On Tue, Oct 02, 2018 at 09:31:16PM +1000, Paul Mackerras wrote:
> This starts the process of adding the code to support nested HV-style
> virtualization. It defines a new H_SET_PARTITION_TABLE hypercall which
> a nested hypervisor can use to set the base address and size of a
> partition table in its memory (analogous to the PTCR register).
> On the host (level 0 hypervisor) side, the H_SET_PARTITION_TABLE
> hypercall from the guest is handled by code that saves the virtual
> PTCR value for the guest.
>
> This also adds code for creating and destroying nested guests and for
> reading the partition table entry for a nested guest from L1 memory.
> Each nested guest has its own shadow LPID value, different in general
> from the LPID value used by the nested hypervisor to refer to it. The
> shadow LPID value is allocated at nested guest creation time.
>
> Nested hypervisor functionality is only available for a radix guest,
> which therefore means a radix host on a POWER9 (or later) processor.
>
> Signed-off-by: Paul Mackerras <paulus@xxxxxxxxxx>
Reviewed-by: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
Couple of nits noted below
[snip]
> +void kvmhv_set_ptbl_entry(unsigned int lpid, u64 dw0, u64 dw1)
> +{
> + if (cpu_has_feature(CPU_FTR_HVMODE)) {
> + mmu_partition_table_set_entry(lpid, dw0, dw1);
> + } else {
> + pseries_partition_tb[lpid].patb0 = cpu_to_be64(dw0);
> + pseries_partition_tb[lpid].patb1 = cpu_to_be64(dw1);
> + /* this will be emulated, L0 will do the necessary barriers */
> + asm volatile(PPC_TLBIE_5(%0, %1, 2, 0, 1) : :
> + "r" (TLBIEL_INVAL_SET_LPID), "r" (lpid));
It seems a bit odd to me to introduce this with a mechanism we never
actually implement, then replace it. But I guess if refolding the
series is painful..
> + }
[snip]
> +/*
> + * Handle the H_SET_PARTITION_TABLE hcall.
> + * r4 = guest real address of partition table + log_2(size) - 12
> + * (formatted as for the PTCR).
> + */
> +long kvmhv_set_partition_table(struct kvm_vcpu *vcpu)
> +{
> + struct kvm *kvm = vcpu->kvm;
> + unsigned long ptcr = kvmppc_get_gpr(vcpu, 4);
> +
> + kvm->arch.l1_ptcr = ptcr;
Still no validation here.
> + return H_SUCCESS;
> +}
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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