On Tue, Jun 30, 2020 at 06:37:16PM +0100, Will Deacon wrote:
> The patches allow architectures to provide their own implementation of
> __READ_ONCE(). This serves two main purposes:
>
> 1. It finally allows us to remove [smp_]read_barrier_depends() from the
> Linux memory model and make it
On Mon, Nov 03, 2014 at 12:10:49PM +, One Thousand Gnomes wrote:
> On Sun, 2 Nov 2014 09:33:01 -0800
> Josh Triplett wrote:
>
> > On the vast majority of modern systems, no processes will use the
> > userspsace IO syscalls, iopl and ioperm. Add a new config option,
>
This makes the two major functions of exit_thread (IO and FPU) more
obvious, and will make it easier to make IO optional later.
Signed-off-by: Josh Triplett
---
arch/x86/kernel/process-io.h | 20
arch/x86/kernel/process.c| 20 +++-
2 files changed, 23
This simplifies __switch_to a bit, and will make it easier to make iopl
optional later.
Signed-off-by: Josh Triplett
---
arch/x86/kernel/process-io.h | 13 +
arch/x86/kernel/process_32.c | 9 +
2 files changed, 14 insertions(+), 8 deletions(-)
diff --git a/arch/x86/kernel
8576 384 -8192
Signed-off-by: Josh Triplett
---
arch/x86/Kconfig | 10 ++
arch/x86/include/asm/paravirt.h | 2 ++
arch/x86/include/asm/paravirt_types.h | 4
arch/x86/include/asm/processor.h | 19 ++-
arch/x86/include/asm
This simplifies __switch_to_xtra, and will make it easier to make IO
optional later.
Signed-off-by: Josh Triplett
---
arch/x86/kernel/process-io.h | 23 +++
arch/x86/kernel/process.c| 14 +-
2 files changed, 24 insertions(+), 13 deletions(-)
diff --git a
This will make it easier to make the io_bitmap_ptr field optional later.
Signed-off-by: Josh Triplett
---
arch/x86/kernel/process-io.h | 5 +
arch/x86/kernel/process_32.c | 4 ++--
arch/x86/kernel/process_64.c | 2 +-
3 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/x86
-related fields optional
later.
Signed-off-by: Josh Triplett
---
arch/x86/include/asm/processor.h | 14 ++
arch/x86/kernel/cpu/common.c | 12 ++--
2 files changed, 16 insertions(+), 10 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
No functional change, just splitting out parts of the existing
INIT_THREAD and INIT_TSS macros. This will simplify making those fields
optional later.
Signed-off-by: Josh Triplett
---
arch/x86/include/asm/processor.h | 18 +++---
1 file changed, 11 insertions(+), 7 deletions
This will allow making set_iopl_mask optional later.
Signed-off-by: Josh Triplett
---
arch/x86/include/asm/paravirt_types.h | 1 +
arch/x86/kernel/paravirt.c| 2 +-
arch/x86/xen/enlighten.c | 4 ++--
3 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch
; move the resulting identical code to a
static inline in a common header.
Signed-off-by: Josh Triplett
Acked-by: Kees Cook
---
arch/x86/kernel/process-io.h | 22 ++
arch/x86/kernel/process_32.c | 28
arch/x86/kernel/process_64.c | 25
That then removes the last use of IO_BITMAP_OFFSET, so delete it.
Signed-off-by: Josh Triplett
Acked-by: Alexander van Heukelum
---
arch/x86/include/asm/desc.h | 11 +--
arch/x86/include/asm/processor.h | 4 +++-
2 files changed, 4 insertions(+), 11 deletions(-)
diff --git a/arch/x
, as requested by Thomas Gleixner.
I've verified that this compiles after each patch.
Josh Triplett (10):
x86: process: Unify 32-bit and 64-bit copy_thread I/O bitmap handling
x86: tss: Eliminate fragile calculation of TSS segment limit
x86: processor.h: Introduce macros to initiali
On Wed, Oct 29, 2014 at 10:00:54PM +0100, Thomas Gleixner wrote:
> On Wed, 29 Oct 2014, Josh Triplett wrote:
> > v3: Eliminated several #ifdefs, and in particular almost all #ifdefs in
> > .c files, by adding a macro INIT_SET_IOPL_MASK to use in place of
> >
257-107
__switch_to_xtra 234 123-111
sys_ioperm 240 --240
init_tss8576 384 -8192
Signed-off-by: Josh Triplett
---
v3: Eliminated several #ifdefs, and in particular almost all
; move the resulting identical code to a
static inline in a common header.
Signed-off-by: Josh Triplett
Acked-by: Kees Cook
---
v3: No changes in this patch, only in patch 3/3.
arch/x86/kernel/process-io.h | 22 ++
arch/x86/kernel/process_32.c | 28
That then removes the last use of IO_BITMAP_OFFSET, so delete it.
Signed-off-by: Josh Triplett
Acked-by: Alexander van Heukelum
---
v3: No changes in this patch, only in patch 3/3.
arch/x86/include/asm/desc.h | 11 +--
arch/x86/include/asm/processor.h | 4 +++-
2 files changed, 4
; move the resulting identical code to a
static inline in a common header.
Signed-off-by: Josh Triplett
Acked-by: Kees Cook
---
v2: Rebased and updated for changes to copy_thread; no other changes in
patch 1/3.
arch/x86/kernel/process-io.h | 22 ++
arch/x86/kernel/process_32
129 --129
copy_thread 598 455-143
sys_ioperm 442 --442
init_tss8896 640 -8256
Signed-off-by: Josh Triplett
---
v2: Rebased. Updated bloat-o-meter
That then removes the last use of IO_BITMAP_OFFSET, so delete it.
Signed-off-by: Josh Triplett
Acked-by: Alexander van Heukelum
---
v2: Rebased. Added a comment explaining the -1 in the calculation.
arch/x86/include/asm/desc.h | 11 +--
arch/x86/include/asm/processor.h | 4 +++
:372:5: warning: no previous prototype for
> ‘virtballoon_migratepage’ [-Wmissing-prototypes]
>
> Signed-off-by: Rashika Kheria
Reviewed-by: Josh Triplett
> drivers/virtio/virtio_balloon.c |2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drive
On Thu, Oct 31, 2013 at 09:04:42PM +0100, Alexander van Heukelum wrote:
> On Tue, Oct 22, 2013, at 3:35, Josh Triplett wrote:
> > --- a/arch/x86/Kconfig
> > +++ b/arch/x86/Kconfig
> > @@ -976,6 +976,16 @@ config VM86
> > XFree86 to initialize some video car
On Thu, Oct 31, 2013 at 09:02:14PM +0100, Alexander van Heukelum wrote:
> Hi Josh,
>
> On Tue, Oct 22, 2013, at 3:34, Josh Triplett wrote:
> > __set_tss_desc has a complex calculation of the TSS segment limit,
> > duplicating the quirky details of the I/O bitmap array length
On Thu, Oct 31, 2013 at 09:01:30PM +0100, Alexander van Heukelum wrote:
> On Tue, Oct 22, 2013, at 3:34, Josh Triplett wrote:
> > The 32-bit and 64-bit versions of copy_thread have functionally
> > identical handling for copying the I/O bitmap, modulo differences in
> > erro
t above, which goes away
now that TSS_LIMIT uses the offset of the *following* field rather than
recalculating the size of the iobitmap.
- Josh Triplett
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On Wed, Oct 30, 2013 at 03:22:33PM -0700, Kees Cook wrote:
> On Mon, Oct 21, 2013 at 7:34 PM, Josh Triplett wrote:
> > __set_tss_desc has a complex calculation of the TSS segment limit,
> > duplicating the quirky details of the I/O bitmap array length, and
> > requiring
SyS_iopl 137 --137
copy_thread 694 520-174
sys_ioperm 473 --473
init_tss8896 640 -8256
Signed-off-by: Josh Triplett
473 --473
init_tss8896 640 -8256
Josh Triplett (3):
x86: process: Unify 32-bit and 64-bit copy_thread I/O bitmap handling
x86: tss: Eliminate fragile calculation of TSS segment limit
x86: Support compiling out userspace I/O
; move the resulting identical code to a
static inline in a common header.
Signed-off-by: Josh Triplett
---
arch/x86/kernel/process-io.h | 22 ++
arch/x86/kernel/process_32.c | 29 -
arch/x86/kernel/process_64.c | 26 +-
3 files
That then removes the last use of IO_BITMAP_OFFSET, so delete it.
Signed-off-by: Josh Triplett
---
arch/x86/include/asm/desc.h | 11 +--
arch/x86/include/asm/processor.h | 3 ++-
2 files changed, 3 insertions(+), 11 deletions(-)
diff --git a/arch/x86/include/asm/desc.h b/arch/x86/i
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