Commit 8479e04e authored by Luwei Kang's avatar Luwei Kang Committed by Paolo Bonzini
Browse files

KVM: x86: Inject PMI for KVM guest 



Inject a PMI for KVM guest when Intel PT working
in Host-Guest mode and Guest ToPA entry memory buffer
was completely filled.

Signed-off-by: default avatarLuwei Kang <luwei.kang@intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 3a1e5e4a

arch/x86/events/intel/core.c

+5 −1
Original line number Diff line number Diff line
@@ -2307,6 +2307,10 @@ static int handle_pmi_common(struct pt_regs *regs, u64 status) 
	 */

	if (__test_and_clear_bit(55, (unsigned long *)&status)) {

		handled++;

		if (unlikely(perf_guest_cbs && perf_guest_cbs->is_in_guest() &&

			perf_guest_cbs->handle_intel_pt_intr))

			perf_guest_cbs->handle_intel_pt_intr();

		else

			intel_pt_interrupt();

	}

arch/x86/include/asm/msr-index.h

+4 −0
Original line number Diff line number Diff line
@@ -781,6 +781,10 @@ 
#define MSR_CORE_PERF_GLOBAL_CTRL	0x0000038f

#define MSR_CORE_PERF_GLOBAL_OVF_CTRL	0x00000390



/* PERF_GLOBAL_OVF_CTL bits */

#define MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI_BIT	55

#define MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI		(1ULL << MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI_BIT)



/* Geode defined MSRs */

#define MSR_GEODE_BUSCONT_CONF0		0x00001900

arch/x86/kvm/x86.c

+10 −0
Original line number Diff line number Diff line
@@ -6839,10 +6839,20 @@ static unsigned long kvm_get_guest_ip(void) 
	return ip;

}



static void kvm_handle_intel_pt_intr(void)

{

	struct kvm_vcpu *vcpu = __this_cpu_read(current_vcpu);



	kvm_make_request(KVM_REQ_PMI, vcpu);

	__set_bit(MSR_CORE_PERF_GLOBAL_OVF_CTRL_TRACE_TOPA_PMI_BIT,

			(unsigned long *)&vcpu->arch.pmu.global_status);

}



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,

};



static void kvm_set_mmio_spte_mask(void)

include/linux/perf_event.h

+1 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ struct perf_guest_info_callbacks { 
	int				(*is_in_guest)(void);

	int				(*is_user_mode)(void);

	unsigned long			(*get_guest_ip)(void);

	void				(*handle_intel_pt_intr)(void);

};



#ifdef CONFIG_HAVE_HW_BREAKPOINT