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KVM: PPC: reserve capability 210 for KVM_CAP_PPC_AIL_MODE_3

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Add KVM_CAP_PPC_AIL_MODE_3 to advertise the capability to set the AIL
resource mode to 3 with the H_SET_MODE hypercall. This capability
differs between processor types and KVM types (PR, HV, Nested HV), and
affects guest-visible behaviour.

QEMU will implement a cap-ail-mode-3 to control this behaviour[1], and
use the KVM CAP if available to determine KVM support[2].

Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nicholas Piggin 2022-02-22 09:06:54 -05:00 committed by Paolo Bonzini
parent 710c476514
commit 93b71801a8
3 changed files with 16 additions and 0 deletions
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14
Documentation/virt/kvm/api.rst
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@ -6997,6 +6997,20 @@ indicated by the fd to the VM this is called on.
This is intended to support intra-host migration of VMs between userspace VMMs,
upgrading the VMM process without interrupting the guest.
7.30 KVM_CAP_PPC_AIL_MODE_3
-------------------------------
:Capability: KVM_CAP_PPC_AIL_MODE_3
:Architectures: ppc
:Type: vm
This capability indicates that the kernel supports the mode 3 setting for the
"Address Translation Mode on Interrupt" aka "Alternate Interrupt Location"
resource that is controlled with the H_SET_MODE hypercall.
This capability allows a guest kernel to use a better-performance mode for
handling interrupts and system calls.
8. Other capabilities.
======================

1
include/uapi/linux/kvm.h
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@ -1134,6 +1134,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_VM_GPA_BITS 207
#define KVM_CAP_XSAVE2 208
#define KVM_CAP_SYS_ATTRIBUTES 209
#define KVM_CAP_PPC_AIL_MODE_3 210
#ifdef KVM_CAP_IRQ_ROUTING

1
tools/include/uapi/linux/kvm.h
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@ -1134,6 +1134,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_VM_GPA_BITS 207
#define KVM_CAP_XSAVE2 208
#define KVM_CAP_SYS_ATTRIBUTES 209
#define KVM_CAP_PPC_AIL_MODE_3 210
#ifdef KVM_CAP_IRQ_ROUTING