The following commit has been merged into the perf/core branch of tip:

Commit-ID: 5c7df80e2ce4c954c80eb4ecf5fa002a5ff5d2d6 Gitweb: https://git.kernel.org/tip/5c7df80e2ce4c954c80eb4ecf5fa002a5ff5d2d6 Author: Sean Christopherson seanjc@google.com AuthorDate: Thu, 11 Nov 2021 02:07:23 Committer: Peter Zijlstra peterz@infradead.org CommitterDate: Wed, 17 Nov 2021 14:49:06 +01:00

KVM: x86: Register perf callbacks after calling vendor's hardware_setup()

Wait to register perf callbacks until after doing vendor hardaware setup. VMX's hardware_setup() configures Intel Processor Trace (PT) mode, and a future fix to register the Intel PT guest interrupt hook if and only if Intel PT is exposed to the guest will consume the configured PT mode.

Delaying registration to hardware setup is effectively a nop as KVM's perf hooks all pivot on the per-CPU current_vcpu, which is non-NULL only when KVM is handling an IRQ/NMI in a VM-Exit path. I.e. current_vcpu will be NULL throughout both kvm_arch_init() and kvm_arch_hardware_setup().

Signed-off-by: Sean Christopherson seanjc@google.com Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Acked-by: Paolo Bonzini pbonzini@redhat.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20211111020738.2512932-3-seanjc@google.com --- arch/x86/kvm/x86.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index dc7eb5f..50f0cd1 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8626,8 +8626,6 @@ int kvm_arch_init(void *opaque)

kvm_timer_init();

- perf_register_guest_info_callbacks(&kvm_guest_cbs); - if (boot_cpu_has(X86_FEATURE_XSAVE)) { host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK); supported_xcr0 = host_xcr0 & KVM_SUPPORTED_XCR0; @@ -8659,7 +8657,6 @@ void kvm_arch_exit(void) clear_hv_tscchange_cb(); #endif kvm_lapic_exit(); - perf_unregister_guest_info_callbacks(&kvm_guest_cbs);

if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block, @@ -11225,6 +11222,8 @@ int kvm_arch_hardware_setup(void *opaque) memcpy(&kvm_x86_ops, ops->runtime_ops, sizeof(kvm_x86_ops)); kvm_ops_static_call_update();

+ perf_register_guest_info_callbacks(&kvm_guest_cbs); + if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES)) supported_xss = 0;

@@ -11252,6 +11251,8 @@ int kvm_arch_hardware_setup(void *opaque)

void kvm_arch_hardware_unsetup(void) { + perf_unregister_guest_info_callbacks(&kvm_guest_cbs); + static_call(kvm_x86_hardware_unsetup)(); }