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KVM: x86: Inject PMI for KVM guest

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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: Luwei Kang <luwei.kang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Luwei Kang 2019-02-18 19:26:07 -05:00 • committed by Paolo Bonzini
parent 3a1e5e4a2c
commit 8479e04e7d
4 changed files with 20 additions and 1 deletions
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6
arch/x86/events/intel/core.c
View file

@ -2307,7 +2307,11 @@ static int handle_pmi_common(struct pt_regs *regs, u64 status)
*/ */
if (__test_and_clear_bit(55, (unsigned long *)&status)) { if (__test_and_clear_bit(55, (unsigned long *)&status)) {
handled++; handled++;
intel_pt_interrupt(); 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();
} }
/* /*

4
arch/x86/include/asm/msr-index.h
View file

@ -781,6 +781,10 @@
#define MSR_CORE_PERF_GLOBAL_CTRL 0x0000038f #define MSR_CORE_PERF_GLOBAL_CTRL 0x0000038f
#define MSR_CORE_PERF_GLOBAL_OVF_CTRL 0x00000390 #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 */ /* Geode defined MSRs */
#define MSR_GEODE_BUSCONT_CONF0 0x00001900 #define MSR_GEODE_BUSCONT_CONF0 0x00001900

10
arch/x86/kvm/x86.c
View file

@ -6839,10 +6839,20 @@ static unsigned long kvm_get_guest_ip(void)
return ip; 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 = { static struct perf_guest_info_callbacks kvm_guest_cbs = {
.is_in_guest = kvm_is_in_guest, .is_in_guest = kvm_is_in_guest,
.is_user_mode = kvm_is_user_mode, .is_user_mode = kvm_is_user_mode,
.get_guest_ip = kvm_get_guest_ip, .get_guest_ip = kvm_get_guest_ip,
.handle_intel_pt_intr = kvm_handle_intel_pt_intr,
}; };
static void kvm_set_mmio_spte_mask(void) static void kvm_set_mmio_spte_mask(void)

1
include/linux/perf_event.h
View file

@ -30,6 +30,7 @@ struct perf_guest_info_callbacks {
int (*is_in_guest)(void); int (*is_in_guest)(void);
int (*is_user_mode)(void); int (*is_user_mode)(void);
unsigned long (*get_guest_ip)(void); unsigned long (*get_guest_ip)(void);
void (*handle_intel_pt_intr)(void);
}; };
#ifdef CONFIG_HAVE_HW_BREAKPOINT #ifdef CONFIG_HAVE_HW_BREAKPOINT