Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932627AbbLNTOk (ORCPT ); Mon, 14 Dec 2015 14:14:40 -0500 Received: from mga09.intel.com ([134.134.136.24]:36817 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932348AbbLNTGE (ORCPT ); Mon, 14 Dec 2015 14:06:04 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,428,1444719600"; d="scan'208";a="13016164" Subject: [PATCH 06/32] x86, pkeys: add PKRU xsave fields and data structure(s) To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, x86@kernel.org, Dave Hansen , dave.hansen@linux.intel.com From: Dave Hansen Date: Mon, 14 Dec 2015 11:05:52 -0800 References: <20151214190542.39C4886D@viggo.jf.intel.com> In-Reply-To: <20151214190542.39C4886D@viggo.jf.intel.com> Message-Id: <20151214190552.AB39C958@viggo.jf.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4394 Lines: 120 From: Dave Hansen The protection keys register (PKRU) is saved and restored using xsave. Define the data structure that we will use to access it inside the xsave buffer. Note that we also have to widen the printk of the xsave feature masks since this is feature 0x200 and we only did two characters before. Signed-off-by: Dave Hansen Reviewed-by: Thomas Gleixner --- b/arch/x86/include/asm/fpu/types.h | 11 +++++++++++ b/arch/x86/include/asm/fpu/xstate.h | 4 +++- b/arch/x86/kernel/fpu/xstate.c | 7 ++++++- 3 files changed, 20 insertions(+), 2 deletions(-) diff -puN arch/x86/include/asm/fpu/types.h~pkeys-03-xsave arch/x86/include/asm/fpu/types.h --- a/arch/x86/include/asm/fpu/types.h~pkeys-03-xsave 2015-12-14 10:42:41.383739413 -0800 +++ b/arch/x86/include/asm/fpu/types.h 2015-12-14 10:42:41.390739727 -0800 @@ -109,6 +109,7 @@ enum xfeature { XFEATURE_ZMM_Hi256, XFEATURE_Hi16_ZMM, XFEATURE_PT_UNIMPLEMENTED_SO_FAR, + XFEATURE_PKRU, XFEATURE_MAX, }; @@ -121,6 +122,7 @@ enum xfeature { #define XFEATURE_MASK_OPMASK (1 << XFEATURE_OPMASK) #define XFEATURE_MASK_ZMM_Hi256 (1 << XFEATURE_ZMM_Hi256) #define XFEATURE_MASK_Hi16_ZMM (1 << XFEATURE_Hi16_ZMM) +#define XFEATURE_MASK_PKRU (1 << XFEATURE_PKRU) #define XFEATURE_MASK_FPSSE (XFEATURE_MASK_FP | XFEATURE_MASK_SSE) #define XFEATURE_MASK_AVX512 (XFEATURE_MASK_OPMASK \ @@ -213,6 +215,15 @@ struct avx_512_hi16_state { struct reg_512_bit hi16_zmm[16]; } __packed; +/* + * State component 9: 32-bit PKRU register. The state is + * 8 bytes long but only 4 bytes is used currently. + */ +struct pkru_state { + u32 pkru; + u32 pad; +} __packed; + struct xstate_header { u64 xfeatures; u64 xcomp_bv; diff -puN arch/x86/include/asm/fpu/xstate.h~pkeys-03-xsave arch/x86/include/asm/fpu/xstate.h --- a/arch/x86/include/asm/fpu/xstate.h~pkeys-03-xsave 2015-12-14 10:42:41.385739503 -0800 +++ b/arch/x86/include/asm/fpu/xstate.h 2015-12-14 10:42:41.390739727 -0800 @@ -27,7 +27,9 @@ XFEATURE_MASK_Hi16_ZMM) /* Supported features which require eager state saving */ -#define XFEATURE_MASK_EAGER (XFEATURE_MASK_BNDREGS | XFEATURE_MASK_BNDCSR) +#define XFEATURE_MASK_EAGER (XFEATURE_MASK_BNDREGS | \ + XFEATURE_MASK_BNDCSR | \ + XFEATURE_MASK_PKRU) /* All currently supported features */ #define XCNTXT_MASK (XFEATURE_MASK_LAZY | XFEATURE_MASK_EAGER) diff -puN arch/x86/kernel/fpu/xstate.c~pkeys-03-xsave arch/x86/kernel/fpu/xstate.c --- a/arch/x86/kernel/fpu/xstate.c~pkeys-03-xsave 2015-12-14 10:42:41.387739592 -0800 +++ b/arch/x86/kernel/fpu/xstate.c 2015-12-14 10:42:41.391739771 -0800 @@ -29,6 +29,8 @@ static const char *xfeature_names[] = "AVX-512 Hi256" , "AVX-512 ZMM_Hi256" , "Processor Trace (unused)" , + "Protection Keys User registers", + "unknown xstate feature" , }; /* @@ -57,6 +59,7 @@ void fpu__xstate_clear_all_cpu_caps(void setup_clear_cpu_cap(X86_FEATURE_AVX512ER); setup_clear_cpu_cap(X86_FEATURE_AVX512CD); setup_clear_cpu_cap(X86_FEATURE_MPX); + setup_clear_cpu_cap(X86_FEATURE_PKU); } /* @@ -235,7 +238,7 @@ static void __init print_xstate_feature( const char *feature_name; if (cpu_has_xfeatures(xstate_mask, &feature_name)) - pr_info("x86/fpu: Supporting XSAVE feature 0x%02Lx: '%s'\n", xstate_mask, feature_name); + pr_info("x86/fpu: Supporting XSAVE feature 0x%03Lx: '%s'\n", xstate_mask, feature_name); } /* @@ -251,6 +254,7 @@ static void __init print_xstate_features print_xstate_feature(XFEATURE_MASK_OPMASK); print_xstate_feature(XFEATURE_MASK_ZMM_Hi256); print_xstate_feature(XFEATURE_MASK_Hi16_ZMM); + print_xstate_feature(XFEATURE_MASK_PKRU); } /* @@ -467,6 +471,7 @@ static void check_xstate_against_struct( XCHECK_SZ(sz, nr, XFEATURE_OPMASK, struct avx_512_opmask_state); XCHECK_SZ(sz, nr, XFEATURE_ZMM_Hi256, struct avx_512_zmm_uppers_state); XCHECK_SZ(sz, nr, XFEATURE_Hi16_ZMM, struct avx_512_hi16_state); + XCHECK_SZ(sz, nr, XFEATURE_PKRU, struct pkru_state); /* * Make *SURE* to add any feature numbers in below if _ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/