forked from Minki/linux
47ae4b05d0
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>
100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
/*
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* Common hypervisor code
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*
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* Copyright (C) 2008, VMware, Inc.
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* Author : Alok N Kataria <akataria@vmware.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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*/
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#include <linux/init.h>
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#include <linux/export.h>
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#include <asm/processor.h>
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#include <asm/hypervisor.h>
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static const __initconst struct hypervisor_x86 * const hypervisors[] =
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{
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#ifdef CONFIG_XEN
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&x86_hyper_xen,
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#endif
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&x86_hyper_vmware,
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&x86_hyper_ms_hyperv,
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#ifdef CONFIG_KVM_GUEST
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&x86_hyper_kvm,
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#endif
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};
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const struct hypervisor_x86 *x86_hyper;
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EXPORT_SYMBOL(x86_hyper);
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static inline void __init
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detect_hypervisor_vendor(void)
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{
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const struct hypervisor_x86 *h, * const *p;
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uint32_t pri, max_pri = 0;
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for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
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h = *p;
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pri = h->detect();
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if (pri != 0 && pri > max_pri) {
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max_pri = pri;
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x86_hyper = h;
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}
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}
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if (max_pri)
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pr_info("Hypervisor detected: %s\n", x86_hyper->name);
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}
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void init_hypervisor(struct cpuinfo_x86 *c)
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{
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if (x86_hyper && x86_hyper->set_cpu_features)
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x86_hyper->set_cpu_features(c);
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}
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void __init init_hypervisor_platform(void)
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{
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detect_hypervisor_vendor();
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if (!x86_hyper)
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return;
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init_hypervisor(&boot_cpu_data);
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if (x86_hyper->init_platform)
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x86_hyper->init_platform();
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}
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bool __init hypervisor_x2apic_available(void)
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{
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return x86_hyper &&
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x86_hyper->x2apic_available &&
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x86_hyper->x2apic_available();
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}
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void hypervisor_pin_vcpu(int cpu)
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{
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if (!x86_hyper)
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return;
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if (x86_hyper->pin_vcpu)
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x86_hyper->pin_vcpu(cpu);
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else
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WARN_ONCE(1, "vcpu pinning requested but not supported!\n");
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}
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