linux-kernel - [patch 11/15] x86/entry: Convert XEN hypercall vector to IDTENTRY

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Date:   Tue, 25 Feb 2020 23:47:30 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Steven Rostedt <rostedt@...dmis.org>,
        Brian Gerst <brgerst@...il.com>,
        Juergen Gross <jgross@...e.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: [patch 11/15] x86/entry: Convert XEN hypercall vector to IDTENTRY_SYSVEC

Convert the last oldstyle defined vector to IDTENTRY_SYSVEC
  - Implement the C entry point with DEFINE_IDTENTRY_SYSVEC
  - Emit the ASM stub with DECLARE_IDTENTRY_SYSVEC
  - Remove the ASM idtentries in 64bit
  - Remove the BUILD_INTERRUPT entries in 32bit
  - Remove the old prototyoes

Fixup the related XEN code by providing the primary C entry point in x86 to
avoid cluttering the generic code with X86'isms.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/entry/entry_32.S        |    5 -----
 arch/x86/entry/entry_64.S        |    5 -----
 arch/x86/include/asm/idtentry.h  |    4 ++++
 arch/x86/xen/enlighten_hvm.c     |    6 ++++++
 drivers/xen/events/events_base.c |    3 ++-
 include/xen/events.h             |    7 -------
 6 files changed, 12 insertions(+), 18 deletions(-)

--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1375,11 +1375,6 @@ SYM_FUNC_START(xen_failsafe_callback)
 SYM_FUNC_END(xen_failsafe_callback)
 #endif /* CONFIG_XEN_PV */
 
-#ifdef CONFIG_XEN_PVHVM
-BUILD_INTERRUPT3(xen_hvm_callback_vector, HYPERVISOR_CALLBACK_VECTOR,
-		 xen_evtchn_do_upcall)
-#endif
-
 SYM_CODE_START_LOCAL_NOALIGN(common_exception)
 	/* the function address is in %gs's slot on the stack */
 	SAVE_ALL switch_stacks=1 skip_gs=1 unwind_espfix=1
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1125,11 +1125,6 @@ SYM_CODE_START(xen_failsafe_callback)
 SYM_CODE_END(xen_failsafe_callback)
 #endif /* CONFIG_XEN_PV */
 
-#ifdef CONFIG_XEN_PVHVM
-apicinterrupt3 HYPERVISOR_CALLBACK_VECTOR \
-	xen_hvm_callback_vector xen_evtchn_do_upcall
-#endif
-
 /*
  * Save all registers in pt_regs, and switch gs if needed.
  * Use slow, but surefire "are we in kernel?" check.
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -536,6 +536,10 @@ DECLARE_IDTENTRY_SYSVEC(HYPERVISOR_STIME
 DECLARE_IDTENTRY_SYSVEC(HYPERVISOR_CALLBACK_VECTOR,	sysvec_acrn_hv_callback);
 #endif
 
+#ifdef CONFIG_XEN_PVHVM
+DECLARE_IDTENTRY_SYSVEC(HYPERVISOR_CALLBACK_VECTOR,	sysvec_xen_hvm_callback);
+#endif
+
 #ifdef CONFIG_X86_MCE
 /* Machine check */
 DECLARE_IDTENTRY_MCE(X86_TRAP_MC,	exc_machine_check);
--- a/arch/x86/xen/enlighten_hvm.c
+++ b/arch/x86/xen/enlighten_hvm.c
@@ -13,6 +13,7 @@
 #include <asm/smp.h>
 #include <asm/reboot.h>
 #include <asm/setup.h>
+#include <asm/idtentry.h>
 #include <asm/hypervisor.h>
 #include <asm/e820/api.h>
 #include <asm/early_ioremap.h>
@@ -118,6 +119,11 @@ static void __init init_hvm_pv_info(void
 		this_cpu_write(xen_vcpu_id, smp_processor_id());
 }
 
+DEFINE_IDTENTRY_SYSVEC(sysvec_xen_hvm_callback)
+{
+	xen_evtchn_do_upcall(regs);
+}
+
 #ifdef CONFIG_KEXEC_CORE
 static void xen_hvm_shutdown(void)
 {
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -37,6 +37,7 @@
 #ifdef CONFIG_X86
 #include <asm/desc.h>
 #include <asm/ptrace.h>
+#include <asm/idtentry.h>
 #include <asm/irq.h>
 #include <asm/io_apic.h>
 #include <asm/i8259.h>
@@ -1651,7 +1652,7 @@ void xen_callback_vector(void)
 		}
 		pr_info_once("Xen HVM callback vector for event delivery is enabled\n");
 		alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
-				xen_hvm_callback_vector);
+				asm_sysvec_xen_hvm_callback);
 	}
 }
 #else
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -90,13 +90,6 @@ unsigned irq_from_evtchn(unsigned int ev
 int irq_from_virq(unsigned int cpu, unsigned int virq);
 unsigned int evtchn_from_irq(unsigned irq);
 
-#ifdef CONFIG_XEN_PVHVM
-/* Xen HVM evtchn vector callback */
-void xen_hvm_callback_vector(void);
-#ifdef CONFIG_TRACING
-#define trace_xen_hvm_callback_vector xen_hvm_callback_vector
-#endif
-#endif
 int xen_set_callback_via(uint64_t via);
 void xen_evtchn_do_upcall(struct pt_regs *regs);
 void xen_hvm_evtchn_do_upcall(void);