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KVM: x86: Zero the IOAPIC scan request dest vCPUs bitmap

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Not zeroing the bitmap used for identifying the destination vCPUs for an
IOAPIC scan request in fixed delivery mode could lead to waking up unwanted
vCPUs. This patch zeroes the vCPU bitmap before passing it to
kvm_bitmap_or_dest_vcpus(), which is responsible for setting the bitmap
with the bits corresponding to the destination vCPUs.

Fixes: 7ee30bc132c6("KVM: x86: deliver KVM IOAPIC scan request to target vCPUs")
Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nitesh Narayan Lal 2019-11-20 07:12:24 -05:00 committed by Paolo Bonzini
parent fe289ebb65
commit 9a2ae9f6b6
1 changed files with 1 additions and 0 deletions
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arch/x86/kvm/ioapic.c
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@ -332,6 +332,7 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
irq.delivery_mode = e->fields.delivery_mode << 8;
irq.dest_id = e->fields.dest_id;
irq.dest_mode = e->fields.dest_mode;
bitmap_zero(&vcpu_bitmap, 16);
kvm_bitmap_or_dest_vcpus(ioapic->kvm, &irq,
&vcpu_bitmap);
if (old_dest_mode != e->fields.dest_mode ||