iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

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

Browse Source 
commit f4b027c5c8199abd4fb6f00d67d380548dbfdfa8 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: 8479e04e7d6b ("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
Show Stats 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,