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virt, sched: Add generic vCPU pinning support

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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: Juergen Gross <jgross@suse.com>
Signed-off-by: Peter 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: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Juergen Gross 2016-08-29 08:48:43 +02:00 committed by Ingo Molnar
parent 3260ab5616
commit 47ae4b05d0
6 changed files with 35 additions and 0 deletions
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1
MAINTAINERS
View file

@ -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>

4
arch/x86/include/asm/hypervisor.h
View file

@ -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) { }

11
arch/x86/kernel/cpu/hypervisor.c
View file

@ -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");
}

17
include/linux/hypervisor.h Normal file
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@ -0,0 +1,17 @@
#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 */

1
kernel/smp.c
View file

@ -14,6 +14,7 @@
#include <linux/smp.h>
#include <linux/cpu.h>
#include <linux/sched.h>
#include <linux/hypervisor.h>
#include "smpboot.h"

1
kernel/up.c
View file

@ -6,6 +6,7 @@
#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/smp.h>
#include <linux/hypervisor.h>
int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
int wait)