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x86/xen: remove deprecated xen_nopvspin boot parameter

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The xen_nopvspin boot parameter is deprecated since 2019. nopvspin
can be used instead.

Remove the xen_nopvspin boot parameter and replace the xen_pvspin
variable use cases with nopvspin.

This requires to move the nopvspin variable out of the .initdata
section, as it needs to be accessed for cpuhotplug, too.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Message-ID: <20240710110139.22300-1-jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Juergen Gross 2024-07-10 13:01:39 +02:00
parent bcea31e2d1
commit 9fe6a8c5b2
3 changed files with 6 additions and 21 deletions
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5
Documentation/admin-guide/kernel-parameters.txt
View File

@ -7439,11 +7439,6 @@
access functions when running as Xen PV guest. The
default value is controlled by CONFIG_XEN_PV_MSR_SAFE.
xen_nopvspin [X86,XEN,EARLY]
Disables the qspinlock slowpath using Xen PV optimizations.
This parameter is obsoleted by "nopvspin" parameter, which
has equivalent effect for XEN platform.
xen_nopv [X86]
Disables the PV optimizations forcing the HVM guest to
run as generic HVM guest with no PV drivers.

20
arch/x86/xen/spinlock.c
View File

@ -18,7 +18,6 @@
static DEFINE_PER_CPU(int, lock_kicker_irq) = -1;
static DEFINE_PER_CPU(char *, irq_name);
static DEFINE_PER_CPU(atomic_t, xen_qlock_wait_nest);
static bool xen_pvspin = true;
static void xen_qlock_kick(int cpu)
{
@ -68,7 +67,7 @@ void xen_init_lock_cpu(int cpu)
int irq;
char *name;
if (!xen_pvspin)
if (nopvspin)
return;
WARN(per_cpu(lock_kicker_irq, cpu) >= 0, "spinlock on CPU%d exists on IRQ%d!\n",
@ -95,7 +94,7 @@ void xen_uninit_lock_cpu(int cpu)
{
int irq;
if (!xen_pvspin)
if (nopvspin)
return;
kfree(per_cpu(irq_name, cpu));
@ -125,10 +124,10 @@ PV_CALLEE_SAVE_REGS_THUNK(xen_vcpu_stolen);
void __init xen_init_spinlocks(void)
{
/* Don't need to use pvqspinlock code if there is only 1 vCPU. */
if (num_possible_cpus() == 1 || nopvspin)
xen_pvspin = false;
if (num_possible_cpus() == 1)
nopvspin = true;
if (!xen_pvspin) {
if (nopvspin) {
printk(KERN_DEBUG "xen: PV spinlocks disabled\n");
static_branch_disable(&virt_spin_lock_key);
return;
@ -143,12 +142,3 @@ void __init xen_init_spinlocks(void)
pv_ops.lock.kick = xen_qlock_kick;
pv_ops.lock.vcpu_is_preempted = PV_CALLEE_SAVE(xen_vcpu_stolen);
}
static __init int xen_parse_nopvspin(char *arg)
{
pr_notice("\"xen_nopvspin\" is deprecated, please use \"nopvspin\" instead\n");
xen_pvspin = false;
return 0;
}
early_param("xen_nopvspin", xen_parse_nopvspin);

2
kernel/locking/qspinlock.c
View File

@ -583,7 +583,7 @@ EXPORT_SYMBOL(queued_spin_lock_slowpath);
#include "qspinlock_paravirt.h"
#include "qspinlock.c"
bool nopvspin __initdata;
bool nopvspin;
static __init int parse_nopvspin(char *arg)
{
nopvspin = true;