[PATCH 4.9 16/61] xen: set cpu capabilities from xen_start_kernel()

Greg Kroah-Hartman
2018-06-05T17:06:46Z

From: Juergen Gross <jgross@suse.com>

Upstream commit: 0808e80cb760de2733c0527d2090ed2205a1eef8 ("xen: set
cpu capabilities from xen_start_kernel()")

There is no need to set the same capabilities for each cpu
individually. This can easily be done for all cpus when starting the
kernel.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/xen/enlighten.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)

--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -472,6 +472,14 @@ static void __init xen_init_cpuid_mask(v
cpuid_leaf1_ecx_set_mask = (1 << (X86_FEATURE_MWAIT % 32));
}

+static void __init xen_init_capabilities(void)
+{
+ if (xen_pv_domain()) {
+ setup_clear_cpu_cap(X86_BUG_SYSRET_SS_ATTRS);
+ setup_force_cpu_cap(X86_FEATURE_XENPV);
+ }
+}
+
static void xen_set_debugreg(int reg, unsigned long val)
{
HYPERVISOR_set_debugreg(reg, val);
@@ -1634,6 +1642,7 @@ asmlinkage __visible void __init xen_sta

xen_init_irq_ops();
xen_init_cpuid_mask();
+ xen_init_capabilities();

#ifdef CONFIG_X86_LOCAL_APIC
/*
@@ -1978,14 +1987,6 @@ bool xen_hvm_need_lapic(void)
}
EXPORT_SYMBOL_GPL(xen_hvm_need_lapic);

-static void xen_set_cpu_features(struct cpuinfo_x86 *c)
-{
- if (xen_pv_domain()) {
- clear_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
- set_cpu_cap(c, X86_FEATURE_XENPV);
- }
-}
-
static void xen_pin_vcpu(int cpu)
{
static bool disable_pinning;
@@ -2032,7 +2033,6 @@ const struct hypervisor_x86 x86_hyper_xe
.init_platform = xen_hvm_guest_init,
#endif
.x2apic_available = xen_x2apic_para_available,
- .set_cpu_features = xen_set_cpu_features,
.pin_vcpu = xen_pin_vcpu,
};
EXPORT_SYMBOL(x86_hyper_xen);