diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2025-04-18 09:00:37 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2025-04-24 13:39:34 -0400 |
| commit | 45eb29140e68ffe8e93a5471006858a018480a45 (patch) | |
| tree | 5bf352a82619d2517a9f6eed17917b036e01da11 /arch/arm64/kernel/pi/map_kernel.c | |
| parent | fd02aa45bda6d2f2fedcab70e828867332ef7e1c (diff) | |
| parent | 2d7124941a273c7233849a7a2bbfbeb7e28f1caa (diff) | |
Merge branch 'kvm-fixes-6.15-rc4' into HEAD
* Single fix for broken usage of 'multi-MIDR' infrastructure in PI
code, adding an open-coded erratum check for Cavium ThunderX
* Bugfixes from a planned posted interrupt rework
* Do not use kvm_rip_read() unconditionally to cater for guests
with inaccessible register state.
Diffstat (limited to 'arch/arm64/kernel/pi/map_kernel.c')
| -rw-r--r-- | arch/arm64/kernel/pi/map_kernel.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/arch/arm64/kernel/pi/map_kernel.c b/arch/arm64/kernel/pi/map_kernel.c index e57b043f324b..c6650cfe706c 100644 --- a/arch/arm64/kernel/pi/map_kernel.c +++ b/arch/arm64/kernel/pi/map_kernel.c @@ -207,6 +207,29 @@ static void __init map_fdt(u64 fdt) dsb(ishst); } +/* + * PI version of the Cavium Eratum 27456 detection, which makes it + * impossible to use non-global mappings. + */ +static bool __init ng_mappings_allowed(void) +{ + static const struct midr_range cavium_erratum_27456_cpus[] __initconst = { + /* Cavium ThunderX, T88 pass 1.x - 2.1 */ + MIDR_RANGE(MIDR_THUNDERX, 0, 0, 1, 1), + /* Cavium ThunderX, T81 pass 1.0 */ + MIDR_REV(MIDR_THUNDERX_81XX, 0, 0), + {}, + }; + + for (const struct midr_range *r = cavium_erratum_27456_cpus; r->model; r++) { + if (midr_is_cpu_model_range(read_cpuid_id(), r->model, + r->rv_min, r->rv_max)) + return false; + } + + return true; +} + asmlinkage void __init early_map_kernel(u64 boot_status, void *fdt) { static char const chosen_str[] __initconst = "/chosen"; @@ -246,7 +269,7 @@ asmlinkage void __init early_map_kernel(u64 boot_status, void *fdt) u64 kaslr_seed = kaslr_early_init(fdt, chosen); if (kaslr_seed && kaslr_requires_kpti()) - arm64_use_ng_mappings = true; + arm64_use_ng_mappings = ng_mappings_allowed(); kaslr_offset |= kaslr_seed & ~(MIN_KIMG_ALIGN - 1); } |