Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On Sat, May 05, 2018 at 11:47:53AM +0200, Jörg Otte wrote: > Patch doesn't hurt me. For me it´s ok. > > Thanks, Jörg Good, thanks for testing! -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On Sat, May 05, 2018 at 11:47:53AM +0200, Jörg Otte wrote: > Patch doesn't hurt me. For me it´s ok. > > Thanks, Jörg Good, thanks for testing! -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

2018-05-04 18:18 GMT+02:00 Borislav Petkov : > On Wed, May 02, 2018 at 02:20:52PM +0200, Thomas Gleixner wrote: >> Thanks for confirming. Still need to find a way which is less fragile, but >> that's probably too much of churn for rc4 >> >> At least I know exactly what's

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

2018-05-04 18:18 GMT+02:00 Borislav Petkov : > On Wed, May 02, 2018 at 02:20:52PM +0200, Thomas Gleixner wrote: >> Thanks for confirming. Still need to find a way which is less fragile, but >> that's probably too much of churn for rc4 >> >> At least I know exactly what's happening, so I can

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On Wed, May 02, 2018 at 02:20:52PM +0200, Thomas Gleixner wrote: > Thanks for confirming. Still need to find a way which is less fragile, but > that's probably too much of churn for rc4 > > At least I know exactly what's happening, so I can write a better changelog. > > Thanks for testing!

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On Wed, May 02, 2018 at 02:20:52PM +0200, Thomas Gleixner wrote: > Thanks for confirming. Still need to find a way which is less fragile, but > that's probably too much of churn for rc4 > > At least I know exactly what's happening, so I can write a better changelog. > > Thanks for testing!

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On Wed, 2 May 2018, Jörg Otte wrote: > 2018-05-02 11:02 GMT+02:00 Thomas Gleixner : > > Ok, I think I know what's going wrong in that steaming pile of horrors of > > CPUID detection. I need to analyze it down to the roots, but if you have > > cycles, can you please test the

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On Wed, 2 May 2018, Jörg Otte wrote: > 2018-05-02 11:02 GMT+02:00 Thomas Gleixner : > > Ok, I think I know what's going wrong in that steaming pile of horrors of > > CPUID detection. I need to analyze it down to the roots, but if you have > > cycles, can you please test the patch below? > > > >

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

2018-05-02 11:02 GMT+02:00 Thomas Gleixner : > On Wed, 2 May 2018, Jörg Otte wrote: >> With revert: >> >> jojo@fichte:~$ dmesg | grep -i -e spec -e micro -e "Linux version" >> >> [0.00] microcode: microcode updated early to revision 0x24, >> date = 2018-01-21 >> [

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

2018-05-02 11:02 GMT+02:00 Thomas Gleixner : > On Wed, 2 May 2018, Jörg Otte wrote: >> With revert: >> >> jojo@fichte:~$ dmesg | grep -i -e spec -e micro -e "Linux version" >> >> [0.00] microcode: microcode updated early to revision 0x24, >> date = 2018-01-21 >> [0.00] Linux

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On Wed, 2 May 2018, Jörg Otte wrote: > With revert: > > jojo@fichte:~$ dmesg | grep -i -e spec -e micro -e "Linux version" > > [0.00] microcode: microcode updated early to revision 0x24, > date = 2018-01-21 > [0.00] Linux version 4.17.0-rc3-revert-1-gcb1069f > (jojo@fichte)

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On Wed, 2 May 2018, Jörg Otte wrote: > With revert: > > jojo@fichte:~$ dmesg | grep -i -e spec -e micro -e "Linux version" > > [0.00] microcode: microcode updated early to revision 0x24, > date = 2018-01-21 > [0.00] Linux version 4.17.0-rc3-revert-1-gcb1069f > (jojo@fichte)

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

2018-05-01 22:14 GMT+02:00 Linus Torvalds : > On Tue, May 1, 2018 at 5:59 AM Thomas Gleixner wrote: > >> Then I really have no idea how reverting the patch you pointed out would >> fix it. > > So I do think that the original patch is buggy. > >

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

2018-05-01 22:14 GMT+02:00 Linus Torvalds : > On Tue, May 1, 2018 at 5:59 AM Thomas Gleixner wrote: > >> Then I really have no idea how reverting the patch you pointed out would >> fix it. > > So I do think that the original patch is buggy. > > What I think *may* be going on is: > > - first we

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On 05/01/2018 11:27 AM, Thomas Gleixner wrote: > On Tue, 1 May 2018, Thomas Gleixner wrote: >> On Tue, 1 May 2018, Jörg Otte wrote: >>> 2018-04-30 21:53 GMT+02:00 Thomas Gleixner : --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -848,6

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On 05/01/2018 11:27 AM, Thomas Gleixner wrote: > On Tue, 1 May 2018, Thomas Gleixner wrote: >> On Tue, 1 May 2018, Jörg Otte wrote: >>> 2018-04-30 21:53 GMT+02:00 Thomas Gleixner : --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -848,6 +848,11 @@ void

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On Tue, May 1, 2018 at 5:59 AM Thomas Gleixner wrote: > Then I really have no idea how reverting the patch you pointed out would > fix it. So I do think that the original patch is buggy. What I think *may* be going on is: - first we do that

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On Tue, May 1, 2018 at 5:59 AM Thomas Gleixner wrote: > Then I really have no idea how reverting the patch you pointed out would > fix it. So I do think that the original patch is buggy. What I think *may* be going on is: - first we do that get_cpu_cap(c);

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On Tue, 1 May 2018, Thomas Gleixner wrote: > On Tue, 1 May 2018, Jörg Otte wrote: > > 2018-04-30 21:53 GMT+02:00 Thomas Gleixner : > > > --- a/arch/x86/kernel/cpu/common.c > > > +++ b/arch/x86/kernel/cpu/common.c > > > @@ -848,6 +848,11 @@ void get_cpu_cap(struct cpuinfo_x86

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On Tue, 1 May 2018, Thomas Gleixner wrote: > On Tue, 1 May 2018, Jörg Otte wrote: > > 2018-04-30 21:53 GMT+02:00 Thomas Gleixner : > > > --- a/arch/x86/kernel/cpu/common.c > > > +++ b/arch/x86/kernel/cpu/common.c > > > @@ -848,6 +848,11 @@ void get_cpu_cap(struct cpuinfo_x86 *c) > > >

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On Tue, 1 May 2018, Jörg Otte wrote: > 2018-04-30 21:53 GMT+02:00 Thomas Gleixner : > > --- a/arch/x86/kernel/cpu/common.c > > +++ b/arch/x86/kernel/cpu/common.c > > @@ -848,6 +848,11 @@ void get_cpu_cap(struct cpuinfo_x86 *c) > > c->x86_power = edx; > >

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

On Tue, 1 May 2018, Jörg Otte wrote: > 2018-04-30 21:53 GMT+02:00 Thomas Gleixner : > > --- a/arch/x86/kernel/cpu/common.c > > +++ b/arch/x86/kernel/cpu/common.c > > @@ -848,6 +848,11 @@ void get_cpu_cap(struct cpuinfo_x86 *c) > > c->x86_power = edx; > > } > > > > +

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

2018-04-30 21:53 GMT+02:00 Thomas Gleixner : > Jörg, > > On Mon, 30 Apr 2018, Jörg Otte wrote: > >> In v4.16 I already had support for BPB, IBRS_FW for spectre_v2 mitigation. >> But this went away in v17-rcx. >> >> With 4.16 I have: >> jojo@fichte:~$ cd

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

2018-04-30 21:53 GMT+02:00 Thomas Gleixner : > Jörg, > > On Mon, 30 Apr 2018, Jörg Otte wrote: > >> In v4.16 I already had support for BPB, IBRS_FW for spectre_v2 mitigation. >> But this went away in v17-rcx. >> >> With 4.16 I have: >> jojo@fichte:~$ cd /sys/devices/system/cpu/vulnerabilities;

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

Jörg, On Mon, 30 Apr 2018, Jörg Otte wrote: > In v4.16 I already had support for BPB, IBRS_FW for spectre_v2 mitigation. > But this went away in v17-rcx. > > With 4.16 I have: > jojo@fichte:~$ cd /sys/devices/system/cpu/vulnerabilities; grep ".*" * > meltdown:Mitigation: PTI >

Re: [v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

Jörg, On Mon, 30 Apr 2018, Jörg Otte wrote: > In v4.16 I already had support for BPB, IBRS_FW for spectre_v2 mitigation. > But this went away in v17-rcx. > > With 4.16 I have: > jojo@fichte:~$ cd /sys/devices/system/cpu/vulnerabilities; grep ".*" * > meltdown:Mitigation: PTI >

[v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

Hi, In v4.16 I already had support for BPB, IBRS_FW for spectre_v2 mitigation. But this went away in v17-rcx. With 4.16 I have: jojo@fichte:~$ cd /sys/devices/system/cpu/vulnerabilities; grep ".*" * meltdown:Mitigation: PTI spectre_v1:Mitigation: __user pointer sanitization

[v4.17-rcx] Lost IBPB, IBRS_FW support for spectre_v2 mitigation.

Hi, In v4.16 I already had support for BPB, IBRS_FW for spectre_v2 mitigation. But this went away in v17-rcx. With 4.16 I have: jojo@fichte:~$ cd /sys/devices/system/cpu/vulnerabilities; grep ".*" * meltdown:Mitigation: PTI spectre_v1:Mitigation: __user pointer sanitization