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Commit ee42d665 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by David Vrabel
Browse files

xen/pvhvm: run xen_vcpu_setup() for the boot CPU 



Historically we didn't call VCPUOP_register_vcpu_info for CPU0 for
PVHVM guests (while we had it for PV and ARM guests). This is usually
fine as we can use vcpu info in the shared_info page but when we try
booting on a vCPU with Xen's vCPU id > 31 (e.g. when we try to kdump
after crashing on this CPU) we're not able to boot.

Switch to always doing VCPUOP_register_vcpu_info for the boot CPU.

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
parent cbbb4682

arch/x86/xen/enlighten.c

+1 −1
Original line number Diff line number Diff line
@@ -184,7 +184,7 @@ static void clamp_max_cpus(void) 
#endif

}



static void xen_vcpu_setup(int cpu)

void xen_vcpu_setup(int cpu)

{

	struct vcpu_register_vcpu_info info;

	int err;

arch/x86/xen/smp.c

+7 −0
Original line number Diff line number Diff line
@@ -322,6 +322,13 @@ static void __init xen_smp_prepare_boot_cpu(void) 
		xen_filter_cpu_maps();

		xen_setup_vcpu_info_placement();

	}



	/*

	 * Setup vcpu_info for boot CPU.

	 */

	if (xen_hvm_domain())

		xen_vcpu_setup(0);



	/*

	 * The alternative logic (which patches the unlock/lock) runs before

	 * the smp bootup up code is activated. Hence we need to set this up

arch/x86/xen/xen-ops.h

+1 −0
Original line number Diff line number Diff line
@@ -76,6 +76,7 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id); 


bool xen_vcpu_stolen(int vcpu);



void xen_vcpu_setup(int cpu);

void xen_setup_vcpu_info_placement(void);



#ifdef CONFIG_SMP