From: "Philippe Mathieu-Daudé" <philmd@redhat.com>
To: Wayne Li <waynli329@gmail.com>,
David Gibson <david@gibson.dropbear.id.au>,
qemu-ppc <qemu-ppc@nongnu.org>
Cc: QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: Program counter stuck at 0xFFFFFFFC when emulating e5500 processor on T4240-RDB board
Date: Thu, 20 Feb 2020 09:44:13 +0100 [thread overview]
Message-ID: <838be9cf-2d3c-f807-7f1d-6a50f95a5228@redhat.com> (raw)
In-Reply-To: <CAM2K0npCdHfCeMCKO9TX_ifQGDZFFNyMEKH2qByYL9SnXnaPmw@mail.gmail.com>
Hello,
On 2/20/20 6:40 AM, Wayne Li wrote:
> Dear QEMU list members,
No subject: it is unlikely your question get noticed...
Also you didn't Cc'ed the people who might help you (doing that for you):
./scripts/get_maintainer.pl -f target/ppc/cpu-models.c
David Gibson <david@gibson.dropbear.id.au> (maintainer:PowerPC TCG CPUs)
qemu-ppc@nongnu.org (open list:PowerPC TCG CPUs)
qemu-devel@nongnu.org (open list:All patches CC here)
> This will kind of be a repost but I'd like to post my question again
> because I've gained some more knowledge that makes me feel that my
> question would be easier to answer. So we developed a custom-made QEMU
> VM that emulates a custom machine that has an e5500 processor. I'm
> running this VM on a T4240-RDB board which has an e6500 processor and
> I'm trying to get the VM running with KVM enabled. The problem I'm
> having is the program counter refuses to increment at all. It just
> stays at the address 0xFFFFFFFC. On a run without KVM enabled, the VM
> will also start executing at this same address but the program counter
> beings to increment immediately. I know this is a custom QEMU VM and
> maybe some of the startup stuff we do could be causing problems, but
> what could possibly stop the program counter from incrementing altogether?
>
> Also, I do have another side question. When running with KVM enabled, I
> see the kernel-level ioctl call KVM_RUN running and then returning over
> and over again (by the way before the VM kinda grinds to a halt I only
> see QEMU make the KVM_RUN call twice, but the kernel-level ioctl
> function is being called over and over again for some reason). And each
> time the KVM_RUN call returns, the return-from-interrupt takes the VM to
> the address 0xFFFFFFFC. What is the KVM_RUN ioctl call used for? Why
> is it being called over and over again? Maybe if I understood this
> better I'd be able to figure out what's stopping my program counter from
> incrementing.
>
> -Thanks, Wayne Li
next prev parent reply other threads:[~2020-02-20 8:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-20 5:40 Wayne Li
2020-02-20 8:44 ` Philippe Mathieu-Daudé [this message]
2020-03-11 5:03 ` Program counter stuck at 0xFFFFFFFC when emulating e5500 processor on T4240-RDB board David Gibson
2020-02-20 9:57 ` Peter Maydell
2020-02-20 16:52 ` Re: Wayne Li
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