Commit bbab4f3b authored by Zachary Amsden's avatar Zachary Amsden Committed by Andi Kleen
Browse files

[PATCH] i386: vMI timer patches 



VMI timer code.  It works by taking over the local APIC clock when APIC is
configured, which requires a couple hooks into the APIC code.  The backend
timer code could be commonized into the timer infrastructure, but there are
some pieces missing (stolen time, in particular), and the exact semantics of
when to do accounting for NO_IDLE need to be shared between different
hypervisors as well.  So for now, VMI timer is a separate module.

[Adrian Bunk: cleanups]

Subject: VMI timer patches
Signed-off-by: default avatarZachary Amsden <zach@vmware.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
parent 7ce0bcfd

arch/i386/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -1272,3 +1272,12 @@ config X86_TRAMPOLINE 
config KTIME_SCALAR

	bool

	default y



config NO_IDLE_HZ

	bool

	depends on PARAVIRT

	default y

	help

	  Switches the regular HZ timer off when the system is going idle.

	  This helps a hypervisor detect that the Linux system is idle,

	  reducing the overhead of idle systems.

arch/i386/kernel/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -40,7 +40,7 @@ obj-$(CONFIG_EARLY_PRINTK) += early_printk.o 
obj-$(CONFIG_HPET_TIMER) 	+= hpet.o

obj-$(CONFIG_K8_NB)		+= k8.o



obj-$(CONFIG_VMI)		+= vmi.o

obj-$(CONFIG_VMI)		+= vmi.o vmitime.o



# Make sure this is linked after any other paravirt_ops structs: see head.S

obj-$(CONFIG_PARAVIRT)		+= paravirt.o

arch/i386/kernel/apic.c

+1 −1
Original line number Diff line number Diff line
@@ -1395,7 +1395,7 @@ int __init APIC_init_uniprocessor (void) 
		if (!skip_ioapic_setup && nr_ioapics)

			setup_IO_APIC();

#endif

	setup_boot_APIC_clock();

	setup_boot_clock();



	return 0;

}

arch/i386/kernel/entry.S

+5 −0
Original line number Diff line number Diff line
@@ -626,6 +626,11 @@ ENTRY(name) \ 
/* The include is where all of the SMP etc. interrupts come from */

#include "entry_arch.h"



/* This alternate entry is needed because we hijack the apic LVTT */

#if defined(CONFIG_VMI) && defined(CONFIG_X86_LOCAL_APIC)

BUILD_INTERRUPT(apic_vmi_timer_interrupt,LOCAL_TIMER_VECTOR)

#endif



KPROBE_ENTRY(page_fault)

	RING0_EC_FRAME

	pushl $do_page_fault

arch/i386/kernel/paravirt.c

+2 −0
Original line number Diff line number Diff line
@@ -544,6 +544,8 @@ struct paravirt_ops paravirt_ops = { 
	.apic_write = native_apic_write,

	.apic_write_atomic = native_apic_write_atomic,

	.apic_read = native_apic_read,

	.setup_boot_clock = setup_boot_APIC_clock,

	.setup_secondary_clock = setup_secondary_APIC_clock,

#endif

	.set_lazy_mode = (void *)native_nop,

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