• Marc Zyngier's avatar
    arm64: KVM: Warn when PARange is less than 40 bits · 6141570c
    Marc Zyngier authored
    We always thought that 40bits of PA range would be the minimum people
    would actually build. Anything less is terrifyingly small.
    
    Turns out that we were both right and wrong. Nobody has ever built
    such a system, but the ARM Foundation Model has a PARange set to 36bits.
    Just because we can. Oh well. Now, the KVM API explicitely says that
    we offer a 40bit PA space to the VM, so we shouldn't run KVM on
    the Foundation Model at all.
    
    That being said, this patch offers a less agressive alternative, and
    loudly warns about the configuration being unsupported. You'll still
    be able to run VMs (at your own risks, though).
    
    This is just a workaround until we have a proper userspace API where
    we report the PARange to userspace.
    Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
    Signed-off-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
    6141570c
kvm_arm.h 7.28 KB