[Xen-changelog] [xen stable-4.8] xen/arm: vgic: Make sure the number of SPIs is a multiple of 32

[patchbot@xxxxxxx]

commit e27fd5c0819b9289a7d1a4aeaaea8bd4e8e490af
Author:     Julien Grall <julien.grall@xxxxxxx>
AuthorDate: Fri Feb 16 14:59:56 2018 +0000
Commit:     Stefano Stabellini <sstabellini@xxxxxxxxxx>
CommitDate: Fri Mar 2 15:25:14 2018 -0800

    xen/arm: vgic: Make sure the number of SPIs is a multiple of 32
    
    The vGIC relies on having a pending_irq available for every IRQs
    described in the ranks. As each rank describes 32 interrupts, we need to
    make sure the number of SPIs is a multiple of 32.
    
    Reported-by: Jeff Kubascik <Jeff.Kubascik@xxxxxxxxxxxxxxx>
    Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
    Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
    Cc: Jarvis Roach <Jarvis.Roach@xxxxxxxxxxxxxxx>
    (cherry picked from commit 23b40df6f098e3bcb2f105a4909860240976e40f)
---
 xen/arch/arm/vgic.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/xen/arch/arm/vgic.c b/xen/arch/arm/vgic.c
index ce3830bb9e..60af06805d 100644
--- a/xen/arch/arm/vgic.c
+++ b/xen/arch/arm/vgic.c
@@ -118,6 +118,13 @@ int domain_vgic_init(struct domain *d, unsigned int 
nr_spis)
 
     d->arch.vgic.ctlr = 0;
 
+    /*
+     * The vGIC relies on having a pending_irq available for every IRQ
+     * described in the ranks. As each rank describes 32 interrupts, we
+     * need to make sure the number of SPIs is a multiple of 32.
+     */
+    nr_spis = ROUNDUP(nr_spis, 32);
+
     /* Limit the number of virtual SPIs supported to (1020 - 32) = 988  */
     if ( nr_spis > (1020 - NR_LOCAL_IRQS) )
         return -EINVAL;
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.8

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