[Xen-devel] [PATCH 2/3] xen: set cpu capabilities from xen_start_kernel()

[Juergen Gross <jgross@xxxxxxxx>]

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.

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

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
 arch/x86/xen/enlighten.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 2bea87cc0ff2..fb1867fedd29 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -471,6 +471,14 @@ static void __init xen_init_cpuid_mask(void)
                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);
@@ -1631,6 +1639,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
 
        xen_init_irq_ops();
        xen_init_cpuid_mask();
+       xen_init_capabilities();
 
 #ifdef CONFIG_X86_LOCAL_APIC
        /*
@@ -1975,14 +1984,6 @@ 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;
@@ -2029,7 +2030,6 @@ const struct hypervisor_x86 x86_hyper_xen = {
        .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);
-- 
2.13.6


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