[PATCH v2 1/5] KVM: introduce CONFIG_KVM_COMMON

From: Paolo Bonzini
Date: Mon Jan 08 2024 - 07:52:38 EST

CONFIG_HAVE_KVM is currently used by some architectures to either
enabled the KVM config proper, or to enable host-side code that is
not part of the KVM module. However, CONFIG_KVM's "select" statement
in virt/kvm/Kconfig corresponds to a third meaning, namely to
enable common Kconfigs required by all architectures that support
KVM.

These three meanings can be replaced respectively by an
architecture-specific Kconfig, by IS_ENABLED(CONFIG_KVM), or by
a new Kconfig symbol that is in turn selected by the
architecture-specific "config KVM".

Start by introducing such a new Kconfig symbol, CONFIG_KVM_COMMON.
Unlike CONFIG_HAVE_KVM, it is selected by CONFIG_KVM, not by
architecture code, and it brings in all dependencies of common
KVM code. In particular, INTERVAL_TREE was missing in loongarch
and riscv, so that is another thing that is fixed.

Fixes: 8132d887a702 ("KVM: remove CONFIG_HAVE_KVM_EVENTFD", 2023-12-08)
Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Closes: https://lore.kernel.org/all/44907c6b-c5bd-4e4a-a921-e4d3825539d8@xxxxxxxxxxxxx/
Cc: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
arch/arm64/kvm/Kconfig | 3 +--
arch/loongarch/kvm/Kconfig | 2 +-
arch/mips/kvm/Kconfig | 3 +--
arch/powerpc/kvm/Kconfig | 3 +--
arch/riscv/kvm/Kconfig | 2 +-
arch/s390/kvm/Kconfig | 3 +--
arch/x86/kvm/Kconfig | 3 +--
virt/kvm/Kconfig | 5 +++++
8 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index b07c60c9737d..6c3c8ca73e7f 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -21,9 +21,9 @@ if VIRTUALIZATION
menuconfig KVM
bool "Kernel-based Virtual Machine (KVM) support"
depends on HAVE_KVM
+ select KVM_COMMON
select KVM_GENERIC_HARDWARE_ENABLING
select KVM_GENERIC_MMU_NOTIFIER
- select PREEMPT_NOTIFIERS
select HAVE_KVM_CPU_RELAX_INTERCEPT
select KVM_MMIO
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
@@ -39,7 +39,6 @@ menuconfig KVM
select HAVE_KVM_VCPU_RUN_PID_CHANGE
select SCHED_INFO
select GUEST_PERF_EVENTS if PERF_EVENTS
- select INTERVAL_TREE
select XARRAY_MULTI
help
Support hosting virtualized guest machines.
diff --git a/arch/loongarch/kvm/Kconfig b/arch/loongarch/kvm/Kconfig
index daba4cd5e87d..61f7e33b1f95 100644
--- a/arch/loongarch/kvm/Kconfig
+++ b/arch/loongarch/kvm/Kconfig
@@ -23,12 +23,12 @@ config KVM
depends on HAVE_KVM
select HAVE_KVM_DIRTY_RING_ACQ_REL
select HAVE_KVM_VCPU_ASYNC_IOCTL
+ select KVM_COMMON
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select KVM_GENERIC_HARDWARE_ENABLING
select KVM_GENERIC_MMU_NOTIFIER
select KVM_MMIO
select KVM_XFER_TO_GUEST_WORK
- select PREEMPT_NOTIFIERS
help
Support hosting virtualized guest machines using
hardware virtualization extensions. You will need
diff --git a/arch/mips/kvm/Kconfig b/arch/mips/kvm/Kconfig
index 428141b0b48f..18e7a17d5115 100644
--- a/arch/mips/kvm/Kconfig
+++ b/arch/mips/kvm/Kconfig
@@ -20,12 +20,11 @@ config KVM
depends on HAVE_KVM
depends on MIPS_FP_SUPPORT
select EXPORT_UASM
- select PREEMPT_NOTIFIERS
+ select KVM_COMMON
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select HAVE_KVM_VCPU_ASYNC_IOCTL
select KVM_MMIO
select KVM_GENERIC_MMU_NOTIFIER
- select INTERVAL_TREE
select KVM_GENERIC_HARDWARE_ENABLING
help
Support for hosting Guest kernels.
diff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig
index b47196085a42..074263429faf 100644
--- a/arch/powerpc/kvm/Kconfig
+++ b/arch/powerpc/kvm/Kconfig
@@ -19,12 +19,11 @@ if VIRTUALIZATION

config KVM
bool
- select PREEMPT_NOTIFIERS
+ select KVM_COMMON
select HAVE_KVM_VCPU_ASYNC_IOCTL
select KVM_VFIO
select IRQ_BYPASS_MANAGER
select HAVE_KVM_IRQ_BYPASS
- select INTERVAL_TREE

config KVM_BOOK3S_HANDLER
bool
diff --git a/arch/riscv/kvm/Kconfig b/arch/riscv/kvm/Kconfig
index 1fd76aee3b71..d490db943858 100644
--- a/arch/riscv/kvm/Kconfig
+++ b/arch/riscv/kvm/Kconfig
@@ -24,12 +24,12 @@ config KVM
select HAVE_KVM_IRQ_ROUTING
select HAVE_KVM_MSI
select HAVE_KVM_VCPU_ASYNC_IOCTL
+ select KVM_COMMON
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select KVM_GENERIC_HARDWARE_ENABLING
select KVM_MMIO
select KVM_XFER_TO_GUEST_WORK
select KVM_GENERIC_MMU_NOTIFIER
- select PREEMPT_NOTIFIERS
select SCHED_INFO
help
Support hosting virtualized guest machines.
diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
index bb6d90351119..72e9b7dcdf7d 100644
--- a/arch/s390/kvm/Kconfig
+++ b/arch/s390/kvm/Kconfig
@@ -20,17 +20,16 @@ config KVM
def_tristate y
prompt "Kernel-based Virtual Machine (KVM) support"
depends on HAVE_KVM
- select PREEMPT_NOTIFIERS
select HAVE_KVM_CPU_RELAX_INTERCEPT
select HAVE_KVM_VCPU_ASYNC_IOCTL
select KVM_ASYNC_PF
select KVM_ASYNC_PF_SYNC
+ select KVM_COMMON
select HAVE_KVM_IRQCHIP
select HAVE_KVM_IRQ_ROUTING
select HAVE_KVM_INVALID_WAKEUPS
select HAVE_KVM_NO_POLL
select KVM_VFIO
- select INTERVAL_TREE
select MMU_NOTIFIER
help
Support hosting paravirtualized guest machines using the SIE
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index b07247b0b958..cce3dea27920 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -23,7 +23,7 @@ config KVM
depends on HAVE_KVM
depends on HIGH_RES_TIMERS
depends on X86_LOCAL_APIC
- select PREEMPT_NOTIFIERS
+ select KVM_COMMON
select KVM_GENERIC_MMU_NOTIFIER
select HAVE_KVM_IRQCHIP
select HAVE_KVM_PFNCACHE
@@ -44,7 +44,6 @@ config KVM
select KVM_XFER_TO_GUEST_WORK
select KVM_GENERIC_DIRTYLOG_READ_PROTECT
select KVM_VFIO
- select INTERVAL_TREE
select HAVE_KVM_PM_NOTIFIER if PM
select KVM_GENERIC_HARDWARE_ENABLING
help
diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index 6793211a0b64..ace72be98fb2 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -3,7 +3,12 @@

config HAVE_KVM
bool
+
+config KVM_COMMON
+ bool
select EVENTFD
+ select INTERVAL_TREE
+ select PREEMPT_NOTIFIERS

config HAVE_KVM_PFNCACHE
bool
--
2.39.1