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On Tue, Oct 17, 2017 at 04:36:00PM -0400, Boris Ostrovsky wrote: > On 10/17/2017 04:17 PM, Josh Poimboeuf wrote: > > On Tue, Oct 17, 2017 at 11:36:57AM -0400, Boris Ostrovsky wrote: > >> On 10/17/2017 10:36 AM, Josh Poimboeuf wrote: > >>> Maybe we can add a new field to the alternatives entry struct which > >>> specifies the offset to the CALL instruction, so appl...

On Tue, Oct 17, 2017 at 04:36:00PM -0400, Boris Ostrovsky wrote: > On 10/17/2017 04:17 PM, Josh Poimboeuf wrote: > > On Tue, Oct 17, 2017 at 11:36:57AM -0400, Boris Ostrovsky wrote: > >> On 10/17/2017 10:36 AM, Josh Poimboeuf wrote: > >>> Maybe we can add a new field to the alternatives entry struct which > >>> specifies the offset to the CALL instruction, so appl...

On Wed, Oct 25, 2017 at 11:33:43AM +0200, Juergen Gross wrote: > On 04/10/17 17:58, Josh Poimboeuf wrote: > > Some of the paravirt '*_CLOBBERS' macros refer to output constraints > > instead of clobbers, which makes the code extra confusing. Rename the > > output constraint related macros to '*_OUTPUTS'. > > > > Signed-off-by: Josh Poimboeuf <jp...

On Tue, Oct 17, 2017 at 11:36:57AM -0400, Boris Ostrovsky wrote: > On 10/17/2017 10:36 AM, Josh Poimboeuf wrote: > > > > Maybe we can add a new field to the alternatives entry struct which > > specifies the offset to the CALL instruction, so apply_alternatives() > > can find it. > > We'd also have to assume that the restore part of an alternative entry > is the sam...

On Tue, Oct 17, 2017 at 11:36:57AM -0400, Boris Ostrovsky wrote: > On 10/17/2017 10:36 AM, Josh Poimboeuf wrote: > > > > Maybe we can add a new field to the alternatives entry struct which > > specifies the offset to the CALL instruction, so apply_alternatives() > > can find it. > > We'd also have to assume that the restore part of an alternative entry > is the sam...

On Wed, Oct 25, 2017 at 11:33:43AM +0200, Juergen Gross wrote: > On 04/10/17 17:58, Josh Poimboeuf wrote: > > Some of the paravirt '*_CLOBBERS' macros refer to output constraints > > instead of clobbers, which makes the code extra confusing. Rename the > > output constraint related macros to '*_OUTPUTS'. > > > > Signed-off-by: Josh Poimboeuf <jp...

On Wed, Oct 04, 2017 at 10:58:24AM -0500, Josh Poimboeuf wrote: > Convert the hard-coded native patch assembly code strings to macros to > facilitate sharing common code between 32-bit and 64-bit. > > These macros will also be used by a future patch which requires the GCC > extended asm syntax of two '%' characters instead of one...

On Wed, Oct 04, 2017 at 10:58:24AM -0500, Josh Poimboeuf wrote: > Convert the hard-coded native patch assembly code strings to macros to > facilitate sharing common code between 32-bit and 64-bit. > > These macros will also be used by a future patch which requires the GCC > extended asm syntax of two '%' characters instead of one...

...ting rid of .parainstructions, pv ops, and apply_paravirt() completely. (I think Xen can be changed to set CPU feature bits to specify which ops it needs during early boot, then those ops can be patched in using early alternatives.) For more details, see the commit log in patch 11/13. Josh Poimboeuf (13): x86/paravirt: remove wbinvd() paravirt interface x86/paravirt: Fix output constraint macro names x86/paravirt: Convert native patch assembly code strings to macros x86/paravirt: Convert DEF_NATIVE macro to GCC extended asm syntax x86/paravirt: Move paravirt asm macros to paravirt-as...

...ting rid of .parainstructions, pv ops, and apply_paravirt() completely. (I think Xen can be changed to set CPU feature bits to specify which ops it needs during early boot, then those ops can be patched in using early alternatives.) For more details, see the commit log in patch 11/13. Josh Poimboeuf (13): x86/paravirt: remove wbinvd() paravirt interface x86/paravirt: Fix output constraint macro names x86/paravirt: Convert native patch assembly code strings to macros x86/paravirt: Convert DEF_NATIVE macro to GCC extended asm syntax x86/paravirt: Move paravirt asm macros to paravirt-as...

On Wed, Oct 25, 2017 at 01:25:02PM +0200, Juergen Gross wrote: > On 04/10/17 17:58, Josh Poimboeuf wrote: > > Add alternative patching support for replacing an instruction with an > > indirect call. This will be needed for the paravirt alternatives. > > > > Signed-off-by: Josh Poimboeuf <jpoimboe at redhat.com> > > --- > > arch/x86/kernel/alternative....

On Wed, Oct 25, 2017 at 01:25:02PM +0200, Juergen Gross wrote: > On 04/10/17 17:58, Josh Poimboeuf wrote: > > Add alternative patching support for replacing an instruction with an > > indirect call. This will be needed for the paravirt alternatives. > > > > Signed-off-by: Josh Poimboeuf <jpoimboe at redhat.com> > > --- > > arch/x86/kernel/alternative....

On Fri, Nov 17, 2017 at 08:10:13PM +0100, Juergen Gross wrote: > On 17/11/17 19:07, Borislav Petkov wrote: > > On Wed, Oct 04, 2017 at 10:58:24AM -0500, Josh Poimboeuf wrote: > >> Convert the hard-coded native patch assembly code strings to macros to > >> facilitate sharing common code between 32-bit and 64-bit. > >> > >> These macros will also be used by a future patch which requires the GCC > >> extended asm syntax o...

On Fri, Nov 17, 2017 at 08:10:13PM +0100, Juergen Gross wrote: > On 17/11/17 19:07, Borislav Petkov wrote: > > On Wed, Oct 04, 2017 at 10:58:24AM -0500, Josh Poimboeuf wrote: > >> Convert the hard-coded native patch assembly code strings to macros to > >> facilitate sharing common code between 32-bit and 64-bit. > >> > >> These macros will also be used by a future patch which requires the GCC > >> extended asm syntax o...

On 10/17/2017 04:50 PM, Josh Poimboeuf wrote: > On Tue, Oct 17, 2017 at 04:36:00PM -0400, Boris Ostrovsky wrote: >> On 10/17/2017 04:17 PM, Josh Poimboeuf wrote: >>> On Tue, Oct 17, 2017 at 11:36:57AM -0400, Boris Ostrovsky wrote: >>>> On 10/17/2017 10:36 AM, Josh Poimboeuf wrote: >>>>> Maybe...

On 17/11/17 20:42, Josh Poimboeuf wrote: > On Fri, Nov 17, 2017 at 08:10:13PM +0100, Juergen Gross wrote: >> On 17/11/17 19:07, Borislav Petkov wrote: >>> On Wed, Oct 04, 2017 at 10:58:24AM -0500, Josh Poimboeuf wrote: >>>> Convert the hard-coded native patch assembly code strings to macros to >>...

Some of the paravirt '*_CLOBBERS' macros refer to output constraints instead of clobbers, which makes the code extra confusing. Rename the output constraint related macros to '*_OUTPUTS'. Signed-off-by: Josh Poimboeuf <jpoimboe at redhat.com> --- arch/x86/include/asm/paravirt_types.h | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h index 0e112f279514..e99e5ac3e036 100644 --- a/arch/x...

Add alternative patching support for replacing an instruction with an indirect call. This will be needed for the paravirt alternatives. Signed-off-by: Josh Poimboeuf <jpoimboe at redhat.com> --- arch/x86/kernel/alternative.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index 3344d3382e91..81c577c7deba 100644 --- a/arch/x86/kernel/alternative.c +++...

...d native patch assembly code strings to macros to facilitate sharing common code between 32-bit and 64-bit. These macros will also be used by a future patch which requires the GCC extended asm syntax of two '%' characters instead of one when specifying a register name. Signed-off-by: Josh Poimboeuf <jpoimboe at redhat.com> --- arch/x86/include/asm/special_insns.h | 24 ++++++++++++++++++++++++ arch/x86/kernel/paravirt_patch_32.c | 21 +++++++++++---------- arch/x86/kernel/paravirt_patch_64.c | 29 +++++++++++++++-------------- 3 files changed, 50 insertions(+), 24 deletions(-) diff...

On Tue, Oct 17, 2017 at 09:58:59AM -0400, Boris Ostrovsky wrote: > On 10/17/2017 01:24 AM, Josh Poimboeuf wrote: > > On Mon, Oct 16, 2017 at 02:18:48PM -0400, Boris Ostrovsky wrote: > >> On 10/12/2017 03:53 PM, Boris Ostrovsky wrote: > >>> On 10/12/2017 03:27 PM, Andrew Cooper wrote: > >>>> On 12/10/17 20:11, Boris Ostrovsky wrote: > >>>>> The...