linux-kernel - [20/26] xen:pvhvm: enable PVHVM VCPU placement when using more than 32 CPUs.

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Date:	Fri, 18 Nov 2011 15:58:33 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Zhenzhong Duan <zhenzhong.duan@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [20/26] xen:pvhvm: enable PVHVM VCPU placement when using more than 32 CPUs.

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zhenzhong Duan <zhenzhong.duan@...cle.com>

commit 90d4f5534d14815bd94c10e8ceccc57287657ecc upstream.

PVHVM running with more than 32 vcpus and pv_irq/pv_time enabled
need VCPU placement to work, or else it will softlockup.

Acked-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...cle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/xen/enlighten.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1337,7 +1337,7 @@ static int __cpuinit xen_hvm_cpu_notify(
 	int cpu = (long)hcpu;
 	switch (action) {
 	case CPU_UP_PREPARE:
-		per_cpu(xen_vcpu, cpu) = &HYPERVISOR_shared_info->vcpu_info[cpu];
+		xen_vcpu_setup(cpu);
 		if (xen_have_vector_callback)
 			xen_init_lock_cpu(cpu);
 		break;
@@ -1367,7 +1367,6 @@ static void __init xen_hvm_guest_init(vo
 	xen_hvm_smp_init();
 	register_cpu_notifier(&xen_hvm_cpu_notifier);
 	xen_unplug_emulated_devices();
-	have_vcpu_info_placement = 0;
 	x86_init.irqs.intr_init = xen_init_IRQ;
 	xen_hvm_init_time_ops();
 	xen_hvm_init_mmu_ops();


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