From 47ae4b05d0fa2f2a998ebaf34d2dcbffca56a9db Mon Sep 17 00:00:00 2001 From: Juergen Gross Date: Mon, 29 Aug 2016 08:48:43 +0200 Subject: [PATCH] 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: Juergen Gross Signed-off-by: Peter Zijlstra (Intel) Cc: Douglas_Warzecha@dell.com Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner 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 --- MAINTAINERS | 1 + arch/x86/include/asm/hypervisor.h | 4 ++++ arch/x86/kernel/cpu/hypervisor.c | 11 +++++++++++ include/linux/hypervisor.h | 17 +++++++++++++++++ kernel/smp.c | 1 + kernel/up.c | 1 + 6 files changed, 35 insertions(+) create mode 100644 include/linux/hypervisor.h diff --git a/MAINTAINERS b/MAINTAINERS index db814a89599c..95151aab3445 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -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 diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h index 055ea9941dd5..67942b6ad4b7 100644 --- a/arch/x86/include/asm/hypervisor.h +++ b/arch/x86/include/asm/hypervisor.h @@ -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) { } diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervisor.c index 27e46658ebe3..35691a6b0d32 100644 --- a/arch/x86/kernel/cpu/hypervisor.c +++ b/arch/x86/kernel/cpu/hypervisor.c @@ -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"); +} diff --git a/include/linux/hypervisor.h b/include/linux/hypervisor.h new file mode 100644 index 000000000000..3fa5ef2b3759 --- /dev/null +++ b/include/linux/hypervisor.h @@ -0,0 +1,17 @@ +#ifndef __LINUX_HYPEVISOR_H +#define __LINUX_HYPEVISOR_H + +/* + * Generic Hypervisor support + * Juergen Gross + */ + +#ifdef CONFIG_HYPERVISOR_GUEST +#include +#else +static inline void hypervisor_pin_vcpu(int cpu) +{ +} +#endif + +#endif /* __LINUX_HYPEVISOR_H */ diff --git a/kernel/smp.c b/kernel/smp.c index 3aa642d39c03..4274ca5f3bbc 100644 --- a/kernel/smp.c +++ b/kernel/smp.c @@ -14,6 +14,7 @@ #include #include #include +#include #include "smpboot.h" diff --git a/kernel/up.c b/kernel/up.c index 1760bf3d1463..3ccee2bd13ba 100644 --- a/kernel/up.c +++ b/kernel/up.c @@ -6,6 +6,7 @@ #include #include #include +#include int smp_call_function_single(int cpu, void (*func) (void *info), void *info, int wait) -- 2.20.1