Commit 93b71801 authored by Nicholas Piggin's avatar Nicholas Piggin Committed by Paolo Bonzini
Browse files

KVM: PPC: reserve capability 210 for KVM_CAP_PPC_AIL_MODE_3 



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: default avatarFabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: default avatarNicholas Piggin <npiggin@gmail.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 710c4765

Documentation/virt/kvm/api.rst

+14 −0
Original line number Diff line number Diff line
@@ -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.

======================

include/uapi/linux/kvm.h

+1 −0
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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

tools/include/uapi/linux/kvm.h

+1 −0
Original line number Diff line number Diff line
@@ -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