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Re: [Qemu-devel] [PATCH v3 0/4] target-ppc: Add FWNMI support in qemu fo
From: |
Aravinda Prasad |
Subject: |
Re: [Qemu-devel] [PATCH v3 0/4] target-ppc: Add FWNMI support in qemu for powerKVM guests |
Date: |
Wed, 19 Nov 2014 11:18:58 +0530 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130510 Thunderbird/17.0.6 |
On Tuesday 11 November 2014 08:54 AM, David Gibson wrote:
[..]
>
> So, this may not still be possible depending on whether the KVM side
> of this is already merged, but it occurs to me that there's a simpler
> way.
>
> Rather than mucking about with having to update the hypervisor on the
> RTAS location, they have qemu copy the code out of RTAS, patch it and
> copy it back into the vector, you could instead do this:
>
> 1. Make KVM instead of immediately delivering a 0x200 for a guest
> machine check, cause a special exit to qemu.
>
> 2. Have the register-nmi RTAS call store the guest side MC handler
> address in the spapr structure, but perform no actual guest code
> patching.
>
> 3. Allocate the error log buffer independently from the RTAS blob,
> so qemu always knows where it is.
>
> 4. When qemu gets the MC exit condition, instead of going via a
> patched 0x200 vector, just directly set the guest register state and
> jump straight into the guest side MC handler.
>
Before I proceed further I would like to know what others think about
the approach proposed above (except for step 3 - as per PAPR the error
log buffer should be part of RTAS blob and hence we cannot have error
log buffer independent of RTAS blob).
Alex, Alexey, Ben: Any thoughts?
--
Regards,
Aravinda
- Re: [Qemu-devel] [PATCH v3 4/4] target-ppc: Handle ibm, nmi-register RTAS call, (continued)
- Re: [Qemu-devel] [PATCH v3 4/4] target-ppc: Handle ibm, nmi-register RTAS call, David Gibson, 2014/11/13
- Re: [Qemu-devel] [PATCH v3 4/4] target-ppc: Handle ibm, nmi-register RTAS call, Aravinda Prasad, 2014/11/13
- Re: [Qemu-devel] [PATCH v3 4/4] target-ppc: Handle ibm, nmi-register RTAS call, David Gibson, 2014/11/13
- Re: [Qemu-devel] [PATCH v3 4/4] target-ppc: Handle ibm, nmi-register RTAS call, Aravinda Prasad, 2014/11/13
- Re: [Qemu-devel] [PATCH v3 4/4] target-ppc: Handle ibm, nmi-register RTAS call, David Gibson, 2014/11/13
- Re: [Qemu-devel] [PATCH v3 4/4] target-ppc: Handle ibm, nmi-register RTAS call, Aravinda Prasad, 2014/11/14
Re: [Qemu-devel] [PATCH v3 0/4] target-ppc: Add FWNMI support in qemu for powerKVM guests, David Gibson, 2014/11/10
Re: [Qemu-devel] [PATCH v3 0/4] target-ppc: Add FWNMI support in qemu for powerKVM guests,
Aravinda Prasad <=
- Re: [Qemu-devel] [PATCH v3 0/4] target-ppc: Add FWNMI support in qemu for powerKVM guests, Alexander Graf, 2014/11/19
- Re: [Qemu-devel] [PATCH v3 0/4] target-ppc: Add FWNMI support in qemu for powerKVM guests, David Gibson, 2014/11/19
- Re: [Qemu-devel] [PATCH v3 0/4] target-ppc: Add FWNMI support in qemu for powerKVM guests, Alexander Graf, 2014/11/19
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 0/4] target-ppc: Add FWNMI support in qemu for powerKVM guests, Alexander Graf, 2014/11/19
- Re: [Qemu-devel] [PATCH v3 0/4] target-ppc: Add FWNMI support in qemu for powerKVM guests, David Gibson, 2014/11/19