From: Paul Mackerras <paulus@ozlabs.org>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: linuxppc-dev@ozlabs.org, kvm-ppc@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH v3 33/33] KVM: PPC: Book3S HV: Add a VM capability to enable nested virtualization
Date: Thu, 4 Oct 2018 19:48:26 +1000 [thread overview]
Message-ID: <20181004094826.GC3255@fergus> (raw)
In-Reply-To: <20181003062144.GY1886@umbus.fritz.box>
On Wed, Oct 03, 2018 at 04:21:44PM +1000, David Gibson wrote:
> On Tue, Oct 02, 2018 at 09:31:32PM +1000, Paul Mackerras wrote:
> > With this, userspace can enable a KVM-HV guest to run nested guests
> > under it.
[snip]
> > +/* If set, guests are allowed to create and control nested guests */
> > +static bool enable_nested = true;
> > +module_param(enable_nested, bool, S_IRUGO | S_IWUSR);
> > +MODULE_PARM_DESC(enable_nested, "Enable nested virtualization (only on POWER9)");
>
> I'd suggest calling the module parameter just "nested" to match x86.
OK.
> > /* If set, the threads on each CPU core have to be in the same MMU mode */
> > static bool no_mixing_hpt_and_radix;
> >
> > @@ -5188,6 +5193,17 @@ static int kvmhv_configure_mmu(struct kvm *kvm, struct kvm_ppc_mmuv3_cfg *cfg)
> > return err;
> > }
> >
> > +static int kvmhv_enable_nested(struct kvm *kvm, bool enable)
> > +{
> > + if (!(enable_nested && cpu_has_feature(CPU_FTR_ARCH_300)))
> > + return -EINVAL;
>
> Maybe EPERM, rather than EINVAL. There's nothing invalid about the
> ioctl() parameters - we just can't do what they want.
Just for pedantry's sake, I'll make it EPERM for !enable_nested and
ENODEV for !POWER9. :)
Paul.
next prev parent reply other threads:[~2018-10-04 9:51 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-02 11:30 [PATCH v3 00/33] KVM: PPC: Book3S HV: Nested HV virtualization Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 01/33] powerpc: Turn off CPU_FTR_P9_TM_HV_ASSIST in non-hypervisor mode Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 02/33] KVM: PPC: Book3S: Simplify external interrupt handling Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 03/33] KVM: PPC: Book3S HV: Remove left-over code in XICS-on-XIVE emulation Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 04/33] KVM: PPC: Book3S HV: Move interrupt delivery on guest entry to C code Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 05/33] KVM: PPC: Book3S HV: Extract PMU save/restore operations as C-callable functions Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 06/33] KVM: PPC: Book3S HV: Simplify real-mode interrupt handling Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 07/33] KVM: PPC: Book3S: Rework TM save/restore code and make it C-callable Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 08/33] KVM: PPC: Book3S HV: Call kvmppc_handle_exit_hv() with vcore unlocked Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 09/33] KVM: PPC: Book3S HV: Streamlined guest entry/exit path on P9 for radix guests Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 10/33] KVM: PPC: Book3S HV: Handle hypervisor instruction faults better Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 11/33] KVM: PPC: Book3S HV: Add a debugfs file to dump radix mappings Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 12/33] KVM: PPC: Use ccr field in pt_regs struct embedded in vcpu struct Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 13/33] KVM: PPC: Book3S HV: Clear partition table entry on vm teardown Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 14/33] KVM: PPC: Book3S HV: Make kvmppc_mmu_radix_xlate process/partition table agnostic Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 15/33] KVM: PPC: Book3S HV: Refactor radix page fault handler Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 16/33] KVM: PPC: Book3S HV: Use kvmppc_unmap_pte() in kvm_unmap_radix() Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 17/33] KVM: PPC: Book3S HV: Framework and hcall stubs for nested virtualization Paul Mackerras
2018-10-03 3:17 ` David Gibson
2018-10-02 11:31 ` [PATCH v3 18/33] KVM: PPC: Book3S HV: Nested guest entry via hypercall Paul Mackerras
2018-10-03 5:12 ` David Gibson
2018-10-02 11:31 ` [PATCH v3 19/33] KVM: PPC: Book3S HV: Use XICS hypercalls when running as a nested hypervisor Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 20/33] KVM: PPC: Book3S HV: Handle hypercalls correctly when nested Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 21/33] KVM: PPC: Book3S HV: Framework to handle HV Emulation Assist Interrupt Paul Mackerras
2018-10-03 5:13 ` David Gibson
2018-10-02 11:31 ` [PATCH v3 22/33] KVM: PPC: Book3S HV: Handle page fault for a nested guest Paul Mackerras
2018-10-03 5:39 ` David Gibson
2018-10-03 5:42 ` David Gibson
2018-10-04 9:21 ` Paul Mackerras
2018-10-05 2:46 ` David Gibson
2018-10-02 11:31 ` [PATCH v3 23/33] KVM: PPC: Book3S HV: Introduce rmap to track nested guest mappings Paul Mackerras
2018-10-03 5:56 ` David Gibson
2018-10-04 3:05 ` Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 24/33] KVM: PPC: Book3S HV: Emulate Privileged TLBIE for guest hypervisors Paul Mackerras
2018-10-03 5:56 ` David Gibson
2018-10-02 11:31 ` [PATCH v3 25/33] KVM: PPC: Book3S HV: Invalidate TLB when nested vcpu moves physical cpu Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 26/33] KVM: PPC: Book3S HV: Don't access HFSCR, LPIDR or LPCR when running nested Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 27/33] KVM: PPC: Book3S HV: Add one-reg interface to virtual PTCR register Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 28/33] KVM: PPC: Book3S HV: Sanitise hv_regs on nested guest entry Paul Mackerras
2018-10-03 6:07 ` David Gibson
2018-10-02 11:31 ` [PATCH v3 29/33] KVM: PPC: Book3S HV: Handle differing endianness for H_ENTER_NESTED Paul Mackerras
2018-10-03 6:13 ` David Gibson
2018-10-04 9:29 ` Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 30/33] KVM: PPC: Book3S HV: Allow HV module to load without hypervisor mode Paul Mackerras
2018-10-03 6:15 ` David Gibson
2018-10-04 3:03 ` Paul Mackerras
2018-10-05 3:05 ` David Gibson
2018-10-02 11:31 ` [PATCH v3 31/33] KVM: PPC: Book3S HV: Add nested shadow page tables to debugfs Paul Mackerras
2018-10-02 11:31 ` [PATCH v3 32/33] KVM: PPC: Book3S HV: Use hypercalls for TLB invalidation when nested Paul Mackerras
2018-10-03 6:17 ` David Gibson
2018-10-02 11:31 ` [PATCH v3 33/33] KVM: PPC: Book3S HV: Add a VM capability to enable nested virtualization Paul Mackerras
2018-10-03 6:21 ` David Gibson
2018-10-04 9:48 ` Paul Mackerras [this message]
2018-10-05 3:29 ` David Gibson
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