (2018-02-14 04:33:29) > On 14/02/2018 09:51, Daniel P. Berrangé wrote: > >> +Please note that, as mentioned in the previous blog post, QEMU/KVM > >> generally > >> +has the same requirements as other unpriviledged processes running on the > >> +host WRT Spectre/Meltdown

Re: [Qemu-devel] [qemu-web PATCH] Add a blog post documenting Spectre/Meltdown options for QEMU 2.11.1

2018-02-14 Thread Paolo Bonzini
On 14/02/2018 09:51, Daniel P. Berrangé wrote: >> +Please note that, as mentioned in the previous blog post, QEMU/KVM generally >> +has the same requirements as other unpriviledged processes running on the >> +host WRT Spectre/Meltdown mitigation. > > Is this actually still considered accurate wrt

Re: [Qemu-devel] [qemu-web PATCH] Add a blog post documenting Spectre/Meltdown options for QEMU 2.11.1

2018-02-14 Thread David Hildenbrand
On 14.02.2018 10:18, Christian Borntraeger wrote: > > > On 02/14/2018 10:11 AM, Cornelia Huck wrote: >> On Tue, 13 Feb 2018 18:11:05 -0600 >> Michael Roth wrote: >> >>> This blog entry is intended as a follow-up to the original entry in >>> January regarding

Re: [Qemu-devel] [qemu-web PATCH] Add a blog post documenting Spectre/Meltdown options for QEMU 2.11.1

2018-02-14 Thread Cornelia Huck
On Wed, 14 Feb 2018 10:05:24 +0100 Thomas Huth wrote: > On 14.02.2018 01:11, Michael Roth wrote: > > +## enabling mitigations for s390 KVM guests > > + > > +For s390 guests there are 2 CPU options relating to Spectre/Meltdown: > > + > > +* bpb: Branch prediction blocking > >

Re: [Qemu-devel] [qemu-web PATCH] Add a blog post documenting Spectre/Meltdown options for QEMU 2.11.1

2018-02-14 Thread Christian Borntraeger
On 02/14/2018 10:11 AM, Cornelia Huck wrote: > On Tue, 13 Feb 2018 18:11:05 -0600 > Michael Roth wrote: > >> This blog entry is intended as a follow-up to the original entry in >> January regarding Spectre/Meltdown and the proposed changes to address >> them in the

Re: [Qemu-devel] [qemu-web PATCH] Add a blog post documenting Spectre/Meltdown options for QEMU 2.11.1

2018-02-14 Thread Cornelia Huck
On Tue, 13 Feb 2018 18:11:05 -0600 Michael Roth wrote: > This blog entry is intended as a follow-up to the original entry in > January regarding Spectre/Meltdown and the proposed changes to address > them in the upcoming 2.11.1 release. > > This entry is meant to

Re: [Qemu-devel] [qemu-web PATCH] Add a blog post documenting Spectre/Meltdown options for QEMU 2.11.1

2018-02-14 Thread Thomas Huth
On 14.02.2018 01:11, Michael Roth wrote: > This blog entry is intended as a follow-up to the original entry in > January regarding Spectre/Meltdown and the proposed changes to address > them in the upcoming 2.11.1 release. > > This entry is meant to accompany the 2.11.1 release (planned for >

Re: [Qemu-devel] [qemu-web PATCH] Add a blog post documenting Spectre/Meltdown options for QEMU 2.11.1

2018-02-14 Thread Daniel P . Berrangé
On Tue, Feb 13, 2018 at 06:11:05PM -0600, Michael Roth wrote: > This blog entry is intended as a follow-up to the original entry in > January regarding Spectre/Meltdown and the proposed changes to address > them in the upcoming 2.11.1 release. > > This entry is meant to accompany the 2.11.1

Re: [Qemu-devel] [qemu-web PATCH] Add a blog post documenting Spectre/Meltdown options for QEMU 2.11.1

2018-02-13 Thread Bruce Rogers
On 2/13/2018 at 5:11 PM, Michael Roth wrote: > This blog entry is intended as a follow‑up to the original entry in > January regarding Spectre/Meltdown and the proposed changes to address > them in the upcoming 2.11.1 release. > > This entry is meant to accompany the