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 >
