From: Juergen Gross <jgross@suse.com>
To: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org
Cc: Juergen Gross <jgross@suse.com>,
jeremy@goop.org, jdelvare@suse.com, peterz@infradead.org,
hpa@zytor.com, akataria@vmware.com, x86@kernel.org,
rusty@rustcorp.com.au, virtualization@lists.linux-foundation.org,
chrisw@sous-sol.org, mingo@redhat.com, david.vrabel@citrix.com,
Douglas_Warzecha@dell.com, pali.rohar@gmail.com,
boris.ostrovsky@oracle.com, tglx@linutronix.de,
linux@roeck-us.net
Subject: [PATCH v4 2/6] virt, sched: add generic vcpu pinning support
Date: Tue, 5 Apr 2016 07:10:03 +0200 [thread overview]
Message-ID: <1459833007-11618-3-git-send-email-jgross__27475.1490368091$1459833116$gmane$org@suse.com> (raw)
In-Reply-To: <1459833007-11618-1-git-send-email-jgross@suse.com>
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>
---
V4: move this patch some places up in the series
WARN_ONCE in case platform doesn't support pinning as requested by
Peter Zijlstra
V3: use getc_cpu()/put_cpu() as suggested by David Vrabel
V2: adapt to using workqueues
add include/linux/hypervisor.h to hide architecture specific stuff
from generic kernel code
In case paravirt maintainers don't want to be responsible for
include/linux/hypervisor.h I could take it.
---
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 2ec5079..959173e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -8330,6 +8330,7 @@ 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>
diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hypervisor.h
index 055ea99..67942b6 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 73d391a..ff108f8 100644
--- a/arch/x86/kernel/cpu/hypervisor.c
+++ b/arch/x86/kernel/cpu/hypervisor.c
@@ -85,3 +85,14 @@ 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 0000000..3fa5ef2
--- /dev/null
+++ b/include/linux/hypervisor.h
@@ -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 */
diff --git a/kernel/smp.c b/kernel/smp.c
index 7416544..9388064 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -14,6 +14,7 @@
#include <linux/smp.h>
#include <linux/cpu.h>
#include <linux/sched.h>
+#include <linux/hypervisor.h>
#include "smpboot.h"
diff --git a/kernel/up.c b/kernel/up.c
index 1760bf3..3ccee2b 100644
--- a/kernel/up.c
+++ b/kernel/up.c
@@ -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)
--
2.6.2
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next prev parent reply other threads:[~2016-04-05 5:10 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1459833007-11618-1-git-send-email-jgross@suse.com>
2016-04-05 5:10 ` [PATCH v4 1/6] xen: sync xen header Juergen Gross
2016-04-05 5:10 ` Juergen Gross [this message]
2016-04-05 5:10 ` [PATCH v4 3/6] smp: add function to execute a function synchronously on a cpu Juergen Gross
2016-04-05 5:10 ` [PATCH v4 4/6] xen: add xen_pin_vcpu() to support calling functions on a dedicated pcpu Juergen Gross
2016-04-05 5:10 ` [PATCH v4 5/6] dcdbas: make use of smp_call_on_cpu() Juergen Gross
2016-04-05 5:10 ` [PATCH v4 6/6] hwmon: use smp_call_on_cpu() for dell-smm i8k Juergen Gross
[not found] ` <1459833007-11618-4-git-send-email-jgross@suse.com>
2016-04-05 8:11 ` [PATCH v4 3/6] smp: add function to execute a function synchronously on a cpu Peter Zijlstra
[not found] ` <20160405081107.GH3448@twins.programming.kicks-ass.net>
2016-04-05 10:05 ` Juergen Gross
[not found] ` <1459833007-11618-2-git-send-email-jgross@suse.com>
2016-04-05 9:34 ` [PATCH v4 1/6] xen: sync xen header David Vrabel
[not found] ` <1459833007-11618-5-git-send-email-jgross@suse.com>
2016-04-05 9:45 ` [PATCH v4 4/6] xen: add xen_pin_vcpu() to support calling functions on a dedicated pcpu David Vrabel
[not found] ` <57038927.1030205@citrix.com>
2016-04-05 10:01 ` Juergen Gross
[not found] ` <57038D0E.1040708@suse.com>
2016-04-05 10:03 ` David Vrabel
[not found] ` <1459833007-11618-7-git-send-email-jgross@suse.com>
2016-04-05 14:54 ` [PATCH v4 6/6] hwmon: use smp_call_on_cpu() for dell-smm i8k Guenter Roeck
[not found] ` <20160405145414.GB27359@roeck-us.net>
2016-04-05 19:31 ` Pali Rohár
[not found] ` <201604052131.52765@pali>
2016-04-21 10:57 ` Pali Rohár
[not found] ` <20160421105724.GK29406@pali>
2016-04-21 13:12 ` Juergen Gross
[not found] ` <5718D1D4.3040309@suse.com>
2016-04-21 13:27 ` Pali Rohár
[not found] ` <20160421132735.GR29406@pali>
2016-05-09 14:37 ` Juergen Gross
[not found] ` <5730A08D.60100@suse.com>
2016-05-12 8:51 ` Pali Rohár
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