| Message ID | 20230216160012.272345-11-kristina.martsenko@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64: support Armv8.8 memcpy instructions in userspace | expand |
On Thu, Feb 16, 2023 at 04:00:12PM +0000, Kristina Martsenko wrote: > Make it possible to disable the MOPS extension at runtime using the > kernel command line. This can be useful for testing or working around > hardware issues. > > Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com> Yeah, I think that's useful if we want to test new cortext strings routines for example. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 6cfa6e3996cf..ee86fe17352d 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -408,6 +408,9 @@ arm64.nosme [ARM64] Unconditionally disable Scalable Matrix Extension support + arm64.nomops [ARM64] Unconditionally disable Memory Copy and Memory + Set instructions support + ataflop= [HW,M68k] atarimouse= [HW,MOUSE] Atari Mouse diff --git a/arch/arm64/kernel/idreg-override.c b/arch/arm64/kernel/idreg-override.c index d833d78a7f31..d13ae90042cb 100644 --- a/arch/arm64/kernel/idreg-override.c +++ b/arch/arm64/kernel/idreg-override.c @@ -123,6 +123,7 @@ static const struct ftr_set_desc isar2 __initconst = { .fields = { FIELD("gpa3", ID_AA64ISAR2_EL1_GPA3_SHIFT, NULL), FIELD("apa3", ID_AA64ISAR2_EL1_APA3_SHIFT, NULL), + FIELD("mops", ID_AA64ISAR2_EL1_MOPS_SHIFT, NULL), {} }, }; @@ -174,6 +175,7 @@ static const struct { "id_aa64isar1.gpi=0 id_aa64isar1.gpa=0 " "id_aa64isar1.api=0 id_aa64isar1.apa=0 " "id_aa64isar2.gpa3=0 id_aa64isar2.apa3=0" }, + { "arm64.nomops", "id_aa64isar2.mops=0" }, { "arm64.nomte", "id_aa64pfr1.mte=0" }, { "nokaslr", "kaslr.disabled=1" }, };
Make it possible to disable the MOPS extension at runtime using the kernel command line. This can be useful for testing or working around hardware issues. Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com> --- Documentation/admin-guide/kernel-parameters.txt | 3 +++ arch/arm64/kernel/idreg-override.c | 2 ++ 2 files changed, 5 insertions(+)