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x86/xen: Support early interrupts in xen pv guests

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Add early interrupt handlers activated by idt_setup_early_handler() to
the handlers supported by Xen pv guests. This will allow for early
WARN() calls not crashing the guest.

Suggested-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: xen-devel@lists.xenproject.org
Cc: boris.ostrovsky@oracle.com
Link: https://lkml.kernel.org/r/20171124084221.30172-1-jgross@suse.com
This commit is contained in:
Juergen Gross
2017-11-24 09:42:21 +01:00
committed by Thomas Gleixner
parent 9d0b62328d
commit 42b3a4cb56
4 changed files with 53 additions and 14 deletions
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12
arch/x86/include/asm/segment.h
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@@ -236,11 +236,23 @@
*/
#define EARLY_IDT_HANDLER_SIZE 9
/*
* xen_early_idt_handler_array is for Xen pv guests: for each entry in
* early_idt_handler_array it contains a prequel in the form of
* pop %rcx; pop %r11; jmp early_idt_handler_array[i]; summing up to
* max 8 bytes.
*/
#define XEN_EARLY_IDT_HANDLER_SIZE 8
#ifndef __ASSEMBLY__
extern const char early_idt_handler_array[NUM_EXCEPTION_VECTORS][EARLY_IDT_HANDLER_SIZE];
extern void early_ignore_irq(void);
#if defined(CONFIG_X86_64) && defined(CONFIG_XEN_PV)
extern const char xen_early_idt_handler_array[NUM_EXCEPTION_VECTORS][XEN_EARLY_IDT_HANDLER_SIZE];
#endif
/*
* Load a segment. Fall back on loading the zero segment if something goes
* wrong. This variant assumes that loading zero fully clears the segment.