From: Thomas Gleixner Date: Thu, 24 Mar 2022 13:47:11 +0000 (+0100) Subject: x86/fpu/xsave: Initialize offset/size cache early X-Git-Tag: v6.1-rc5~1613^2~4 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=35a77d4503d9d9d0e19e3a2a0d3fc9ab09fb6857;p=platform%2Fkernel%2Flinux-starfive.git x86/fpu/xsave: Initialize offset/size cache early Reading XSTATE feature information from CPUID over and over does not make sense. The information has to be cached anyway, so it can be done early. Prepare for runtime calculation of XSTATE offsets and allow consolidation of the size calculation functions in a later step. Rename the function while at it as it does not setup any features. Signed-off-by: Thomas Gleixner Signed-off-by: Borislav Petkov Link: https://lore.kernel.org/r/20220324134623.519411939@linutronix.de --- diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c index dc33556..814c2fd 100644 --- a/arch/x86/kernel/fpu/xstate.c +++ b/arch/x86/kernel/fpu/xstate.c @@ -180,7 +180,7 @@ static bool xfeature_enabled(enum xfeature xfeature) * Record the offsets and sizes of various xstates contained * in the XSAVE state memory layout. */ -static void __init setup_xstate_features(void) +static void __init setup_xstate_cache(void) { u32 eax, ebx, ecx, edx, i; /* start at the beginning of the "extended state" */ @@ -390,7 +390,6 @@ static void __init setup_init_fpu_buf(void) if (!boot_cpu_has(X86_FEATURE_XSAVE)) return; - setup_xstate_features(); print_xstate_features(); xstate_init_xcomp_bv(&init_fpstate.regs.xsave, fpu_kernel_cfg.max_features); @@ -906,6 +905,10 @@ void __init fpu__init_system_xstate(unsigned int legacy_size) /* Enable xstate instructions to be able to continue with initialization: */ fpu__init_cpu_xstate(); + + /* Cache size, offset and flags for initialization */ + setup_xstate_cache(); + err = init_xstate_size(); if (err) goto out_disable;