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xen/pci: Defer initialization of MSI ops on HVM guests

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If the hardware supports APIC virtualization we may decide not to use
pirqs and instead use APIC/x2APIC directly, meaning that we don't want
to set x86_msi.setup_msi_irqs and x86_msi.teardown_msi_irq to
Xen-specific routines.  However, x2APIC is not set up by the time
pci_xen_hvm_init() is called so we need to postpone setting these ops
until later, when we know which APIC mode is used.

(Note that currently x2APIC is never initialized on HVM guests. This
may change in the future)

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Boris Ostrovsky 2014-12-02 15:19:12 -05:00 committed by David Vrabel
parent 6945c59c77
commit 066d79e4e2
1 changed files with 13 additions and 2 deletions
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15
arch/x86/pci/xen.c
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@ -431,6 +431,14 @@ int __init pci_xen_init(void)
return 0;
}
#ifdef CONFIG_PCI_MSI
void __init xen_msi_init(void)
{
x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
}
#endif
int __init pci_xen_hvm_init(void)
{
if (!xen_have_vector_callback || !xen_feature(XENFEAT_hvm_pirqs))
@ -445,8 +453,11 @@ int __init pci_xen_hvm_init(void)
#endif
#ifdef CONFIG_PCI_MSI
x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
/*
* We need to wait until after x2apic is initialized
* before we can set MSI IRQ ops.
*/
x86_platform.apic_post_init = xen_msi_init;
#endif
return 0;
}