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Date: Wed, 29 Jul 2015 01:41:20 -0400
From: Brian Gerst <brgerst@...il.com>
To: x86@...nel.org, linux-kernel@...r.kernel.org
Cc: Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
Denys Vlasenko <dvlasenk@...hat.com>,
Andy Lutomirski <luto@...capital.net>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 5/8] x86/vm86: Add a separate config option for hardware IRQ handling
Allow disabling hardware interrupt support for vm86.
Signed-off-by: Brian Gerst <brgerst@...il.com>
---
arch/x86/Kconfig | 8 ++++++++
arch/x86/include/asm/irq_vectors.h | 10 ----------
arch/x86/include/asm/vm86.h | 20 ++++++++++++++++++--
arch/x86/kernel/vm86_32.c | 12 ++++++++++--
4 files changed, 36 insertions(+), 14 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index cbd2d62..7c7ec31 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1067,6 +1067,14 @@ config VM86
bool
default X86_LEGACY_VM86
+config VM86_INTERRUPTS
+ bool "Enable VM86 interrupt support"
+ default y
+ depends on VM86
+ ---help---
+ This option allows VM86 programs to request interrupts for
+ real mode hardware drivers.
+
config X86_16BIT
bool "Enable support for 16-bit segments" if EXPERT
default y
diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
index 4c2d2eb..6ca9fd6 100644
--- a/arch/x86/include/asm/irq_vectors.h
+++ b/arch/x86/include/asm/irq_vectors.h
@@ -117,16 +117,6 @@
#define FPU_IRQ 13
-#define FIRST_VM86_IRQ 3
-#define LAST_VM86_IRQ 15
-
-#ifndef __ASSEMBLY__
-static inline int invalid_vm86_irq(int irq)
-{
- return irq < FIRST_VM86_IRQ || irq > LAST_VM86_IRQ;
-}
-#endif
-
/*
* Size the maximum number of interrupts.
*
diff --git a/arch/x86/include/asm/vm86.h b/arch/x86/include/asm/vm86.h
index dd45aa1..05f6394 100644
--- a/arch/x86/include/asm/vm86.h
+++ b/arch/x86/include/asm/vm86.h
@@ -49,7 +49,6 @@ int handle_vm86_trap(struct kernel_vm86_regs *, long, int);
void save_v86_state(struct kernel_vm86_regs *, int);
struct task_struct;
-void release_vm86_irqs(struct task_struct *);
#define free_vm86(t) do { \
struct thread_struct *__t = (t); \
@@ -62,7 +61,6 @@ void release_vm86_irqs(struct task_struct *);
#else
#define handle_vm86_fault(a, b)
-#define release_vm86_irqs(a)
static inline int handle_vm86_trap(struct kernel_vm86_regs *a, long b, int c)
{
@@ -75,4 +73,22 @@ static inline void save_v86_state(struct kernel_vm86_regs *, int) { }
#endif /* CONFIG_VM86 */
+#ifdef CONFIG_VM86_INTERRUPTS
+
+#define FIRST_VM86_IRQ 3
+#define LAST_VM86_IRQ 15
+
+static inline int invalid_vm86_irq(int irq)
+{
+ return irq < FIRST_VM86_IRQ || irq > LAST_VM86_IRQ;
+}
+
+void release_vm86_irqs(struct task_struct *);
+
+#else /* CONFIG_VM86_INTERRUPTS */
+
+static inline void release_vm86_irqs(struct task_struct *tsk) { }
+
+#endif /* CONFIG_VM86_INTERRUPTS */
+
#endif /* _ASM_X86_VM86_H */
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
index ffe98ec..9cdd33c 100644
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -189,8 +189,15 @@ out:
}
-
+#ifdef CONFIG_VM86_INTERRUPTS
static int do_vm86_irq_handling(int subfunction, int irqnumber);
+#else
+static inline int do_vm86_irq_handling(int subfunction, int irqnumber)
+{
+ return -EINVAL;
+}
+#endif
+
static long do_sys_vm86(struct vm86plus_struct __user *v86, bool plus);
SYSCALL_DEFINE1(vm86old, struct vm86_struct __user *, v86)
@@ -713,6 +720,7 @@ simulate_sigsegv:
save_v86_state(regs, VM86_UNKNOWN);
}
+#ifdef CONFIG_VM86_INTERRUPTS
/* ---------------- vm86 special IRQ passing stuff ----------------- */
#define VM86_IRQNAME "vm86irq"
@@ -828,4 +836,4 @@ static int do_vm86_irq_handling(int subfunction, int irqnumber)
}
return -EINVAL;
}
-
+#endif
--
2.4.3
--
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