Re: [Xen-devel] L1TF, and future work

2018-09-11 Thread Dario Faggioli
On Tue, 2018-09-11 at 11:14 -0600, Tamas K Lengyel wrote: > On Tue, Sep 11, 2018 at 9:13 AM Dario Faggioli > https://lists.xenproject.org/archives/html/xen-devel/2018-08/msg02164.html > > > > I'm back now, and am working on the series again. In the meanwhile, > > do > > feel free to share any k

Re: [Xen-devel] L1TF, and future work

2018-09-11 Thread Tamas K Lengyel
On Tue, Sep 11, 2018 at 9:13 AM Dario Faggioli wrote: > > On Mon, 2018-09-10 at 15:45 -0600, Tamas K Lengyel wrote: > > On Fri, Aug 24, 2018 at 3:16 AM Dario Faggioli > > wrote: > > > > > > Note that I'll be off for ~2 weeks, effective next Monday, so feel > > > free > > > to comment, reply, etc,

Re: [Xen-devel] L1TF, and future work

2018-09-11 Thread Dario Faggioli
On Mon, 2018-09-10 at 15:45 -0600, Tamas K Lengyel wrote: > On Fri, Aug 24, 2018 at 3:16 AM Dario Faggioli > wrote: > > > > Note that I'll be off for ~2 weeks, effective next Monday, so feel > > free > > to comment, reply, etc, but expect me to reply back only in > > September. > > Hi Dario, > H

Re: [Xen-devel] L1TF, and future work

2018-09-10 Thread Tamas K Lengyel
On Fri, Aug 24, 2018 at 3:16 AM Dario Faggioli wrote: > > On Wed, 2018-08-15 at 14:17 +0100, Andrew Cooper wrote: > > Hello, > > > > Now that the embargo on XSA-273 is up, we can start publicly > > discussing > > the remaining work do, because there is plenty to do. In no > > particular > > order

Re: [Xen-devel] L1TF, and future work

2018-08-27 Thread Jason Andryuk
On Sat, Aug 25, 2018 at 1:21 AM Juergen Gross wrote: > > On 24/08/18 20:43, Jason Andryuk wrote: > > On Wed, Aug 15, 2018 at 10:39 AM Juergen Gross wrote: > >> > >> On 15/08/18 16:10, Jan Beulich wrote: > >> On 15.08.18 at 15:17, wrote: > 2) 32bit PV guests which use writeable pagetable

Re: [Xen-devel] L1TF, and future work

2018-08-24 Thread Juergen Gross
On 24/08/18 20:43, Jason Andryuk wrote: > On Wed, Aug 15, 2018 at 10:39 AM Juergen Gross wrote: >> >> On 15/08/18 16:10, Jan Beulich wrote: >> On 15.08.18 at 15:17, wrote: 2) 32bit PV guests which use writeable pagetable support will automatically get shadowed when the clear the low

Re: [Xen-devel] L1TF, and future work

2018-08-24 Thread Jason Andryuk
On Wed, Aug 15, 2018 at 10:39 AM Juergen Gross wrote: > > On 15/08/18 16:10, Jan Beulich wrote: > On 15.08.18 at 15:17, wrote: > >> 2) 32bit PV guests which use writeable pagetable support will > >> automatically get shadowed when the clear the lower half. > > > > ... of a page table entry.

Re: [Xen-devel] L1TF, and future work

2018-08-24 Thread Dario Faggioli
On Wed, 2018-08-15 at 14:17 +0100, Andrew Cooper wrote: > Hello, > > Now that the embargo on XSA-273 is up, we can start publicly > discussing > the remaining work do, because there is plenty to do. In no > particular > order... > > > [...] > > 5) Core-aware scheduling. At the moment, Xen will

Re: [Xen-devel] L1TF, and future work

2018-08-15 Thread Juergen Gross
On 15/08/18 16:10, Jan Beulich wrote: On 15.08.18 at 15:17, wrote: >> 2) 32bit PV guests which use writeable pagetable support will >> automatically get shadowed when the clear the lower half. > > ... of a page table entry. > >> Ideally, such >> guests should be modified to use hypercalls

Re: [Xen-devel] L1TF, and future work

2018-08-15 Thread Jan Beulich
>>> On 15.08.18 at 15:17, wrote: > 2) 32bit PV guests which use writeable pagetable support will > automatically get shadowed when the clear the lower half. ... of a page table entry. > Ideally, such > guests should be modified to use hypercalls rather than the ptwr > infrastructure (as its mor

Re: [Xen-devel] L1TF, and future work

2018-08-15 Thread Juergen Gross
On 15/08/18 15:21, Andrew Cooper wrote: > On 15/08/18 14:17, Andrew Cooper wrote: >> Hello, > > Apologies.  Getting Dario's correct email address this time. > >> >> Now that the embargo on XSA-273 is up, we can start publicly discussing >> the remaining work do, because there is plenty to do.  In

Re: [Xen-devel] L1TF, and future work

2018-08-15 Thread Andrew Cooper
On 15/08/18 14:17, Andrew Cooper wrote: > Hello, Apologies.  Getting Dario's correct email address this time. > > Now that the embargo on XSA-273 is up, we can start publicly discussing > the remaining work do, because there is plenty to do.  In no particular > order... > > 1) Attempting to shado

[Xen-devel] L1TF, and future work

2018-08-15 Thread Andrew Cooper
Hello, Now that the embargo on XSA-273 is up, we can start publicly discussing the remaining work do, because there is plenty to do.  In no particular order... 1) Attempting to shadow dom0 from boot leads to some assertions very very quickly.   Shadowing dom0 after-the-fact leads to some very wei