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client-ip=162.221.158.21; receiver=esa4.hc3370-68.iphmx.com; envelope-from="roger.pau@citrix.com"; x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: pXBYzvLxZRm6Xiq9shbr9C+4HNeavatDdYGCZcrPnlJsJu7s5muv1J/mpxqEGWhW586gY1bw/+ yPCGWBsaIschoETG90Tcb/8D68Q+DElprNPbj5XdODlyXk2E7KqK5Cc6i482FrCiUs+XUGePaV BOFxQAJR0pi9yzT/gZQEq59Rkcr2GZ78CQ6i/RUyj6qRVIuAiQJAB3rPYK8PdB7QYEz4HofjHl NaoLV80ZGq6ueNBfkw8z78py2JL2Y6UY9r6DqCyzlL85HD1BinFc0aphYCockl1xricTWTMrEQ dEI= X-SBRS: 2.7 X-MesageID: 8511638 X-Ironport-Server: esa4.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.68,278,1569297600"; d="scan'208";a="8511638" From: Roger Pau Monne To: Date: Thu, 7 Nov 2019 16:06:09 +0100 Message-ID: <20191107150609.93004-3-roger.pau@citrix.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191107150609.93004-1-roger.pau@citrix.com> References: <20191107150609.93004-1-roger.pau@citrix.com> MIME-Version: 1.0 Subject: [Xen-devel] [PATCH for-4.13 2/2] x86/ioapic: don't use raw entry reads/writes in clear_IO_APIC_pin X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Juergen Gross , Andrew Cooper , Wei Liu , Jan Beulich , Roger Pau Monne Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" clear_IO_APIC_pin can be called after the iommu has been enabled, and using raw entry reads and writes will result in a misconfiguration of the entries already setup to use the interrupt remapping table. This fixes the following panic seen on AMD Rome boxes: (XEN) [ 10.082154] ENABLING IO-APIC IRQs (XEN) [ 10.087789] -> Using new ACK method (XEN) [ 10.093738] Assertion 'get_rte_index(rte) == offset' failed at iommu_intr.c:328 Signed-off-by: Roger Pau Monné --- Cc: Juergen Gross --- xen/arch/x86/io_apic.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/xen/arch/x86/io_apic.c b/xen/arch/x86/io_apic.c index b9c66acdb3..13b41b46a3 100644 --- a/xen/arch/x86/io_apic.c +++ b/xen/arch/x86/io_apic.c @@ -514,13 +514,13 @@ static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin) entry.mask = 1; __ioapic_write_entry(apic, pin, false, entry); } - entry = __ioapic_read_entry(apic, pin, true); + entry = __ioapic_read_entry(apic, pin, false); if (entry.irr) { /* Make sure the trigger mode is set to level. */ if (!entry.trigger) { entry.trigger = 1; - __ioapic_write_entry(apic, pin, true, entry); + __ioapic_write_entry(apic, pin, false, entry); } __io_apic_eoi(apic, entry.vector, pin); } @@ -530,9 +530,9 @@ static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin) */ memset(&entry, 0, sizeof(entry)); entry.mask = 1; - __ioapic_write_entry(apic, pin, true, entry); + __ioapic_write_entry(apic, pin, false, entry); - entry = __ioapic_read_entry(apic, pin, true); + entry = __ioapic_read_entry(apic, pin, false); if (entry.irr) printk(KERN_ERR "IO-APIC%02x-%u: Unable to reset IRR\n", IO_APIC_ID(apic), pin);