On Sun, Jan 21, 2018 at 09:49:05AM +0000, David Woodhouse wrote:
> When they advertise the IA32_ARCH_CAPABILITIES MSR and it has the RDCL_NO
> bit set, they don't need KPTI either.
>
> Signed-off-by: David Woodhouse <[email protected]>
> ---
> arch/x86/kernel/cpu/common.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
> index e5d66e9..80572ae 100644
> --- a/arch/x86/kernel/cpu/common.c
> +++ b/arch/x86/kernel/cpu/common.c
> @@ -900,8 +900,13 @@ static void __init early_identify_cpu(struct cpuinfo_x86
> *c)
>
> setup_force_cpu_cap(X86_FEATURE_ALWAYS);
>
> - if (c->x86_vendor != X86_VENDOR_AMD)
> - setup_force_cpu_bug(X86_BUG_CPU_MELTDOWN);
> + if (c->x86_vendor != X86_VENDOR_AMD) {
> + unsigned long ia32_cap = 0;
WARNING: Missing a blank line after declarations
#36: FILE: arch/x86/kernel/cpu/common.c:905:
+ unsigned long ia32_cap = 0;
+ if (cpu_has(c, X86_FEATURE_ARCH_CAPABILITIES))
Yap, that thing seldom is right but this time it makes some sense.
Also,
unsigned long long ia32_cap = 0;
for 32-bit.
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
