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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: R/2yAziJ4wFrsoOyaDMU9g6IefXn3HPNFcBsl9C6AtxSsrPYhbc1XV7clN2WwCHcqDveTMJJvs OZxK4qTRtSgZc/eEf5ZNsBarb8miF+pOdkEWuyOfDdN6Bn/4ISlItX3lITkB0/zjVae7f2MqVN GLCRQkrdkKYqeVN/PvQ8rKxpEh8msBwxAKPI1O/nYPXh8KlTw626nRchhmaB7gAYVXrluVUSti XLg0TO4+j1dfeqlV/Q3bSvtw5/XedCXOn++OBlz7QQXJuSp6Gq5ekntBCSJ4cZxPx5AvWaVLJM 3Kg= X-SBRS: 2.7 X-MesageID: 9206662 X-Ironport-Server: esa4.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.69,226,1571716800"; d="scan'208";a="9206662" From: Roger Pau Monne To: Date: Thu, 21 Nov 2019 16:54:09 +0100 Message-ID: <20191121155411.13250-2-roger.pau@citrix.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191121155411.13250-1-roger.pau@citrix.com> References: <20191121155411.13250-1-roger.pau@citrix.com> MIME-Version: 1.0 Subject: [Xen-devel] [PATCH 1/3] x86/ioapic: only use dest32 with x2apic and interrupt remapping enabled 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: Andrew Cooper , Wei Liu , Jan Beulich , Roger Pau Monne Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" The IO-APIC code assumes that x2apic being enabled also implies interrupt remapping being enabled, and hence will use the 32bit destination field in the IO-APIC entry. This is safe now, but there's no reason to not enable x2APIC even without interrupt remapping, and hence the IO-APIC code needs to use the 32 bit destination field only when both interrupt remapping and x2APIC are enabled. Signed-off-by: Roger Pau Monné --- xen/arch/x86/io_apic.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/xen/arch/x86/io_apic.c b/xen/arch/x86/io_apic.c index 732b57995c..9d38568fba 100644 --- a/xen/arch/x86/io_apic.c +++ b/xen/arch/x86/io_apic.c @@ -964,7 +964,7 @@ static hw_irq_controller ioapic_edge_type; #define IOAPIC_LEVEL 1 #define SET_DEST(ent, mode, val) do { \ - if (x2apic_enabled) \ + if (x2apic_enabled && iommu_intremap) \ (ent).dest.dest32 = (val); \ else \ (ent).dest.mode.mode##_dest = (val); \ @@ -1194,14 +1194,14 @@ static void /*__init*/ __print_IO_APIC(bool boot) printk(KERN_DEBUG ".... IRQ redirection table:\n"); printk(KERN_DEBUG " NR %s Msk Trg IRR Pol Stat DstM DelM Vec\n", - x2apic_enabled ? " DestID" : "Dst"); + (x2apic_enabled && iommu_intremap) ? " DestID" : "Dst"); for (i = 0; i <= reg_01.bits.entries; i++) { struct IO_APIC_route_entry entry; entry = ioapic_read_entry(apic, i, 0); - if ( x2apic_enabled ) + if ( x2apic_enabled && iommu_intremap ) printk(KERN_DEBUG " %02x %08x", i, entry.dest.dest32); else printk(KERN_DEBUG " %02x %02x ", i, @@ -2504,9 +2504,9 @@ void dump_ioapic_irq_info(void) rte.dest_mode ? 'L' : 'P', rte.delivery_status, rte.polarity, rte.irr, rte.trigger ? 'L' : 'E', rte.mask, - x2apic_enabled ? 8 : 2, - x2apic_enabled ? rte.dest.dest32 - : rte.dest.logical.logical_dest); + (x2apic_enabled && iommu_intremap) ? 8 : 2, + (x2apic_enabled && iommu_intremap) ? + rte.dest.dest32 : rte.dest.logical.logical_dest); if ( entry->next == 0 ) break;