On Mon, Mar 18, 2013 at 08:47:19PM +0800, Yang Zhang wrote:
> From: Yang Zhang <[email protected]>
>
> Update destination vcpu map when ioapic entry or apic(id, ldr, dfr) is changed
>
> Signed-off-by: Yang Zhang <[email protected]>
> ---
> virt/kvm/ioapic.c | 40 ++++++++++++++++++++++++++++++++++++++--
> 1 files changed, 38 insertions(+), 2 deletions(-)
>
> diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c
> index 4296116..329efe1 100644
> --- a/virt/kvm/ioapic.c
> +++ b/virt/kvm/ioapic.c
> @@ -87,6 +87,38 @@ static unsigned long ioapic_read_indirect(struct
> kvm_ioapic *ioapic,
> return result;
> }
>
> +#ifdef CONFIG_X86
> +static void rtc_irq_get_dest_vcpu(struct kvm_ioapic *ioapic, int irq)
> +{
> + union kvm_ioapic_redirect_entry *entry = &ioapic->redirtbl[irq];
> + struct kvm_lapic_irq irqe;
> +
> + if (irq != 8 || entry->fields.mask)
> + return;
> +
> + spin_lock(&ioapic->lock);
How does this not deadlock? The is called from kvm_scan_ioapic_entry()
and kvm_scan_ioapic_entry() is called from ioapic_write_indirect() with
the lock already taken. You should handle that the same way we handle
eoibitmap recalculation: signal vcpu and calculate there.
> + irqe.dest_id = entry->fields.dest_id;
> + irqe.vector = entry->fields.vector;
> + irqe.dest_mode = entry->fields.dest_mode;
> + irqe.trig_mode = entry->fields.trig_mode;
> + irqe.delivery_mode = entry->fields.delivery_mode << 8;
> + irqe.level = 1;
> + irqe.shorthand = 0;
> +
> + bitmap_zero(ioapic->rtc_status.vcpu_map, KVM_MAX_VCPUS);
> +
> + kvm_get_dest_vcpu(ioapic->kvm, &irqe, ioapic->rtc_status.vcpu_map);
> + spin_unlock(&ioapic->lock);
> +}
> +
> +#else
> +
> +static void rtc_irq_get_dest_vcpu(struct kvm_ioapic *ioapic, int irq)
> +{
> + return;
> +}
> +#endif
> +
> static int ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx)
> {
> union kvm_ioapic_redirect_entry *pent;
> @@ -147,9 +179,13 @@ void kvm_scan_ioapic_entry(struct kvm *kvm)
> {
> struct kvm_ioapic *ioapic = kvm->arch.vioapic;
>
> - if (!kvm_apic_vid_enabled(kvm) || !ioapic)
> + if (!ioapic)
> return;
> - kvm_make_update_eoibitmap_request(kvm);
> +
> + rtc_irq_get_dest_vcpu(ioapic, 8);
> +
> + if (kvm_apic_vid_enabled(kvm))
> + kvm_make_update_eoibitmap_request(kvm);
> }
>
> static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val)
> --
> 1.7.1
--
Gleb.
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