mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-22 21:32:06 +07:00
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
/*
|
|
* Common hypervisor code
|
|
*
|
|
* Copyright (C) 2008, VMware, Inc.
|
|
* Author : Alok N Kataria <akataria@vmware.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for more
|
|
* details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/export.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/hypervisor.h>
|
|
|
|
static const __initconst struct hypervisor_x86 * const hypervisors[] =
|
|
{
|
|
#ifdef CONFIG_XEN
|
|
&x86_hyper_xen,
|
|
#endif
|
|
&x86_hyper_vmware,
|
|
&x86_hyper_ms_hyperv,
|
|
#ifdef CONFIG_KVM_GUEST
|
|
&x86_hyper_kvm,
|
|
#endif
|
|
};
|
|
|
|
const struct hypervisor_x86 *x86_hyper;
|
|
EXPORT_SYMBOL(x86_hyper);
|
|
|
|
static inline void __init
|
|
detect_hypervisor_vendor(void)
|
|
{
|
|
const struct hypervisor_x86 *h, * const *p;
|
|
uint32_t pri, max_pri = 0;
|
|
|
|
for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
|
|
h = *p;
|
|
pri = h->detect();
|
|
if (pri != 0 && pri > max_pri) {
|
|
max_pri = pri;
|
|
x86_hyper = h;
|
|
}
|
|
}
|
|
|
|
if (max_pri)
|
|
pr_info("Hypervisor detected: %s\n", x86_hyper->name);
|
|
}
|
|
|
|
void init_hypervisor(struct cpuinfo_x86 *c)
|
|
{
|
|
if (x86_hyper && x86_hyper->set_cpu_features)
|
|
x86_hyper->set_cpu_features(c);
|
|
}
|
|
|
|
void __init init_hypervisor_platform(void)
|
|
{
|
|
|
|
detect_hypervisor_vendor();
|
|
|
|
if (!x86_hyper)
|
|
return;
|
|
|
|
init_hypervisor(&boot_cpu_data);
|
|
|
|
if (x86_hyper->init_platform)
|
|
x86_hyper->init_platform();
|
|
}
|
|
|
|
bool __init hypervisor_x2apic_available(void)
|
|
{
|
|
return x86_hyper &&
|
|
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");
|
|
}
|