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Date: Fri, 01 Oct 2021 15:16:41 +0200 From: Thomas Gleixner <tglx@...utronix.de> To: "Chang S. Bae" <chang.seok.bae@...el.com>, bp@...e.de, luto@...nel.org, mingo@...nel.org, x86@...nel.org Cc: len.brown@...el.com, lenb@...nel.org, dave.hansen@...el.com, thiago.macieira@...el.com, jing2.liu@...el.com, ravi.v.shankar@...el.com, linux-kernel@...r.kernel.org, chang.seok.bae@...el.com Subject: Re: [PATCH v10 05/28] x86/fpu/xstate: Add a new variable to indicate dynamic user states On Wed, Aug 25 2021 at 08:53, Chang S. Bae wrote: > +/* > + * This represents user xstates, a subset of xfeatures_mask_all, saved in a > + * dynamic kernel XSAVE buffer. > + */ > +u64 xfeatures_mask_user_dynamic __ro_after_init; > + > static unsigned int xstate_offsets[XFEATURE_MAX] __ro_after_init = > { [ 0 ... XFEATURE_MAX - 1] = -1}; > static unsigned int xstate_sizes[XFEATURE_MAX] __ro_after_init = > @@ -709,6 +715,7 @@ static int __init init_xstate_size(void) > static void fpu__init_disable_system_xstate(void) > { > xfeatures_mask_all = 0; > + xfeatures_mask_user_dynamic = 0; It's zero at boot already, isn't it? > cr4_clear_bits(X86_CR4_OSXSAVE); > setup_clear_cpu_cap(X86_FEATURE_XSAVE); > } > @@ -780,6 +787,8 @@ void __init fpu__init_system_xstate(void) > > /* Store it for paranoia check at the end */ > xfeatures = xfeatures_mask_all; > + /* Do not support the dynamically allocated buffer yet. */ > + xfeatures_mask_user_dynamic = 0; > > /* Enable xstate instructions to be able to continue with initialization: */ > fpu__init_cpu_xstate();
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