Re: [PATCH 12/12] hw/i386/mshv: drop initial msi vector 0

["Doru Blânzeanu" <dblanzeanu@linux.microsoft.com>]

On Fri, Jul 10, 2026 at 12:15:34PM +0200, Magnus Kulke wrote:
> This has been a warning before that was always raised if the machine has
> a hpet. hpet_reset() will eventually result in mshv_send_msi called w/
> vector 0, which we can safely drop.
> 
> Signed-off-by: Magnus Kulke <magnuskulke@linux.microsoft.com>
> ---
>  hw/i386/mshv/apic.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/hw/i386/mshv/apic.c b/hw/i386/mshv/apic.c
> index 9188a93b2f..ad326030bf 100644
> --- a/hw/i386/mshv/apic.c
> +++ b/hw/i386/mshv/apic.c
> @@ -293,6 +293,16 @@ static void mshv_send_msi(MSIMessage *msi)
>      delivery     = (data >> MSI_DATA_DELIVERY_MODE_SHIFT) &
>                     MSI_DATA_DELIVERY_MODE_MASK;
>  
> +    /*
> +     * Vector 0 is not a valid interrupt vector (0-15 are reserved for CPU
> +     * exceptions). This can trigger during machine reset, if hpet_reset()
> +     * forces the PIT to pulse GSI 2 before IOAPIC's own reset has masked its
> +     * redirection entries.
> +     */
> +    if (vector == 0) {
> +        return;
> +    }
> +
>      mshv_request_interrupt(mshv_state, delivery, vector, dest, dest_mode,
>                             trigger_mode);
>  }
> -- 
> 2.34.1

Reviewed-by: Doru Blânzeanu <dblanzeanu@linux.microsoft.com>