4.4-stable review patch. If anyone has any objections, please let me know.
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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 Signed-off-by: Srivatsa S. Bhat srivatsa@csail.mit.edu Reviewed-by: Matt Helsley (VMware) matt.helsley@gmail.com Reviewed-by: Alexey Makhalov amakhalov@vmware.com Reviewed-by: Bo Gan ganb@vmware.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 @@ -460,6 +460,14 @@ 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); @@ -1587,6 +1595,7 @@ asmlinkage __visible void __init xen_sta
xen_init_irq_ops(); xen_init_cpuid_mask(); + xen_init_capabilities();
#ifdef CONFIG_X86_LOCAL_APIC /* @@ -1883,14 +1892,6 @@ 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); - } -} - const struct hypervisor_x86 x86_hyper_xen = { .name = "Xen", .detect = xen_platform, @@ -1898,7 +1899,6 @@ 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, }; EXPORT_SYMBOL(x86_hyper_xen);