On 11/01/2021 19:03, Borislav Petkov wrote:
> On Mon, Jan 11, 2021 at 06:51:59PM +0800, Tony W Wang-oc wrote:
>> This issue will be enhanced by hardware and patch submit will be pending.
>
> I have no clue what that has to do with your current patch... you might
> need to expl
On 07/01/2021 23:52, Dave Hansen wrote:
> On 1/6/21 10:19 PM, Tony W Wang-oc wrote:
>> +/*
>> + * These CPUs declare support SSE4.2 instruction sets but
>> + * having low performance CRC32C instruction implementation.
>> + */
>> +if (c-&
On 07/01/2021 14:37, Borislav Petkov wrote:
> On Thu, Jan 07, 2021 at 02:19:06PM +0800, Tony W Wang-oc wrote:
>> SSE4.2 on Zhaoxin CPUs are compatible with Intel. The presence of
>> CRC32C instruction is enumerated by CPUID.01H:ECX.SSE4_2[bit 20] = 1.
>> Some Zhaoxin CPUs d
On 03/01/2021 05:12, Herbert Xu wrote:
> On Tue, Dec 15, 2020 at 06:28:11PM +0800, Tony W Wang-oc wrote:
>> The driver crc32c-intel match CPUs supporting X86_FEATURE_XMM4_2.
>> On platforms with Zhaoxin CPUs supporting this X86 feature, when
>> crc32c-intel and crc32c-generi
cember 16, 2020 1:56:45 AM GMT+08:00, Eric Biggers
>>>> wrote:
>>>>> On Tue, Dec 15, 2020 at 10:15:29AM +0800, Tony W Wang-oc wrote:
>>>>>>
>>>>>> On 15/12/2020 04:41, Eric Biggers wrote:
>>>>>>> On Mon, Dec 14,
Low performance CRC32C instruction CPUs expect to use the driver
crc32c-generic. So remove these CPUs support from crc32c-intel.
Signed-off-by: Tony W Wang-oc
---
arch/x86/crypto/crc32c-intel_glue.c | 5 +
1 file changed, 5 insertions(+)
diff --git a/arch/x86/crypto/crc32c-intel_glue.c
b
Some Zhaoxin CPUs declare support SSE4.2 instruction sets but
having a CRC32C instruction implementation that not working as
intended. Set low performance CRC32C flag on these CPUs for later
use.
Signed-off-by: Tony W Wang-oc
---
arch/x86/kernel/cpu/centaur.c | 7 +++
arch/x86/kernel/cpu
that the CRC32C instruction is
not working as intended. This low performance CRC32C instruction flag
is depend on X86_FEATURE_XMM4_2.
Signed-off-by: Tony W Wang-oc
---
arch/x86/include/asm/cpufeatures.h | 1 +
arch/x86/kernel/cpu/cpuid-deps.c | 1 +
2 files changed, 2 insertions(+)
diff --git a
indicates low performance CRC32C instruction
implementation, set this flag in Zhaoxin CPUs specific init phase,
and exclude CPUs which setting this flag from the driver crc32c-intel.
https://lkml.org/lkml/2020/12/21/789
Tony W Wang-oc (3):
x86/cpufeatures: Add low performance CRC32C instruction CPU
remove these Zhaoxin CPUs support from
crc32c-intel.
Signed-off-by: Tony W Wang-oc
---
arch/x86/crypto/crc32c-intel_glue.c | 21 +++--
1 file changed, 19 insertions(+), 2 deletions(-)
diff --git a/arch/x86/crypto/crc32c-intel_glue.c
b/arch/x86/crypto/crc32c-intel_glue.c
index
On 15/12/2020 16:58, Peter Zijlstra wrote:
> On Mon, Dec 14, 2020 at 11:59:52AM +0800, Tony W Wang-oc wrote:
>
> Didn't I mention something about a comment?
>
Really sorry for this.
>> static const struct x86_cpu_id crc32c_cpu_id[] = {
>> +X86_MATCH_VE
On 15/12/2020 04:41, Eric Biggers wrote:
> On Mon, Dec 14, 2020 at 10:28:19AM +0800, Tony W Wang-oc wrote:
>> On 12/12/2020 01:43, Eric Biggers wrote:
>>> On Fri, Dec 11, 2020 at 07:29:04PM +0800, Tony W Wang-oc wrote:
>>>> The driver crc32c-intel match CPUs
remove these Zhaoxin CPUs support from
crc32c-intel.
Signed-off-by: Tony W Wang-oc
---
arch/x86/crypto/crc32c-intel_glue.c | 10 +-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/x86/crypto/crc32c-intel_glue.c
b/arch/x86/crypto/crc32c-intel_glue.c
index feccb52
On 12/12/2020 18:54, Ard Biesheuvel wrote:
> On Sat, 12 Dec 2020 at 10:36, Ard Biesheuvel wrote:
>>
>> On Fri, 11 Dec 2020 at 20:07, Eric Biggers wrote:
>>>
>>> On Fri, Dec 11, 2020 at 07:29:04PM +0800, Tony W Wang-oc wrote:
>>>>
On 12/12/2020 01:43, Eric Biggers wrote:
> On Fri, Dec 11, 2020 at 07:29:04PM +0800, Tony W Wang-oc wrote:
>> The driver crc32c-intel match CPUs supporting X86_FEATURE_XMM4_2.
>> On platforms with Zhaoxin CPUs supporting this X86 feature, When
>> crc32c-intel and crc32c-generi
On 11/12/2020 21:00, Peter Zijlstra wrote:
> On Fri, Dec 11, 2020 at 07:29:04PM +0800, Tony W Wang-oc wrote:
>> The driver crc32c-intel match CPUs supporting X86_FEATURE_XMM4_2.
>> On platforms with Zhaoxin CPUs supporting this X86 feature, When
>> crc32c-intel and cr
crc32c-generic driver for
some Zhaoxin CPUs to get performance gain, So remove these Zhaoxin
CPUs support from crc32c-intel.
Signed-off-by: Tony W Wang-oc
---
arch/x86/crypto/crc32c-intel_glue.c | 8
1 file changed, 8 insertions(+)
diff --git a/arch/x86/crypto/crc32c-intel_glue.c
b/arch
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