From patchwork Tue Dec 20 06:36:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Li, Xin3" X-Patchwork-Id: 13077537 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 24B2AC4332F for ; Tue, 20 Dec 2022 07:02:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233434AbiLTHCL (ORCPT ); Tue, 20 Dec 2022 02:02:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53336 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229746AbiLTHBh (ORCPT ); Tue, 20 Dec 2022 02:01:37 -0500 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8E9451581B; Mon, 19 Dec 2022 23:01:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1671519695; x=1703055695; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=HmlZIFRY86SsuxVZ3f2cHdcHUA8c4g3To7+jNRITrUo=; b=E6payz2VgowUdCzRGPgWkiXUWnis+v8GmVUqmj77PWlPp+p6gTAQzcps 4dHir9pP4YvgZtV5QlvFqITV+wU2VMi1z2MFL4S0Eubid/hGE6AsBObhP OPZQ5yhSj1vK6I7+lWYH5sm1tG4b7TlMLOjy5dyFCKholaFwBL6ss9Xks KJATmvjlNIP5iQKnU+zG5G2A3la2sNKV26mULpwZNh4N+N0o9KeZZ97NA i55qroHf2arNj7b1GjMWOaP3yVtTdcGe3IVbBkru5dPdsjziZGYPAingQ l9E7Kp4NQXqtpViVhKDBd0UDpN134exdaPrsmcD/lKvtlQdwiY3C9GxiL w==; X-IronPort-AV: E=McAfee;i="6500,9779,10566"; a="302972022" X-IronPort-AV: E=Sophos;i="5.96,258,1665471600"; d="scan'208";a="302972022" Received: from orsmga007.jf.intel.com ([10.7.209.58]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Dec 2022 23:01:13 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10566"; a="644326473" X-IronPort-AV: E=Sophos;i="5.96,258,1665471600"; d="scan'208";a="644326473" Received: from unknown (HELO fred..) ([172.25.112.68]) by orsmga007.jf.intel.com with ESMTP; 19 Dec 2022 23:01:13 -0800 From: Xin Li To: linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, peterz@infradead.org, andrew.cooper3@citrix.com, seanjc@google.com, pbonzini@redhat.com, ravi.v.shankar@intel.com Subject: [RFC PATCH 14/32] x86/fred: header file with FRED definitions Date: Mon, 19 Dec 2022 22:36:40 -0800 Message-Id: <20221220063658.19271-15-xin3.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221220063658.19271-1-xin3.li@intel.com> References: <20221220063658.19271-1-xin3.li@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: "H. Peter Anvin (Intel)" Add a header file for FRED prototypes and definitions. Signed-off-by: H. Peter Anvin (Intel) Signed-off-by: Xin Li --- arch/x86/include/asm/fred.h | 99 +++++++++++++++++++++++++++++++++++++ 1 file changed, 99 insertions(+) create mode 100644 arch/x86/include/asm/fred.h diff --git a/arch/x86/include/asm/fred.h b/arch/x86/include/asm/fred.h new file mode 100644 index 000000000000..6292b28d461d --- /dev/null +++ b/arch/x86/include/asm/fred.h @@ -0,0 +1,99 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * arch/x86/include/asm/fred.h + * + * Macros for Flexible Return and Event Delivery (FRED) + */ + +#ifndef ASM_X86_FRED_H +#define ASM_X86_FRED_H + +#ifdef CONFIG_X86_FRED + +#include +#include + +/* + * FRED return instructions + * + * Replace with "ERETS"/"ERETU" once binutils support FRED return instructions. + */ +#define ERETS _ASM_BYTES(0xf2,0x0f,0x01,0xca) +#define ERETU _ASM_BYTES(0xf3,0x0f,0x01,0xca) + +/* + * Event stack level macro for the FRED_STKLVLS MSR. + * Usage example: FRED_STKLVL(X86_TRAP_DF, 3) + * Multiple values can be ORd together. + */ +#define FRED_STKLVL(v,l) (_AT(unsigned long, l) << (2*(v))) + +/* FRED_CONFIG MSR */ +#define FRED_CONFIG_CSL_MASK 0x3 +#define FRED_CONFIG_SHADOW_STACK_SPACE _BITUL(3) +#define FRED_CONFIG_REDZONE(b) __ALIGN_KERNEL_MASK((b), _UL(0x3f)) +#define FRED_CONFIG_INT_STKLVL(l) (_AT(unsigned long, l) << 9) +#define FRED_CONFIG_ENTRYPOINT(p) _AT(unsigned long, (p)) + +/* FRED event type and vector bit width and counts */ +#define FRED_EVENT_TYPE_BITS 3 /* only 3 bits used in FRED 3.0 */ +#define FRED_EVENT_TYPE_COUNT _BITUL(FRED_EVENT_TYPE_BITS) +#define FRED_EVENT_VECTOR_BITS 8 +#define FRED_EVENT_VECTOR_COUNT _BITUL(FRED_EVENT_VECTOR_BITS) + +/* FRED EVENT_TYPE_OTHER vector numbers */ +#define FRED_SYSCALL 1 +#define FRED_SYSENTER 2 + +/* Flags above the CS selector (regs->csl) */ +#define FRED_CSL_ENABLE_NMI _BITUL(28) +#define FRED_CSL_ALLOW_SINGLE_STEP _BITUL(25) +#define FRED_CSL_INTERRUPT_SHADOW _BITUL(24) + +#ifndef __ASSEMBLY__ + +#include +#include + +/* FRED stack frame information */ +struct fred_info { + unsigned long edata; /* Event data: CR2, DR6, ... */ + unsigned long resv; +}; + +/* Full format of the FRED stack frame */ +struct fred_frame { + struct pt_regs regs; + struct fred_info info; +}; + +/* Getting the FRED frame information from a pt_regs pointer */ +static __always_inline struct fred_info *fred_info(struct pt_regs *regs) +{ + return &container_of(regs, struct fred_frame, regs)->info; +} + +static __always_inline unsigned long fred_event_data(struct pt_regs *regs) +{ + return fred_info(regs)->edata; +} + +/* + * How FRED event handlers are called. + * + * FRED event delivery establishes the full supervisor context + * by pushing everything related to the event being delivered + * to the FRED stack frame, e.g., the faulting linear address + * of a #PF is pushed as event data of the FRED #PF stack frame. + * Thus a struct pt_regs has everything needed and it's the only + * input parameter required for a FRED event handler. + */ +#define DECLARE_FRED_HANDLER(f) void f (struct pt_regs *regs) +#define DEFINE_FRED_HANDLER(f) noinstr DECLARE_FRED_HANDLER(f) +typedef DECLARE_FRED_HANDLER((*fred_handler)); + +#endif /* __ASSEMBLY__ */ + +#endif /* CONFIG_X86_FRED */ + +#endif /* ASM_X86_FRED_H */