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Message-Id: <20230731063317.3720-26-xin3.li@intel.com>
Date: Sun, 30 Jul 2023 23:33:06 -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 25/36] x86/traps: Add a system interrupt handler table for system interrupt dispatch
From: "H. Peter Anvin (Intel)" <hpa@...or.com>
On x86, external interrupts can be categorized into two groups:
1) System interrupts
2) External device interrupts
All external device interrupts are directed to the common_interrupt(),
which, in turn, dispatches these external device interrupts using a
per-CPU external device interrupt dispatch table vector_irq.
To handle system interrupts, a system interrupt handler table needs to
be introduced. This table enables the direct dispatching of a system
interrupt to its corresponding handler. As a result, a software-based
dispatch function will be implemented as:
void external_interrupt(struct pt_regs *regs)
{
u8 vector = regs->vector;
if (is_system_interrupt(vector))
system_interrupt_handlers[vector_to_sysvec(vector)](regs);
else /* external device interrupt */
common_interrupt(regs);
}
Signed-off-by: H. Peter Anvin (Intel) <hpa@...or.com>
Co-developed-by: Xin Li <xin3.li@...el.com>
Tested-by: Shan Kang <shan.kang@...el.com>
Signed-off-by: Xin Li <xin3.li@...el.com>
---
Changes since v8:
* Remove junk code that assumes no local APIC on x86_64 (Thomas Gleixner).
Changes since v5:
* Initialize system_interrupt_handlers with dispatch_table_spurious_interrupt()
instead of NULL to get rid of any NULL check (Peter Zijlstra).
---
arch/x86/kernel/traps.c | 50 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 49dd92458eb0..e430a8c47931 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -1488,6 +1488,56 @@ DEFINE_IDTENTRY_SW(iret_error)
}
#endif
+#ifdef CONFIG_X86_64
+
+static void dispatch_table_spurious_interrupt(struct pt_regs *regs)
+{
+ dispatch_spurious_interrupt(regs, regs->vector);
+}
+
+#define SYSV(x,y) [(x) - FIRST_SYSTEM_VECTOR] = y
+
+static system_interrupt_handler system_interrupt_handlers[NR_SYSTEM_VECTORS] = {
+ [0 ... NR_SYSTEM_VECTORS-1] = dispatch_table_spurious_interrupt,
+#ifdef CONFIG_SMP
+ SYSV(RESCHEDULE_VECTOR, dispatch_table_sysvec_reschedule_ipi),
+ SYSV(CALL_FUNCTION_VECTOR, dispatch_table_sysvec_call_function),
+ SYSV(CALL_FUNCTION_SINGLE_VECTOR, dispatch_table_sysvec_call_function_single),
+ SYSV(REBOOT_VECTOR, dispatch_table_sysvec_reboot),
+#endif
+
+#ifdef CONFIG_X86_THERMAL_VECTOR
+ SYSV(THERMAL_APIC_VECTOR, dispatch_table_sysvec_thermal),
+#endif
+
+#ifdef CONFIG_X86_MCE_THRESHOLD
+ SYSV(THRESHOLD_APIC_VECTOR, dispatch_table_sysvec_threshold),
+#endif
+
+#ifdef CONFIG_X86_MCE_AMD
+ SYSV(DEFERRED_ERROR_VECTOR, dispatch_table_sysvec_deferred_error),
+#endif
+
+#ifdef CONFIG_X86_LOCAL_APIC
+ SYSV(LOCAL_TIMER_VECTOR, dispatch_table_sysvec_apic_timer_interrupt),
+ SYSV(X86_PLATFORM_IPI_VECTOR, dispatch_table_sysvec_x86_platform_ipi),
+# ifdef CONFIG_HAVE_KVM
+ SYSV(POSTED_INTR_VECTOR, dispatch_table_sysvec_kvm_posted_intr_ipi),
+ SYSV(POSTED_INTR_WAKEUP_VECTOR, dispatch_table_sysvec_kvm_posted_intr_wakeup_ipi),
+ SYSV(POSTED_INTR_NESTED_VECTOR, dispatch_table_sysvec_kvm_posted_intr_nested_ipi),
+# endif
+# ifdef CONFIG_IRQ_WORK
+ SYSV(IRQ_WORK_VECTOR, dispatch_table_sysvec_irq_work),
+# endif
+ SYSV(SPURIOUS_APIC_VECTOR, dispatch_table_sysvec_spurious_apic_interrupt),
+ SYSV(ERROR_APIC_VECTOR, dispatch_table_sysvec_error_interrupt),
+#endif
+};
+
+#undef SYSV
+
+#endif /* CONFIG_X86_64 */
+
void __init trap_init(void)
{
/* Init cpu_entry_area before IST entries are set up */
--
2.34.1
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