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Re: [Qemu-arm] [PATCH 0/3] target/arm: Support EL1 AArch32 guest under A
From: |
Edgar E. Iglesias |
Subject: |
Re: [Qemu-arm] [PATCH 0/3] target/arm: Support EL1 AArch32 guest under AArch64 EL2 |
Date: |
Thu, 12 Jan 2017 21:46:14 +0100 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Tue, Jan 10, 2017 at 06:44:06PM +0000, Peter Maydell wrote:
> The GICv3 virt patchset is sufficient to run a 64-bit guest under
> a 64-bit host kernel. To run 32-bit guests under the 64-bit host
> you need a few more things:
> * data aborts from AArch32 need to provide instruction syndrome info
> to the hypervisor
> * the AArch32 interrupt code needs to handle VIRQ and VFIQ
> * we need a DBGVCR32_EL2 register, because Linux's EL2 code uses
> it to context-switch AArch32 DBGVCR between guests
>
> This patchset sits on top of the gicv3-virt patchset and is
> sufficient to run a Linux 32-bit guest under 64-bit Linux host.
Cool stuff Peter, I didn't think we were this close for this to work!
32bit hypervisors would be cool too but I'm guessing there's quite a bit
of work before that works...
Cheers,
Edgar
>
> Git branch with the whole lot:
> https://git.linaro.org/people/peter.maydell/qemu-arm.git aarch32-guest
>
>
> Peter Maydell (3):
> target/arm: A32, T32: Create Instruction Syndromes for Data Aborts
> target/arm: Handle VIRQ and VFIQ in arm_cpu_do_interrupt_aarch32()
> target/arm: Implement DBGVCR32_EL2 system register
>
> target/arm/helper.c | 21 +++++
> target/arm/translate.c | 213
> ++++++++++++++++++++++++++++++++++++-------------
> 2 files changed, 178 insertions(+), 56 deletions(-)
>
> --
> 2.7.4
>