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From 77782045cff9546feaf8863c0e7552343a488c6e Mon Sep 17 00:00:00 2001
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From: Xiao Wang <jasowang@redhat.com>
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Date: Thu, 16 Aug 2018 06:09:03 +0200
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Subject: [PATCH 2/5] e1000e: Prevent MSI/MSI-X storms
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RH-Author: Xiao Wang <jasowang@redhat.com>
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Message-id: <1534399743-23973-3-git-send-email-jasowang@redhat.com>
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Patchwork-id: 81849
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O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH 2/2] e1000e: Prevent MSI/MSI-X storms
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Bugzilla: 1596010
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RH-Acked-by: wexu@redhat.com
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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From: Jan Kiszka <jan.kiszka@siemens.com>
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Only signal MSI/MSI-X events on rising edges. So far we re-triggered the
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interrupt sources even if the guest did no consumed the pending one,
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easily causing interrupt storms.
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Issue was observable with Linux 4.16 e1000e driver when MSI-X was used.
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Vector 2 was causing interrupt storms after the driver activated the
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device.
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Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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Signed-off-by: Jason Wang <jasowang@redhat.com>
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(cherry picked from commit 4712c158c5276fd3c401152f4bb5c3fccf185946)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/net/e1000e_core.c | 11 +++++++++++
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hw/net/e1000e_core.h | 2 ++
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2 files changed, 13 insertions(+)
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diff --git a/hw/net/e1000e_core.c b/hw/net/e1000e_core.c
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index 9504891..2a221c2 100644
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--- a/hw/net/e1000e_core.c
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+++ b/hw/net/e1000e_core.c
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@@ -2023,6 +2023,7 @@ e1000e_msix_notify_one(E1000ECore *core, uint32_t cause, uint32_t int_cfg)
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effective_eiac = core->mac[EIAC] & cause;
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core->mac[ICR] &= ~effective_eiac;
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+ core->msi_causes_pending &= ~effective_eiac;
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if (!(core->mac[CTRL_EXT] & E1000_CTRL_EXT_IAME)) {
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core->mac[IMS] &= ~effective_eiac;
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@@ -2119,6 +2120,13 @@ e1000e_send_msi(E1000ECore *core, bool msix)
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{
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uint32_t causes = core->mac[ICR] & core->mac[IMS] & ~E1000_ICR_ASSERTED;
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+ core->msi_causes_pending &= causes;
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+ causes ^= core->msi_causes_pending;
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+ if (causes == 0) {
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+ return;
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+ }
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+ core->msi_causes_pending |= causes;
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+
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if (msix) {
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e1000e_msix_notify(core, causes);
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} else {
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@@ -2156,6 +2164,9 @@ e1000e_update_interrupt_state(E1000ECore *core)
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core->mac[ICS] = core->mac[ICR];
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interrupts_pending = (core->mac[IMS] & core->mac[ICR]) ? true : false;
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+ if (!interrupts_pending) {
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+ core->msi_causes_pending = 0;
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+ }
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trace_e1000e_irq_pending_interrupts(core->mac[ICR] & core->mac[IMS],
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core->mac[ICR], core->mac[IMS]);
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diff --git a/hw/net/e1000e_core.h b/hw/net/e1000e_core.h
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index 7d8ff41..63a1551 100644
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--- a/hw/net/e1000e_core.h
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+++ b/hw/net/e1000e_core.h
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@@ -109,6 +109,8 @@ struct E1000Core {
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NICState *owner_nic;
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PCIDevice *owner;
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void (*owner_start_recv)(PCIDevice *d);
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+
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+ uint32_t msi_causes_pending;
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};
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void
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--
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1.8.3.1
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