From: Wanpeng Li <kernellwp@gmail.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>
Subject: [PATCH v2 1/2] KVM: X86: Filter out the broadcast dest for IPI fastpath
Date: Wed, 1 Apr 2020 08:19:21 +0800 [thread overview]
Message-ID: <1585700362-11892-1-git-send-email-wanpengli@tencent.com> (raw)
From: Wanpeng Li <wanpengli@tencent.com>
Except destination shorthand, a destination value 0xffffffff is used to
broadcast interrupts, let's also filter out this for single target IPI
fastpath.
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
v1 -> v2:
* update subject and patch description
arch/x86/kvm/lapic.c | 3 ---
arch/x86/kvm/lapic.h | 3 +++
arch/x86/kvm/x86.c | 3 ++-
3 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index e24d405..d528bed 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -59,9 +59,6 @@
#define MAX_APIC_VECTOR 256
#define APIC_VECTORS_PER_REG 32
-#define APIC_BROADCAST 0xFF
-#define X2APIC_BROADCAST 0xFFFFFFFFul
-
static bool lapic_timer_advance_dynamic __read_mostly;
#define LAPIC_TIMER_ADVANCE_ADJUST_MIN 100 /* clock cycles */
#define LAPIC_TIMER_ADVANCE_ADJUST_MAX 10000 /* clock cycles */
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index bc76860..25b77a6 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -17,6 +17,9 @@
#define APIC_BUS_CYCLE_NS 1
#define APIC_BUS_FREQUENCY (1000000000ULL / APIC_BUS_CYCLE_NS)
+#define APIC_BROADCAST 0xFF
+#define X2APIC_BROADCAST 0xFFFFFFFFul
+
enum lapic_mode {
LAPIC_MODE_DISABLED = 0,
LAPIC_MODE_INVALID = X2APIC_ENABLE,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 5e95950..5a645df 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1559,7 +1559,8 @@ static int handle_fastpath_set_x2apic_icr_irqoff(struct kvm_vcpu *vcpu, u64 data
if (((data & APIC_SHORT_MASK) == APIC_DEST_NOSHORT) &&
((data & APIC_DEST_MASK) == APIC_DEST_PHYSICAL) &&
- ((data & APIC_MODE_MASK) == APIC_DM_FIXED)) {
+ ((data & APIC_MODE_MASK) == APIC_DM_FIXED) &&
+ ((u32)(data >> 32) != X2APIC_BROADCAST)) {
data &= ~(1 << 12);
kvm_apic_send_ipi(vcpu->arch.apic, (u32)data, (u32)(data >> 32));
--
2.7.4
next reply other threads:[~2020-04-01 0:19 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-01 0:19 Wanpeng Li [this message]
2020-04-01 0:19 ` [PATCH v2 2/2] KVM: LAPIC: Don't need to clear IPI delivery status in x2apic mode Wanpeng Li
2020-04-01 0:35 ` Paolo Bonzini
2020-04-01 6:46 ` Wanpeng Li
2020-04-01 17:40 ` Nadav Amit
2020-04-01 23:01 ` Sean Christopherson
2020-04-02 0:14 ` Wanpeng Li
2020-04-01 10:17 ` Wanpeng Li
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