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I=E2=80=99d really appreciate any thoughts or input. Thanks, Fahad On Fri, May 30, 2025 at 12:54=E2=80=AFPM Fahad Arslan wrote: > Hi, > > We=E2=80=99re attempting to use nested virtualization (NV2) on an Arm64 p= latform > with ARM=E2=80=99s Virtualization Extensions, using the Linux kernel 6.15= -rc7 and > Xen. In this setup, Xen is running as a level-1 (L1) guest hypervisor > inside a QEMU =E2=80=9Cvirt=E2=80=9D machine, which has been modified to = support KVM as the > host hypervisor (L0). > > The issue arises when Xen enables the MMU: its identity-mapped memory > region, including the address in TTBR0_EL2, becomes inaccessible. This > results in a translation fault when attempting to execute the next > instruction, halting further progress. > > Has anyone successfully run Xen as a guest under KVM on QEMU for Arm64 > with MMU and EL2 functioning correctly? > > Thanks, > Fahad > --000000000000f8965b0637610d24 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi,

Has anyone successfully run Xen as a guest= on KVM/QEMU for AArch64 with MMU and EL2 working?

I=E2=80=99d really appreciate any thoughts or input.

<= div>Thanks,
Fahad

On Fri, May 30, 2025= at 12:54=E2=80=AFPM Fahad Arslan <fahad.arslan@gmail.com> wrote:
Hi,

We=E2=80=99re attempting to use nested virtualization (NV2) on an A= rm64 platform with ARM=E2=80=99s Virtualization Extensions, using the Linux= kernel 6.15-rc7 and Xen. In this setup, Xen is running as a level-1 (L1) g= uest hypervisor inside a QEMU =E2=80=9Cvirt=E2=80=9D machine, which has bee= n modified to support KVM as the host hypervisor (L0).

The issue ari= ses when Xen enables the MMU: its identity-mapped memory region, including = the address in TTBR0_EL2, becomes inaccessible. This results in a translati= on fault when attempting to execute the next instruction, halting further p= rogress.

Has anyone successfully run Xen as a guest under KVM on QEM= U for Arm64 with MMU and EL2 functioning correctly?

Thanks,
Fahad
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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Am 12.06.2025 um 16:50 schrieb Fahad Arslan: > Hi, > > Has anyone successfully run Xen as a guest on KVM/QEMU for AArch64 with > MMU and EL2 working? Hi Fahad, sorry, I can't help here. The only thing that could potentially be interesting to you is that I am succesfully running Xen on a bare metal Raspberry Pi. Perhaps it is possible to run nested virtualization using Xen as the L0 hypervisor? But not knowing your objectives, my comment might also be totally off target. Paul > I’d really appreciate any thoughts or input. > > Thanks, > Fahad > > On Fri, May 30, 2025 at 12:54 PM Fahad Arslan > wrote: > > Hi, > > We’re attempting to use nested virtualization (NV2) on an Arm64 > platform with ARM’s Virtualization Extensions, using the Linux > kernel 6.15-rc7 and Xen. In this setup, Xen is running as a level-1 > (L1) guest hypervisor inside a QEMU “virt” machine, which has been > modified to support KVM as the host hypervisor (L0). > > The issue arises when Xen enables the MMU: its identity-mapped > memory region, including the address in TTBR0_EL2, becomes > inaccessible. This results in a translation fault when attempting to > execute the next instruction, halting further progress. > > Has anyone successfully run Xen as a guest under KVM on QEMU for > Arm64 with MMU and EL2 functioning correctly? > > Thanks, > Fahad >