[PATCH v6 28/33] KVM: s390: Add basic arm64 kvm module

[Janosch Frank]

On 8/12/26 5:36 PM, Steffen Eiden wrote:
> Add basic code for the new arm64 on s390 KVM implementation.
> Add kernel module boilerplate code and trivial functions.
> Add tracing scaffolding.
> 
> Signed-off-by: Steffen Eiden <seiden at linux.ibm.com>
> ---
>   arch/s390/kvm/arm64/arm.c   | 157 ++++++++++++++++++++++++++++++++++++
>   arch/s390/kvm/arm64/arm.h   |   7 ++
>   arch/s390/kvm/arm64/guest.c |  92 +++++++++++++++++++++
>   arch/s390/kvm/arm64/trace.h |  18 +++++
>   4 files changed, 274 insertions(+)
>   create mode 100644 arch/s390/kvm/arm64/arm.c
>   create mode 100644 arch/s390/kvm/arm64/arm.h
>   create mode 100644 arch/s390/kvm/arm64/guest.c
>   create mode 100644 arch/s390/kvm/arm64/trace.h
> 
> diff --git a/arch/s390/kvm/arm64/arm.c b/arch/s390/kvm/arm64/arm.c
> new file mode 100644
> index 000000000000..8e17b7eef813
> --- /dev/null
> +++ b/arch/s390/kvm/arm64/arm.c
> @@ -0,0 +1,157 @@

[...]

> +
> +static u64 kvm_max_guest_address(void)
> +{
> +	u64 max_addr;
> +
> +	if (sclp.hamax == U64_MAX)
> +		max_addr = TASK_SIZE_MAX;
> +	else
> +		max_addr = min_t(u64, TASK_SIZE_MAX, sclp.hamax);
> +	return ALIGN_DOWN(max_addr + 1, 1 << 30) - 1;
> +}
We're sure that the MSLA + 1 - MSOA > MGPAS check aka VIR code 4 will 
never bite us? Or will you touch this up with the qmc support?