| Message ID | 20210922000533.713300-4-seanjc@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | perf: KVM: Fix, optimize, and clean up callbacks | expand |
On 22/09/21 02:05, Sean Christopherson wrote: > Override the Processor Trace (PT) interrupt handler for guest mode if and > only if PT is configured for host+guest mode, i.e. is being used > independently by both host and guest. If PT is configured for system > mode, the host fully controls PT and must handle all events. > > Fixes: 8479e04e7d6b ("KVM: x86: Inject PMI for KVM guest") > Cc: stable@vger.kernel.org > Cc: Like Xu <like.xu.linux@gmail.com> > Reported-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> > Reported-by: Artem Kashkanov <artem.kashkanov@intel.com> > Signed-off-by: Sean Christopherson <seanjc@google.com> > --- > arch/x86/include/asm/kvm_host.h | 1 + > arch/x86/kvm/vmx/vmx.c | 1 + > arch/x86/kvm/x86.c | 5 ++++- > 3 files changed, 6 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h > index 09b256db394a..1ea4943a73d7 100644 > --- a/arch/x86/include/asm/kvm_host.h > +++ b/arch/x86/include/asm/kvm_host.h > @@ -1494,6 +1494,7 @@ struct kvm_x86_init_ops { > int (*disabled_by_bios)(void); > int (*check_processor_compatibility)(void); > int (*hardware_setup)(void); > + bool (*intel_pt_intr_in_guest)(void); > > struct kvm_x86_ops *runtime_ops; > }; > diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c > index fada1055f325..f19d72136f77 100644 > --- a/arch/x86/kvm/vmx/vmx.c > +++ b/arch/x86/kvm/vmx/vmx.c > @@ -7896,6 +7896,7 @@ static struct kvm_x86_init_ops vmx_init_ops __initdata = { > .disabled_by_bios = vmx_disabled_by_bios, > .check_processor_compatibility = vmx_check_processor_compat, > .hardware_setup = hardware_setup, > + .intel_pt_intr_in_guest = vmx_pt_mode_is_host_guest, > > .runtime_ops = &vmx_x86_ops, > }; > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index fb6015f97f9e..ffc6c2d73508 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -8305,7 +8305,7 @@ static struct perf_guest_info_callbacks kvm_guest_cbs = { > .is_in_guest = kvm_is_in_guest, > .is_user_mode = kvm_is_user_mode, > .get_guest_ip = kvm_get_guest_ip, > - .handle_intel_pt_intr = kvm_handle_intel_pt_intr, > + .handle_intel_pt_intr = NULL, > }; > > #ifdef CONFIG_X86_64 > @@ -11061,6 +11061,8 @@ int kvm_arch_hardware_setup(void *opaque) > memcpy(&kvm_x86_ops, ops->runtime_ops, sizeof(kvm_x86_ops)); > kvm_ops_static_call_update(); > > + if (ops->intel_pt_intr_in_guest && ops->intel_pt_intr_in_guest()) > + kvm_guest_cbs.handle_intel_pt_intr = kvm_handle_intel_pt_intr; > perf_register_guest_info_callbacks(&kvm_guest_cbs); > > if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES)) > @@ -11091,6 +11093,7 @@ int kvm_arch_hardware_setup(void *opaque) > void kvm_arch_hardware_unsetup(void) > { > perf_unregister_guest_info_callbacks(&kvm_guest_cbs); > + kvm_guest_cbs.handle_intel_pt_intr = NULL; > > static_call(kvm_x86_hardware_unsetup)(); > } > Acked-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 09b256db394a..1ea4943a73d7 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -1494,6 +1494,7 @@ struct kvm_x86_init_ops { int (*disabled_by_bios)(void); int (*check_processor_compatibility)(void); int (*hardware_setup)(void); + bool (*intel_pt_intr_in_guest)(void); struct kvm_x86_ops *runtime_ops; }; diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index fada1055f325..f19d72136f77 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -7896,6 +7896,7 @@ static struct kvm_x86_init_ops vmx_init_ops __initdata = { .disabled_by_bios = vmx_disabled_by_bios, .check_processor_compatibility = vmx_check_processor_compat, .hardware_setup = hardware_setup, + .intel_pt_intr_in_guest = vmx_pt_mode_is_host_guest, .runtime_ops = &vmx_x86_ops, }; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index fb6015f97f9e..ffc6c2d73508 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -8305,7 +8305,7 @@ static struct perf_guest_info_callbacks kvm_guest_cbs = { .is_in_guest = kvm_is_in_guest, .is_user_mode = kvm_is_user_mode, .get_guest_ip = kvm_get_guest_ip, - .handle_intel_pt_intr = kvm_handle_intel_pt_intr, + .handle_intel_pt_intr = NULL, }; #ifdef CONFIG_X86_64 @@ -11061,6 +11061,8 @@ int kvm_arch_hardware_setup(void *opaque) memcpy(&kvm_x86_ops, ops->runtime_ops, sizeof(kvm_x86_ops)); kvm_ops_static_call_update(); + if (ops->intel_pt_intr_in_guest && ops->intel_pt_intr_in_guest()) + kvm_guest_cbs.handle_intel_pt_intr = kvm_handle_intel_pt_intr; perf_register_guest_info_callbacks(&kvm_guest_cbs); if (!kvm_cpu_cap_has(X86_FEATURE_XSAVES)) @@ -11091,6 +11093,7 @@ int kvm_arch_hardware_setup(void *opaque) void kvm_arch_hardware_unsetup(void) { perf_unregister_guest_info_callbacks(&kvm_guest_cbs); + kvm_guest_cbs.handle_intel_pt_intr = NULL; static_call(kvm_x86_hardware_unsetup)(); }
Override the Processor Trace (PT) interrupt handler for guest mode if and only if PT is configured for host+guest mode, i.e. is being used independently by both host and guest. If PT is configured for system mode, the host fully controls PT and must handle all events. Fixes: 8479e04e7d6b ("KVM: x86: Inject PMI for KVM guest") Cc: stable@vger.kernel.org Cc: Like Xu <like.xu.linux@gmail.com> Reported-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Reported-by: Artem Kashkanov <artem.kashkanov@intel.com> Signed-off-by: Sean Christopherson <seanjc@google.com> --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/vmx/vmx.c | 1 + arch/x86/kvm/x86.c | 5 ++++- 3 files changed, 6 insertions(+), 1 deletion(-)