| Message ID | 20240206185459.32465-1-andrea.porta@suse.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | arm64: Add the arm64.no32bit_el0 command line option | expand |
Hi-- On 2/6/24 10:54, Andrea della Porta wrote: > Introducing the field 'el0' to the idreg-override for register > ID_AA64PFR0_EL1. This field is also aliased to the new kernel > command line option 'arm64.no32bit_el0' as a more recognizable > and mnemonic name to disable the execution of 32 bit userspace > applications (i.e. avoid Aarch32 execution state in EL0) from > kernel command line. > > Link: https://lore.kernel.org/r/ZVTleETzfFUchs77@apocalypse > Signed-off-by: Andrea della Porta <andrea.porta@suse.com> > --- > Documentation/admin-guide/kernel-parameters.txt | 3 +++ > arch/arm64/kernel/idreg-override.c | 2 ++ > 2 files changed, 5 insertions(+) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index 65731b060e3f..9f962deeef5a 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -433,6 +433,9 @@ > arm64.nosve [ARM64] Unconditionally disable Scalable Vector > Extension support > > + arm64.no32bit_el0 [ARM64] Unconditionally disable the execution of > + 32 bit applications > + That new entry is not in alphabetical order like it should be. > ataflop= [HW,M68k] > > atarimouse= [HW,MOUSE] Atari Mouse
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 65731b060e3f..9f962deeef5a 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -433,6 +433,9 @@ arm64.nosve [ARM64] Unconditionally disable Scalable Vector Extension support + arm64.no32bit_el0 [ARM64] Unconditionally disable the execution of + 32 bit applications + 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 e30fd9e32ef3..642cda19e42d 100644 --- a/arch/arm64/kernel/idreg-override.c +++ b/arch/arm64/kernel/idreg-override.c @@ -86,6 +86,7 @@ static const struct ftr_set_desc pfr0 __prel64_initconst = { .override = &id_aa64pfr0_override, .fields = { FIELD("sve", ID_AA64PFR0_EL1_SVE_SHIFT, pfr0_sve_filter), + FIELD("el0", ID_AA64PFR0_EL1_EL0_SHIFT, NULL), {} }, }; @@ -197,6 +198,7 @@ static const struct { { "arm64.nomops", "id_aa64isar2.mops=0" }, { "arm64.nomte", "id_aa64pfr1.mte=0" }, { "nokaslr", "arm64_sw.nokaslr=1" }, + { "arm64.no32bit_el0", "id_aa64pfr0.el0=1" }, }; static int __init parse_hexdigit(const char *p, u64 *v)
Introducing the field 'el0' to the idreg-override for register ID_AA64PFR0_EL1. This field is also aliased to the new kernel command line option 'arm64.no32bit_el0' as a more recognizable and mnemonic name to disable the execution of 32 bit userspace applications (i.e. avoid Aarch32 execution state in EL0) from kernel command line. Link: https://lore.kernel.org/r/ZVTleETzfFUchs77@apocalypse Signed-off-by: Andrea della Porta <andrea.porta@suse.com> --- Documentation/admin-guide/kernel-parameters.txt | 3 +++ arch/arm64/kernel/idreg-override.c | 2 ++ 2 files changed, 5 insertions(+)