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x86/idt: Hide set_intr_gate()

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set_intr_gate() is an internal function of the IDT code. The only user left
is the KVM code which replaces the pagefault handler eventually.

Provide an explicit update_intr_gate() function and make set_intr_gate()
static. While at it replace the magic number 14 in the KVM code with the
proper trap define.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/r/20170828064959.663008004@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Thomas Gleixner 2017-08-28 08:47:59 +02:00 committed by Ingo Molnar
parent 4447ac1195
commit facaa3e3c8
3 changed files with 22 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/desc.h
View File

@ -390,7 +390,7 @@ static inline void set_desc_limit(struct desc_struct *desc, unsigned long limit)
desc->limit1 = (limit >> 16) & 0xf;
}
void set_intr_gate(unsigned int n, const void *addr);
void update_intr_gate(unsigned int n, const void *addr);
void alloc_intr_gate(unsigned int n, const void *addr);
extern unsigned long used_vectors[];

33
arch/x86/kernel/idt.c
View File

@ -225,6 +225,22 @@ idt_setup_from_table(gate_desc *idt, const struct idt_data *t, int size, bool sy
}
}
static void set_intr_gate(unsigned int n, const void *addr)
{
struct idt_data data;
BUG_ON(n > 0xFF);
memset(&data, 0, sizeof(data));
data.vector = n;
data.addr = addr;
data.segment = __KERNEL_CS;
data.bits.type = GATE_INTERRUPT;
data.bits.p = 1;
idt_setup_from_table(idt_table, &data, 1, false);
}
/**
* idt_setup_early_traps - Initialize the idt table with early traps
*
@ -336,20 +352,11 @@ void idt_invalidate(void *addr)
load_idt(&idt);
}
void set_intr_gate(unsigned int n, const void *addr)
void __init update_intr_gate(unsigned int n, const void *addr)
{
struct idt_data data;
BUG_ON(n > 0xFF);
memset(&data, 0, sizeof(data));
data.vector = n;
data.addr = addr;
data.segment = __KERNEL_CS;
data.bits.type = GATE_INTERRUPT;
data.bits.p = 1;
idt_setup_from_table(idt_table, &data, 1, false);
if (WARN_ON_ONCE(!test_bit(n, used_vectors)))
return;
set_intr_gate(n, addr);
}
void alloc_intr_gate(unsigned int n, const void *addr)

2
arch/x86/kernel/kvm.c
View File

@ -455,7 +455,7 @@ static int kvm_cpu_down_prepare(unsigned int cpu)
static void __init kvm_apf_trap_init(void)
{
set_intr_gate(14, async_page_fault);
update_intr_gate(X86_TRAP_PF, async_page_fault);
}
void __init kvm_guest_init(void)