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Re: [Qemu-arm] [Qemu-devel] [PATCH 2/6] arm v8M: Forcibly clear negative

From: Richard Henderson
Subject: Re: [Qemu-arm] [Qemu-devel] [PATCH 2/6] arm v8M: Forcibly clear negative-priority exceptions on deactivate
Date: Mon, 17 Jun 2019 12:39:46 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0

On 6/17/19 10:53 AM, Peter Maydell wrote:
> To prevent execution priority remaining negative if the guest
> returns from an NMI or HardFault with a corrupted IPSR, the
> v8M interrupt deactivation process forces the HardFault and NMI
> to inactive based on the current raw execution priority,
> even if the interrupt the guest is trying to deactivate
> is something else. In the pseudocode this is done in the
> Deactivate() function.
> Signed-off-by: Peter Maydell <address@hidden>
> ---
>  hw/intc/armv7m_nvic.c | 40 +++++++++++++++++++++++++++++++++++-----
>  1 file changed, 35 insertions(+), 5 deletions(-)

Reviewed-by: Richard Henderson <address@hidden>


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