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KVM: x86: Register Processor Trace interrupt hook iff PT enabled in guest

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commit f4b027c5c8 upstream.

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: 8479e04e7d ("KVM: x86: Inject PMI for KVM guest")
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>
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/20211111020738.2512932-4-seanjc@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Christopherson
2021-11-11 02:07:24 +00:00
committed by Greg Kroah-Hartman
parent 723acd75a0
commit 413b427f5f
3 changed files with 6 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/include/asm/kvm_host.h
View File

@@ -1306,6 +1306,7 @@ 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;
};

1
arch/x86/kvm/vmx/vmx.c
View File

@@ -7915,6 +7915,7 @@ 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,
};

5
arch/x86/kvm/x86.c
View File

@@ -7882,7 +7882,7 @@ 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
@@ -8005,6 +8005,8 @@ int kvm_arch_init(void *opaque)
PT_PRESENT_MASK, 0, sme_me_mask);
kvm_timer_init();
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 (boot_cpu_has(X86_FEATURE_XSAVE)) {
@@ -8042,6 +8044,7 @@ void kvm_arch_exit(void)
#endif
kvm_lapic_exit();
perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
kvm_guest_cbs.handle_intel_pt_intr = NULL;
if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,