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Message-Id: <20230731063317.3720-11-xin3.li@intel.com>
Date: Sun, 30 Jul 2023 23:32:51 -0700
From: Xin Li <xin3.li@...el.com>
To: linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-edac@...r.kernel.org, linux-hyperv@...r.kernel.org,
kvm@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc: Jonathan Corbet <corbet@....net>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
"H . Peter Anvin" <hpa@...or.com>,
Andy Lutomirski <luto@...nel.org>,
Oleg Nesterov <oleg@...hat.com>,
Tony Luck <tony.luck@...el.com>,
"K . Y . Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Sean Christopherson <seanjc@...gle.com>,
Peter Zijlstra <peterz@...radead.org>,
Juergen Gross <jgross@...e.com>,
Stefano Stabellini <sstabellini@...nel.org>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
Josh Poimboeuf <jpoimboe@...nel.org>,
"Paul E . McKenney" <paulmck@...nel.org>,
Catalin Marinas <catalin.marinas@....com>,
Randy Dunlap <rdunlap@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
Kim Phillips <kim.phillips@....com>,
Xin Li <xin3.li@...el.com>,
Hyeonggon Yoo <42.hyeyoo@...il.com>,
"Liam R . Howlett" <Liam.Howlett@...cle.com>,
Sebastian Reichel <sebastian.reichel@...labora.com>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Suren Baghdasaryan <surenb@...gle.com>,
Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
Jiaxi Chen <jiaxi.chen@...ux.intel.com>,
Babu Moger <babu.moger@....com>,
Jim Mattson <jmattson@...gle.com>,
Sandipan Das <sandipan.das@....com>,
Lai Jiangshan <jiangshanlai@...il.com>,
Hans de Goede <hdegoede@...hat.com>,
Reinette Chatre <reinette.chatre@...el.com>,
Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
Breno Leitao <leitao@...ian.org>,
Nikunj A Dadhania <nikunj@....com>,
Brian Gerst <brgerst@...il.com>,
Sami Tolvanen <samitolvanen@...gle.com>,
Alexander Potapenko <glider@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Arnd Bergmann <arnd@...db.de>,
"Eric W . Biederman" <ebiederm@...ssion.com>,
Kees Cook <keescook@...omium.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Masahiro Yamada <masahiroy@...nel.org>,
Ze Gao <zegao2021@...il.com>, Fei Li <fei1.li@...el.com>,
Conghui <conghui.chen@...el.com>,
Ashok Raj <ashok.raj@...el.com>,
"Jason A . Donenfeld" <Jason@...c4.com>,
Mark Rutland <mark.rutland@....com>,
Jacob Pan <jacob.jun.pan@...ux.intel.com>,
Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>,
Jane Malalane <jane.malalane@...rix.com>,
David Woodhouse <dwmw@...zon.co.uk>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Yantengsi <siyanteng@...ngson.cn>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Sathvika Vasireddy <sv@...ux.ibm.com>
Subject: [PATCH v9 10/36] x86/fred: Add a new header file for FRED definitions
From: "H. Peter Anvin (Intel)" <hpa@...or.com>
Add a header file for FRED prototypes and definitions.
Signed-off-by: H. Peter Anvin (Intel) <hpa@...or.com>
Tested-by: Shan Kang <shan.kang@...el.com>
Signed-off-by: Xin Li <xin3.li@...el.com>
---
Changes since v6:
* Replace pt_regs csx flags prefix FRED_CSL_ with FRED_CSX_.
---
arch/x86/include/asm/fred.h | 104 ++++++++++++++++++++++++++++++++++++
1 file changed, 104 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..d76e681a806f
--- /dev/null
+++ b/arch/x86/include/asm/fred.h
@@ -0,0 +1,104 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Macros for Flexible Return and Event Delivery (FRED)
+ */
+
+#ifndef ASM_X86_FRED_H
+#define ASM_X86_FRED_H
+
+#include <linux/const.h>
+#include <asm/asm.h>
+
+/*
+ * FRED return instructions
+ *
+ * Replace with "ERETS"/"ERETU" once binutils support FRED return instructions.
+ * The binutils version supporting FRED instructions is still TBD, and will
+ * update once we have it.
+ */
+#define ERETS _ASM_BYTES(0xf2,0x0f,0x01,0xca)
+#define ERETU _ASM_BYTES(0xf3,0x0f,0x01,0xca)
+
+/*
+ * RSP is aligned to a 64-byte boundary before used to push a new stack frame
+ */
+#define FRED_STACK_FRAME_RSP_MASK _AT(unsigned long, (~0x3f))
+
+/*
+ * 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
+/*
+ * Used for the return address for call emulation during code patching,
+ * and measured in 64-byte cache lines.
+ */
+#define FRED_CONFIG_REDZONE_AMOUNT 1
+#define FRED_CONFIG_REDZONE (_AT(unsigned long, FRED_CONFIG_REDZONE_AMOUNT) << 6)
+#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.
+ *
+ * There is space in the stack frame making it possible to extend event type
+ * and vector fields in the future.
+ */
+#define FRED_EVENT_TYPE_BITS 3
+#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
+#define FRED_NUM_OTHER_VECTORS 3
+
+/* Flags above the SS selector (regs->ssx) */
+#define FRED_SSX_INTERRUPT_SHADOW_BIT 16
+#define FRED_SSX_INTERRUPT_SHADOW _BITUL(FRED_SSX_INTERRUPT_SHADOW_BIT)
+#define FRED_SSX_SOFTWARE_INITIATED_BIT 17
+#define FRED_SSX_SOFTWARE_INITIATED _BITUL(FRED_SSX_SOFTWARE_INITIATED_BIT)
+#define FRED_SSX_NMI_BIT 18
+#define FRED_SSX_NMI _BITUL(FRED_SSX_NMI_BIT)
+#define FRED_SSX_64_BIT_MODE_BIT 57
+#define FRED_SSX_64_BIT_MODE _BITUL(FRED_SSX_64_BIT_MODE_BIT)
+
+#ifdef CONFIG_X86_FRED
+
+#ifndef __ASSEMBLY__
+
+#include <linux/kernel.h>
+#include <asm/ptrace.h>
+
+struct fred_info {
+ /* Event data: CR2, DR6, ... */
+ unsigned long edata;
+ unsigned long resv;
+};
+
+/* Full format of the FRED stack frame */
+struct fred_frame {
+ struct pt_regs regs;
+ struct fred_info info;
+};
+
+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;
+}
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* CONFIG_X86_FRED */
+
+#endif /* ASM_X86_FRED_H */
--
2.34.1
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