Wei Huang
2010-Jul-01 19:17 UTC
[Xen-devel] [PATCH] AMD OSVW (OS Visible Workaround) for Xen
This path enables AMD OSVW (OS Visible Workaround) feature for Xen. New AMD errata will have a OSVW id assigned in the future. OS is supposed to check OSVW status MSR to find out whether CPU has a specific erratum. Legacy errata are also supported in this patch: traditional family/model/stepping approach will be used if OSVW feature isn''t applicable. This patch is adapted from Hans Rosenfeld''s patch submitted to Linux kernel . Signed-off-by: Wei Huang <wei.huang2@amd.com> Signed-off-by: Hans Rosenfeld <hands.rosenfeld@amd.com> Acked-by: Jan Beulich <jbeulich@novell.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Keir Fraser
2010-Jul-02 18:05 UTC
[Xen-devel] Re: [PATCH] AMD OSVW (OS Visible Workaround) for Xen
On 01/07/2010 20:17, "Wei Huang" <wei.huang2@amd.com> wrote:> This path enables AMD OSVW (OS Visible Workaround) feature for Xen. New > AMD errata will have a OSVW id assigned in the future. OS is supposed to > check OSVW status MSR to find out whether CPU has a specific erratum. > Legacy errata are also supported in this patch: traditional > family/model/stepping approach will be used if OSVW feature isn''t > applicable. This patch is adapted from Hans Rosenfeld''s patch submitted > to Linux kernel .Applied to xen-unstable. Is this for 4.0.1 also? It is a big patch and it doesn''t say it actually fixes any issues... -- Keir> Signed-off-by: Wei Huang <wei.huang2@amd.com> > Signed-off-by: Hans Rosenfeld <hands.rosenfeld@amd.com> > Acked-by: Jan Beulich <jbeulich@novell.com> >_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Wei Huang
2010-Jul-02 18:57 UTC
Re: [Xen-devel] Re: [PATCH] AMD OSVW (OS Visible Workaround) for Xen
Thanks very much. I don''t think 4.0.1 needs this patch. -Wei Keir Fraser wrote:> On 01/07/2010 20:17, "Wei Huang" <wei.huang2@amd.com> wrote: > > >> This path enables AMD OSVW (OS Visible Workaround) feature for Xen. New >> AMD errata will have a OSVW id assigned in the future. OS is supposed to >> check OSVW status MSR to find out whether CPU has a specific erratum. >> Legacy errata are also supported in this patch: traditional >> family/model/stepping approach will be used if OSVW feature isn''t >> applicable. This patch is adapted from Hans Rosenfeld''s patch submitted >> to Linux kernel . >> > > Applied to xen-unstable. Is this for 4.0.1 also? It is a big patch and it > doesn''t say it actually fixes any issues... > > -- Keir > > >> Signed-off-by: Wei Huang <wei.huang2@amd.com> >> Signed-off-by: Hans Rosenfeld <hands.rosenfeld@amd.com> >> Acked-by: Jan Beulich <jbeulich@novell.com> >> >> > > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel > >_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Jan Beulich
2010-Jul-05 07:11 UTC
Re: [Xen-devel] Re: [PATCH] AMD OSVW (OS Visible Workaround) for Xen
>>> On 02.07.10 at 20:57, Wei Huang <wei.huang2@amd.com> wrote: > Thanks very much. I don''t think 4.0.1 needs this patch.I was about to reply with the opposite statement - why do you think so?> Keir Fraser wrote: >> On 01/07/2010 20:17, "Wei Huang" <wei.huang2@amd.com> wrote: >> >> >>> This path enables AMD OSVW (OS Visible Workaround) feature for Xen. New >>> AMD errata will have a OSVW id assigned in the future. OS is supposed to >>> check OSVW status MSR to find out whether CPU has a specific erratum. >>> Legacy errata are also supported in this patch: traditional >>> family/model/stepping approach will be used if OSVW feature isn''t >>> applicable. This patch is adapted from Hans Rosenfeld''s patch submitted >>> to Linux kernel . >>> >> >> Applied to xen-unstable. Is this for 4.0.1 also? It is a big patch and it >> doesn''t say it actually fixes any issues...It''s big only because of it moving around amd.h... The issue it fixes is that newer AMD processor families apparently also require the workaround for erratum 383 (previously applied to Fam10 only). Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Huang2, Wei
2010-Jul-05 14:23 UTC
RE: [Xen-devel] Re: [PATCH] AMD OSVW (OS Visible Workaround) for Xen
Hi Jan, My thought was that this patch won''t affect newer families of CPUs (i.e. production parts). I expected this erratum will be fixed on them. But if you disagree, I will ask Keir to apply it to Xen 4.0.1. Thanks, -Wei ________________________________________ From: Jan Beulich [JBeulich@novell.com] Sent: Monday, July 05, 2010 2:11 AM To: Huang2, Wei; Keir Fraser Cc: Rosenfeld, Hans; xen-devel@lists.xensource.com Subject: Re: [Xen-devel] Re: [PATCH] AMD OSVW (OS Visible Workaround) for Xen>>> On 02.07.10 at 20:57, Wei Huang <wei.huang2@amd.com> wrote: > Thanks very much. I don''t think 4.0.1 needs this patch.I was about to reply with the opposite statement - why do you think so?> Keir Fraser wrote: >> On 01/07/2010 20:17, "Wei Huang" <wei.huang2@amd.com> wrote: >> >> >>> This path enables AMD OSVW (OS Visible Workaround) feature for Xen. New >>> AMD errata will have a OSVW id assigned in the future. OS is supposed to >>> check OSVW status MSR to find out whether CPU has a specific erratum. >>> Legacy errata are also supported in this patch: traditional >>> family/model/stepping approach will be used if OSVW feature isn''t >>> applicable. This patch is adapted from Hans Rosenfeld''s patch submitted >>> to Linux kernel . >>> >> >> Applied to xen-unstable. Is this for 4.0.1 also? It is a big patch and it >> doesn''t say it actually fixes any issues...It''s big only because of it moving around amd.h... The issue it fixes is that newer AMD processor families apparently also require the workaround for erratum 383 (previously applied to Fam10 only). Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Jan Beulich
2010-Jul-05 14:54 UTC
RE: [Xen-devel] Re: [PATCH] AMD OSVW (OS Visible Workaround) for Xen
>>> On 05.07.10 at 16:23, "Huang2, Wei" <Wei.Huang2@amd.com> wrote: > My thought was that this patch won''t affect newer families of CPUs (i.e. > production parts). I expected this erratum will be fixed on them. But if youIf you know that''s going to be the case, then I agree.> disagree, I will ask Keir to apply it to Xen 4.0.1.Jan _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel