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| author | Sean Christopherson <seanjc@google.com> | 2021-11-11 02:07:29 +0000 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-11-17 14:49:08 +0100 |
| commit | 2aef6f306b39bbe74e2287d6e2ee07c4867d87d0 (patch) | |
| tree | 53b56630ba56b3f246289fdcd12096f10b5bf921 /arch | |
| parent | 1c3430516b0732d923de9fd3bfb3e2e537eeb235 (diff) | |
| download | lwn-2aef6f306b39bbe74e2287d6e2ee07c4867d87d0.tar.gz lwn-2aef6f306b39bbe74e2287d6e2ee07c4867d87d0.zip | |
perf: Force architectures to opt-in to guest callbacks
Introduce GUEST_PERF_EVENTS and require architectures to select it to
allow registering and using guest callbacks in perf. This will hopefully
make it more difficult for new architectures to add useless "support" for
guest callbacks, e.g. via copy+paste.
Stubbing out the helpers has the happy bonus of avoiding a load of
perf_guest_cbs when GUEST_PERF_EVENTS=n on arm64/x86.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Link: https://lore.kernel.org/r/20211111020738.2512932-9-seanjc@google.com
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kvm/Kconfig | 1 | ||||
| -rw-r--r-- | arch/x86/kvm/Kconfig | 1 | ||||
| -rw-r--r-- | arch/x86/xen/Kconfig | 1 |
3 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig index 8ffcbe29395e..e9761d84f982 100644 --- a/arch/arm64/kvm/Kconfig +++ b/arch/arm64/kvm/Kconfig @@ -39,6 +39,7 @@ menuconfig KVM select HAVE_KVM_IRQ_BYPASS select HAVE_KVM_VCPU_RUN_PID_CHANGE select SCHED_INFO + select GUEST_PERF_EVENTS if PERF_EVENTS help Support hosting virtualized guest machines. diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index 619186138176..47bdbe705a76 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -36,6 +36,7 @@ config KVM select KVM_MMIO select SCHED_INFO select PERF_EVENTS + select GUEST_PERF_EVENTS select HAVE_KVM_MSI select HAVE_KVM_CPU_RELAX_INTERCEPT select HAVE_KVM_NO_POLL diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig index 6bcd3d8ca6ac..85246dd9faa1 100644 --- a/arch/x86/xen/Kconfig +++ b/arch/x86/xen/Kconfig @@ -23,6 +23,7 @@ config XEN_PV select PARAVIRT_XXL select XEN_HAVE_PVMMU select XEN_HAVE_VPMU + select GUEST_PERF_EVENTS help Support running as a Xen PV guest. |