Re: [PATCH 06/26] KVM: Drop CONFIG_KVM_VFIO and just look at KVM+VFIO
From: Alex Williamson <hidden>
Date: 2023-09-28 22:23:07
Also in:
kvm, kvm-riscv, kvmarm, linux-arm-kernel, linux-mips, linux-perf-users, linux-riscv, linux-s390, lkml
On Fri, 15 Sep 2023 17:30:58 -0700 Sean Christopherson [off-list ref] wrote:
Drop KVM's KVM_VFIO Kconfig, and instead compile in VFIO support if and only if VFIO itself is enabled. Similar to the recent change to have VFIO stop looking at HAVE_KVM, compiling in support for talking to VFIO just because the architecture supports VFIO is nonsensical. This fixes a bug where RISC-V doesn't select KVM_VFIO, i.e. would silently fail to do connect KVM and VFIO, even though RISC-V supports VFIO. The bug is benign as the only driver in all of Linux that actually uses the KVM reference provided by VFIO is KVM-GT, which is x86/Intel specific. Signed-off-by: Sean Christopherson <seanjc@google.com> --- arch/arm64/kvm/Kconfig | 1 - arch/powerpc/kvm/Kconfig | 1 - arch/s390/kvm/Kconfig | 1 - arch/x86/kvm/Kconfig | 1 - virt/kvm/Kconfig | 3 --- virt/kvm/Makefile.kvm | 4 +++- virt/kvm/vfio.h | 2 +- 7 files changed, 4 insertions(+), 9 deletions(-)
Reviewed-by: Alex Williamson <redacted>
quoted hunk ↗ jump to hunk
diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index 83c1e09be42e..2b5c332f157d 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig@@ -28,7 +28,6 @@ menuconfig KVM select KVM_MMIO select KVM_GENERIC_DIRTYLOG_READ_PROTECT select KVM_XFER_TO_GUEST_WORK - select KVM_VFIO select HAVE_KVM_EVENTFD select HAVE_KVM_IRQFD select HAVE_KVM_DIRTY_RING_ACQ_RELdiff --git a/arch/powerpc/kvm/Kconfig b/arch/powerpc/kvm/Kconfig index 902611954200..c4beb49c0eb2 100644 --- a/arch/powerpc/kvm/Kconfig +++ b/arch/powerpc/kvm/Kconfig@@ -22,7 +22,6 @@ config KVM select PREEMPT_NOTIFIERS select HAVE_KVM_EVENTFD select HAVE_KVM_VCPU_ASYNC_IOCTL - select KVM_VFIO select IRQ_BYPASS_MANAGER select HAVE_KVM_IRQ_BYPASS select INTERVAL_TREEdiff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig index 45fdf2a9b2e3..459d536116a6 100644 --- a/arch/s390/kvm/Kconfig +++ b/arch/s390/kvm/Kconfig@@ -31,7 +31,6 @@ config KVM select HAVE_KVM_IRQ_ROUTING select HAVE_KVM_INVALID_WAKEUPS select HAVE_KVM_NO_POLL - select KVM_VFIO select INTERVAL_TREE select MMU_NOTIFIER helpdiff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index ed90f148140d..0f01e5600b5f 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig@@ -45,7 +45,6 @@ config KVM select HAVE_KVM_NO_POLL 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_ENABLINGdiff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig index 484d0873061c..f0be3b55cea6 100644 --- a/virt/kvm/Kconfig +++ b/virt/kvm/Kconfig@@ -59,9 +59,6 @@ config HAVE_KVM_MSI config HAVE_KVM_CPU_RELAX_INTERCEPT bool -config KVM_VFIO - bool - config HAVE_KVM_INVALID_WAKEUPS booldiff --git a/virt/kvm/Makefile.kvm b/virt/kvm/Makefile.kvm index 2c27d5d0c367..29373b59d89a 100644 --- a/virt/kvm/Makefile.kvm +++ b/virt/kvm/Makefile.kvm@@ -6,7 +6,9 @@ KVM ?= ../../../virt/kvm kvm-y := $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/binary_stats.o -kvm-$(CONFIG_KVM_VFIO) += $(KVM)/vfio.o +ifdef CONFIG_VFIO +kvm-y += $(KVM)/vfio.o +endif kvm-$(CONFIG_KVM_MMIO) += $(KVM)/coalesced_mmio.o kvm-$(CONFIG_KVM_ASYNC_PF) += $(KVM)/async_pf.o kvm-$(CONFIG_HAVE_KVM_IRQ_ROUTING) += $(KVM)/irqchip.odiff --git a/virt/kvm/vfio.h b/virt/kvm/vfio.h index e130a4a03530..af475a323965 100644 --- a/virt/kvm/vfio.h +++ b/virt/kvm/vfio.h@@ -2,7 +2,7 @@ #ifndef __KVM_VFIO_H #define __KVM_VFIO_H -#ifdef CONFIG_KVM_VFIO +#if IS_ENABLED(CONFIG_KVM) && IS_ENABLED(CONFIG_VFIO) int kvm_vfio_ops_init(void); void kvm_vfio_ops_exit(void); #else