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Commit 47ae4b05 authored by Juergen Gross's avatar Juergen Gross Committed by Ingo Molnar
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virt, sched: Add generic vCPU pinning support 



Add generic virtualization support for pinning the current vCPU to a
specified physical CPU. As this operation isn't performance critical
(a very limited set of operations like BIOS calls and SMIs is expected
to need this) just add a hypervisor specific indirection.

Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Douglas_Warzecha@dell.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: akataria@vmware.com
Cc: boris.ostrovsky@oracle.com
Cc: chrisw@sous-sol.org
Cc: david.vrabel@citrix.com
Cc: hpa@zytor.com
Cc: jdelvare@suse.com
Cc: jeremy@goop.org
Cc: linux@roeck-us.net
Cc: pali.rohar@gmail.com
Cc: rusty@rustcorp.com.au
Cc: virtualization@lists.linux-foundation.org
Cc: xen-devel@lists.xenproject.org
Link: http://lkml.kernel.org/r/1472453327-19050-3-git-send-email-jgross@suse.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 3260ab56

MAINTAINERS

+1 −0
Original line number Diff line number Diff line
@@ -8845,6 +8845,7 @@ S: Supported 
F:	Documentation/virtual/paravirt_ops.txt

F:	arch/*/kernel/paravirt*

F:	arch/*/include/asm/paravirt.h

F:	include/linux/hypervisor.h



PARIDE DRIVERS FOR PARALLEL PORT IDE DEVICES

M:	Tim Waugh <tim@cyberelk.net>

arch/x86/include/asm/hypervisor.h

+4 −0
Original line number Diff line number Diff line
@@ -43,6 +43,9 @@ struct hypervisor_x86 { 


	/* X2APIC detection (run once per boot) */

	bool		(*x2apic_available)(void);



	/* pin current vcpu to specified physical cpu (run rarely) */

	void		(*pin_vcpu)(int);

};



extern const struct hypervisor_x86 *x86_hyper;
@@ -56,6 +59,7 @@ extern const struct hypervisor_x86 x86_hyper_kvm; 
extern void init_hypervisor(struct cpuinfo_x86 *c);

extern void init_hypervisor_platform(void);

extern bool hypervisor_x2apic_available(void);

extern void hypervisor_pin_vcpu(int cpu);

#else

static inline void init_hypervisor(struct cpuinfo_x86 *c) { }

static inline void init_hypervisor_platform(void) { }

arch/x86/kernel/cpu/hypervisor.c

+11 −0
Original line number Diff line number Diff line
@@ -86,3 +86,14 @@ bool __init hypervisor_x2apic_available(void) 
	       x86_hyper->x2apic_available &&

	       x86_hyper->x2apic_available();

}



void hypervisor_pin_vcpu(int cpu)

{

	if (!x86_hyper)

		return;



	if (x86_hyper->pin_vcpu)

		x86_hyper->pin_vcpu(cpu);

	else

		WARN_ONCE(1, "vcpu pinning requested but not supported!\n");

}

include/linux/hypervisor.h

0 → 100644
+17 −0
Original line number Diff line number Diff line 
#ifndef __LINUX_HYPEVISOR_H

#define __LINUX_HYPEVISOR_H



/*

 *	Generic Hypervisor support

 *		Juergen Gross <jgross@suse.com>

 */



#ifdef CONFIG_HYPERVISOR_GUEST

#include <asm/hypervisor.h>

#else

static inline void hypervisor_pin_vcpu(int cpu)

{

}

#endif



#endif /* __LINUX_HYPEVISOR_H */

kernel/smp.c

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <linux/smp.h>

#include <linux/cpu.h>

#include <linux/sched.h>

#include <linux/hypervisor.h>



#include "smpboot.h"