[PATCH kernel v2] KVM: PPC: Make KVM_CAP_IRQFD_RESAMPLE support platform dependent
From: Alexey Kardashevskiy <hidden>
Date: 2022-09-20 12:53:16
Also in:
kvm, kvm-riscv, kvmarm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine (kvm), kernel virtual machine for arm64 (kvm/arm64), kernel virtual machine for mips (kvm/mips), kernel virtual machine for powerpc (kvm/powerpc), kernel virtual machine for risc-v (kvm/riscv), kernel virtual machine for x86 (kvm/x86), kernel virtual machine for s390 (kvm/s390), linux for powerpc (32-bit and 64-bit), mips, risc-v architecture, s390 architecture, the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Catalin Marinas, Will Deacon, Paolo Bonzini, Marc Zyngier, Oliver Upton, Huacai Chen, Madhavan Srinivasan, Anup Patel, Sean Christopherson, Christian Borntraeger, Janosch Frank, Claudio Imbrenda, Michael Ellerman, Thomas Bogendoerfer, Paul Walmsley, Palmer Dabbelt, Albert Ou, Heiko Carstens, Vasily Gorbik, Alexander Gordeev, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
When introduced, IRQFD resampling worked on POWER8 with XICS. However
KVM on POWER9 has never implemented it - the compatibility mode code
("XICS-on-XIVE") misses the kvm_notify_acked_irq() call and the native
XIVE mode does not handle INTx in KVM at all.
This moved the capability support advertising to platforms and stops
advertising it on XIVE, i.e. POWER9 and later.
Signed-off-by: Alexey Kardashevskiy <redacted>
Acked-by: Nicholas Piggin <npiggin@gmail.com>
[For KVM RISC-V]
Acked-by: Anup Patel <anup@brainfault.org>
---
Changes:
v2:
* removed ifdef for ARM64.
---
arch/arm64/kvm/arm.c | 1 +
arch/mips/kvm/mips.c | 3 +++
arch/powerpc/kvm/powerpc.c | 6 ++++++
arch/riscv/kvm/vm.c | 3 +++
arch/s390/kvm/kvm-s390.c | 3 +++
arch/x86/kvm/x86.c | 3 +++
virt/kvm/kvm_main.c | 1 -
7 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 2ff0ef62abad..d2daa4d375b5 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c@@ -218,6 +218,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_VCPU_ATTRIBUTES: case KVM_CAP_PTP_KVM: case KVM_CAP_ARM_SYSTEM_SUSPEND: + case KVM_CAP_IRQFD_RESAMPLE: r = 1; break; case KVM_CAP_SET_GUEST_DEBUG2:
diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
index a25e0b73ee70..0f3de470a73e 100644
--- a/arch/mips/kvm/mips.c
+++ b/arch/mips/kvm/mips.c@@ -1071,6 +1071,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_READONLY_MEM: case KVM_CAP_SYNC_MMU: case KVM_CAP_IMMEDIATE_EXIT: +#ifdef CONFIG_HAVE_KVM_IRQFD + case KVM_CAP_IRQFD_RESAMPLE: +#endif r = 1; break; case KVM_CAP_NR_VCPUS:
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index fb1490761c87..908ce8bd91c9 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c@@ -593,6 +593,12 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) break; #endif +#ifdef CONFIG_HAVE_KVM_IRQFD + case KVM_CAP_IRQFD_RESAMPLE: + r = !xive_enabled(); + break; +#endif + case KVM_CAP_PPC_ALLOC_HTAB: r = hv_enabled; break;
diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c
index 65a964d7e70d..0ef7a6168018 100644
--- a/arch/riscv/kvm/vm.c
+++ b/arch/riscv/kvm/vm.c@@ -65,6 +65,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_READONLY_MEM: case KVM_CAP_MP_STATE: case KVM_CAP_IMMEDIATE_EXIT: +#ifdef CONFIG_HAVE_KVM_IRQFD + case KVM_CAP_IRQFD_RESAMPLE: +#endif r = 1; break; case KVM_CAP_NR_VCPUS:
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index edfd4bbd0cba..03037b0d1cc8 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c@@ -577,6 +577,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_SET_GUEST_DEBUG: case KVM_CAP_S390_DIAG318: case KVM_CAP_S390_MEM_OP_EXTENSION: +#ifdef CONFIG_HAVE_KVM_IRQFD + case KVM_CAP_IRQFD_RESAMPLE: +#endif r = 1; break; case KVM_CAP_SET_GUEST_DEBUG2:
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 43a6a7efc6ec..efcc02230226 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c@@ -4395,6 +4395,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_VAPIC: case KVM_CAP_ENABLE_CAP: case KVM_CAP_VM_DISABLE_NX_HUGE_PAGES: +#ifdef CONFIG_HAVE_KVM_IRQFD + case KVM_CAP_IRQFD_RESAMPLE: +#endif r = 1; break; case KVM_CAP_EXIT_HYPERCALL:
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 584a5bab3af3..05cf94013f02 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c@@ -4447,7 +4447,6 @@ static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg) #endif #ifdef CONFIG_HAVE_KVM_IRQFD case KVM_CAP_IRQFD: - case KVM_CAP_IRQFD_RESAMPLE: #endif case KVM_CAP_IOEVENTFD_ANY_LENGTH: case KVM_CAP_CHECK_EXTENSION_VM:
--
2.37.3
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