From patchwork Thu Dec 9 22:08:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 12668363 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 24311C433EF for ; Thu, 9 Dec 2021 22:09:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233254AbhLIWMw (ORCPT ); Thu, 9 Dec 2021 17:12:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59514 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231272AbhLIWMv (ORCPT ); Thu, 9 Dec 2021 17:12:51 -0500 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 65607C0617A2 for ; Thu, 9 Dec 2021 14:09:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding: MIME-Version:Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-Type: Content-ID:Content-Description:In-Reply-To:References; bh=aF2VJz818y4HgBgf3CkuDSyw9YreBIt/kI+rCIY9Axk=; b=pd83DsM8isN2L7/F5QSmaEuF8w Cb72uwtBkx3wLjoJxWtntmtw3vlWCIQD3LoMV3uZkgm5+D45etOzfA7zmbtGEqdFyCMyAm0S+I7Vr b+bMWQr4naWZOfB6WQ9UzAtcCqasZdd3muv8LHwnS9AoaIN4AZ4m0lluZx1QMA+eSTCEimtM6Ervu 8TG+R81UWgdBwL8ATQ27MndeLeU9tai/Eg8EP8i1ouSbEwd8STErcItqyiQTO9y4QEJe960w11DcP RbSVgEGQtk2nEN+UAEAmpq3d5AHOxBUn9bafB+bDbmRCU/mv/98/VJZl7dX1XGLRGAUGwtuJq4QIt i6Th7hDg==; Received: from i7.infradead.org ([2001:8b0:10b:1:21e:67ff:fecb:7a92]) by desiato.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mvRaj-000RNe-Aq; Thu, 09 Dec 2021 22:08:50 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1mvRai-0003su-UJ; Thu, 09 Dec 2021 22:08:40 +0000 From: David Woodhouse To: qemu-devel@nongnu.org Cc: "Michael S. Tsirkin" , Peter Xu , Jason Wang , Paolo Bonzini , Richard Henderson , Eduardo Habkost , Marcel Apfelbaum , Marcelo Tosatti , kvm@vger.kernel.org Subject: [PATCH v2 1/4] target/i386: Fix sanity check on max APIC ID / X2APIC enablement Date: Thu, 9 Dec 2021 22:08:37 +0000 Message-Id: <20211209220840.14889-1-dwmw2@infradead.org> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Sender: David Woodhouse X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The check on x86ms->apic_id_limit in pc_machine_done() had two problems. Firstly, we need KVM to support the X2APIC API in order to allow IRQ delivery to APICs >= 255. So we need to call/check kvm_enable_x2apic(), which was done elsewhere in *some* cases but not all. Secondly, microvm needs the same check. So move it from pc_machine_done() to x86_cpus_init() where it will work for both. The check in kvm_cpu_instance_init() is now redundant and can be dropped. Signed-off-by: David Woodhouse Acked-by: Claudio Fontana --- hw/i386/pc.c | 8 -------- hw/i386/x86.c | 16 ++++++++++++++++ target/i386/kvm/kvm-cpu.c | 2 +- 3 files changed, 17 insertions(+), 9 deletions(-) diff --git a/hw/i386/pc.c b/hw/i386/pc.c index a2ef40ecbc..9959f93216 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -736,14 +736,6 @@ void pc_machine_done(Notifier *notifier, void *data) /* update FW_CFG_NB_CPUS to account for -device added CPUs */ fw_cfg_modify_i16(x86ms->fw_cfg, FW_CFG_NB_CPUS, x86ms->boot_cpus); } - - - if (x86ms->apic_id_limit > 255 && !xen_enabled() && - !kvm_irqchip_in_kernel()) { - error_report("current -smp configuration requires kernel " - "irqchip support."); - exit(EXIT_FAILURE); - } } void pc_guest_info_init(PCMachineState *pcms) diff --git a/hw/i386/x86.c b/hw/i386/x86.c index b84840a1bb..f64639b873 100644 --- a/hw/i386/x86.c +++ b/hw/i386/x86.c @@ -39,6 +39,7 @@ #include "sysemu/replay.h" #include "sysemu/sysemu.h" #include "sysemu/cpu-timers.h" +#include "sysemu/xen.h" #include "trace.h" #include "hw/i386/x86.h" @@ -136,6 +137,21 @@ void x86_cpus_init(X86MachineState *x86ms, int default_cpu_version) */ x86ms->apic_id_limit = x86_cpu_apic_id_from_index(x86ms, ms->smp.max_cpus - 1) + 1; + + /* + * Can we support APIC ID 255 or higher? + * + * Under Xen: yes. + * With userspace emulated lapic: no + * With KVM's in-kernel lapic: only if X2APIC API is enabled. + */ + if (x86ms->apic_id_limit > 255 && !xen_enabled() && + (!kvm_irqchip_in_kernel() || !kvm_enable_x2apic())) { + error_report("current -smp configuration requires kernel " + "irqchip and X2APIC API support."); + exit(EXIT_FAILURE); + } + possible_cpus = mc->possible_cpu_arch_ids(ms); for (i = 0; i < ms->smp.cpus; i++) { x86_cpu_new(x86ms, possible_cpus->cpus[i].arch_id, &error_fatal); diff --git a/target/i386/kvm/kvm-cpu.c b/target/i386/kvm/kvm-cpu.c index d95028018e..c60cb2dafb 100644 --- a/target/i386/kvm/kvm-cpu.c +++ b/target/i386/kvm/kvm-cpu.c @@ -165,7 +165,7 @@ static void kvm_cpu_instance_init(CPUState *cs) /* only applies to builtin_x86_defs cpus */ if (!kvm_irqchip_in_kernel()) { x86_cpu_change_kvm_default("x2apic", "off"); - } else if (kvm_irqchip_is_split() && kvm_enable_x2apic()) { + } else if (kvm_irqchip_is_split()) { x86_cpu_change_kvm_default("kvm-msi-ext-dest-id", "on"); } From patchwork Thu Dec 9 22:08:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 12668365 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9A837C433FE for ; Thu, 9 Dec 2021 22:09:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231400AbhLIWMw (ORCPT ); Thu, 9 Dec 2021 17:12:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59512 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231253AbhLIWMv (ORCPT ); Thu, 9 Dec 2021 17:12:51 -0500 Received: from desiato.infradead.org (desiato.infradead.org [IPv6:2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 651B0C0617A1 for ; Thu, 9 Dec 2021 14:09:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=P6f35iHkW27bYKrXKVfssYuF4aX8DsMoePwrZGh388Y=; b=QFa5QICMSxxiDRr8Beg7VYfEAv p/DL6z6HrvRONhadMeoMETfekFz9AqCkTnmenSpp+Ux4r+8g7TFUvQSQhMnj+vGkjk+A/IAA6S+EE XUAN6akFNVm/0Kz118EXnIGBPwgDbSwlo+7RdRQZ5aYwFWzqdK0+mlZLF+Q0KgKAVp3w473P2nZh+ sxoBBlKKukb+0LR9j5k53fyt8//2JvjC/WNzVLxgCyADH3dEUcUjqfe2HzuKAJGvUgyLrhWKjAfXi o1cW6D21kV9tqjLQUKHE9qbQ1kdop9T4k6dJdjcCpheZVJrZCOx5uDo65hAAN9LHlD5Nr5o4dmrQz Vj+QKFsw==; Received: from i7.infradead.org ([2001:8b0:10b:1:21e:67ff:fecb:7a92]) by desiato.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mvRaj-000RNf-B2; Thu, 09 Dec 2021 22:08:50 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1mvRaj-0003sx-0h; Thu, 09 Dec 2021 22:08:41 +0000 From: David Woodhouse To: qemu-devel@nongnu.org Cc: "Michael S. Tsirkin" , Peter Xu , Jason Wang , Paolo Bonzini , Richard Henderson , Eduardo Habkost , Marcel Apfelbaum , Marcelo Tosatti , kvm@vger.kernel.org Subject: [PATCH v2 2/4] intel_iommu: Support IR-only mode without DMA translation Date: Thu, 9 Dec 2021 22:08:38 +0000 Message-Id: <20211209220840.14889-2-dwmw2@infradead.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211209220840.14889-1-dwmw2@infradead.org> References: <20211209220840.14889-1-dwmw2@infradead.org> MIME-Version: 1.0 Sender: David Woodhouse X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: David Woodhouse By setting none of the SAGAW bits we can indicate to a guest that DMA translation isn't supported. Tested by booting Windows 10, as well as Linux guests with the fix at https://git.kernel.org/torvalds/c/c40aaaac10 Signed-off-by: David Woodhouse Acked-by: Claudio Fontana Reviewed-by: Peter Xu --- hw/i386/intel_iommu.c | 14 ++++++++++---- include/hw/i386/intel_iommu.h | 1 + 2 files changed, 11 insertions(+), 4 deletions(-) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index f584449d8d..9a3cb2b789 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -2202,7 +2202,7 @@ static void vtd_handle_gcmd_write(IntelIOMMUState *s) uint32_t changed = status ^ val; trace_vtd_reg_write_gcmd(status, val); - if (changed & VTD_GCMD_TE) { + if ((changed & VTD_GCMD_TE) && s->dma_translation) { /* Translation enable/disable */ vtd_handle_gcmd_te(s, val & VTD_GCMD_TE); } @@ -3100,6 +3100,7 @@ static Property vtd_properties[] = { DEFINE_PROP_BOOL("caching-mode", IntelIOMMUState, caching_mode, FALSE), DEFINE_PROP_BOOL("x-scalable-mode", IntelIOMMUState, scalable_mode, FALSE), DEFINE_PROP_BOOL("dma-drain", IntelIOMMUState, dma_drain, true), + DEFINE_PROP_BOOL("dma-translation", IntelIOMMUState, dma_translation, true), DEFINE_PROP_END_OF_LIST(), }; @@ -3605,12 +3606,17 @@ static void vtd_init(IntelIOMMUState *s) s->next_frcd_reg = 0; s->cap = VTD_CAP_FRO | VTD_CAP_NFR | VTD_CAP_ND | VTD_CAP_MAMV | VTD_CAP_PSI | VTD_CAP_SLLPS | - VTD_CAP_SAGAW_39bit | VTD_CAP_MGAW(s->aw_bits); + VTD_CAP_MGAW(s->aw_bits); if (s->dma_drain) { s->cap |= VTD_CAP_DRAIN; } - if (s->aw_bits == VTD_HOST_AW_48BIT) { - s->cap |= VTD_CAP_SAGAW_48bit; + if (s->dma_translation) { + if (s->aw_bits >= VTD_HOST_AW_39BIT) { + s->cap |= VTD_CAP_SAGAW_39bit; + } + if (s->aw_bits >= VTD_HOST_AW_48BIT) { + s->cap |= VTD_CAP_SAGAW_48bit; + } } s->ecap = VTD_ECAP_QI | VTD_ECAP_IRO; diff --git a/include/hw/i386/intel_iommu.h b/include/hw/i386/intel_iommu.h index 41783ee46d..42d6a6a636 100644 --- a/include/hw/i386/intel_iommu.h +++ b/include/hw/i386/intel_iommu.h @@ -266,6 +266,7 @@ struct IntelIOMMUState { bool buggy_eim; /* Force buggy EIM unless eim=off */ uint8_t aw_bits; /* Host/IOVA address width (in bits) */ bool dma_drain; /* Whether DMA r/w draining enabled */ + bool dma_translation; /* Whether DMA translation supported */ /* * Protects IOMMU states in general. Currently it protects the From patchwork Thu Dec 9 22:08:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 12668359 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 191A7C433FE for ; Thu, 9 Dec 2021 22:09:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232314AbhLIWMg (ORCPT ); Thu, 9 Dec 2021 17:12:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59440 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231180AbhLIWMe (ORCPT ); Thu, 9 Dec 2021 17:12:34 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4600BC061746 for ; Thu, 9 Dec 2021 14:08:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=6T8H5SlZi4uUdKoCbrgDO6stZljqx7xoEBEiCfG7UWI=; b=CciiV4aJXjCUHa+0cePD85FEhI U9bgUiT8WbOi8acWFbkot4IWwgXOTXp3+SjFSvg9D+ZdgnIy3HBAddxtVtPGNUpOZO3FZRxbDOR1o YTlXxE6zqjNdpNyVNX9ZgNjArRlcEAxgaPQh0q3Nb5B31sOR3uLZRlTR4XfOHeIqDUP24mHMQoj/o 6F9VfvYmtqXoA7MBGrObhccuveuFog8Sv+LDkwmbOXxdeGOBu4FdYx67culwfyxRSUI4FpUBRwl7z MnWs7DETKjqWg98b+qIjX500QvWMOyXIU1M0JZj6A3XXXF7Q9AqSAbo+j3hZCFCOxeJqgIm5/UK4m Ep+ls07Q==; Received: from i7.infradead.org ([2001:8b0:10b:1:21e:67ff:fecb:7a92]) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mvRai-009loX-S9; Thu, 09 Dec 2021 22:08:41 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1mvRaj-0003t0-31; Thu, 09 Dec 2021 22:08:41 +0000 From: David Woodhouse To: qemu-devel@nongnu.org Cc: "Michael S. Tsirkin" , Peter Xu , Jason Wang , Paolo Bonzini , Richard Henderson , Eduardo Habkost , Marcel Apfelbaum , Marcelo Tosatti , kvm@vger.kernel.org Subject: [PATCH v2 3/4] intel_iommu: Only allow interrupt remapping to be enabled if it's supported Date: Thu, 9 Dec 2021 22:08:39 +0000 Message-Id: <20211209220840.14889-3-dwmw2@infradead.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211209220840.14889-1-dwmw2@infradead.org> References: <20211209220840.14889-1-dwmw2@infradead.org> MIME-Version: 1.0 Sender: David Woodhouse X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: David Woodhouse We should probably check if we were meant to be exposing IR, before letting the guest turn the IRE bit on. Signed-off-by: David Woodhouse Reviewed-by: Peter Xu Acked-by: Jason Wang --- hw/i386/intel_iommu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index 9a3cb2b789..bd288d45bb 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -2197,6 +2197,7 @@ static void vtd_handle_gcmd_ire(IntelIOMMUState *s, bool en) /* Handle write to Global Command Register */ static void vtd_handle_gcmd_write(IntelIOMMUState *s) { + X86IOMMUState *x86_iommu = X86_IOMMU_DEVICE(s); uint32_t status = vtd_get_long_raw(s, DMAR_GSTS_REG); uint32_t val = vtd_get_long_raw(s, DMAR_GCMD_REG); uint32_t changed = status ^ val; @@ -2218,7 +2219,8 @@ static void vtd_handle_gcmd_write(IntelIOMMUState *s) /* Set/update the interrupt remapping root-table pointer */ vtd_handle_gcmd_sirtp(s); } - if (changed & VTD_GCMD_IRE) { + if ((changed & VTD_GCMD_IRE) && + x86_iommu_ir_supported(x86_iommu)) { /* Interrupt remap enable/disable */ vtd_handle_gcmd_ire(s, val & VTD_GCMD_IRE); } From patchwork Thu Dec 9 22:08:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 12668361 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B0AEDC433F5 for ; Thu, 9 Dec 2021 22:09:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232340AbhLIWMg (ORCPT ); Thu, 9 Dec 2021 17:12:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59448 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231272AbhLIWMg (ORCPT ); Thu, 9 Dec 2021 17:12:36 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EF913C0617A1 for ; Thu, 9 Dec 2021 14:09:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Sender:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description; bh=/5Qkoh8pYH5HbNhrnTekBbg9zajs4rUylaVCWNLcGsk=; b=BAsinmt782kleeOm9L/2dn1uZI BogZi8zGxKgmuzDQ8eR1ixyoI8wXRrQeO8ZtNPyuuKaeTPl+oHK9OdgGAcugWyLHFoxcFm4IL9MB1 IpnAOPlv/Hq3e6kO6zhlI/Q2b1A6MHja1zUiNN80YDtjc9gdFF3g6FHbygB4XR6SvnYGx0OdWI0nV ErhOVOKhK7ktKLccF+INUtnNKntKiVCPUhCecN3xgGJI73IDC0Br0Jp2h9alg7c2epyVDF9SP7Y5E RmLeJIF6IBnRSvCulbySf39JQ6Dx0+FFfP/nfTgwpKzT3/mvfapxyZxbuHudKOn28YkqjFIlzkWrU LbaTBUCQ==; Received: from i7.infradead.org ([2001:8b0:10b:1:21e:67ff:fecb:7a92]) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1mvRai-009loY-Uc; Thu, 09 Dec 2021 22:08:41 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1mvRaj-0003t5-53; Thu, 09 Dec 2021 22:08:41 +0000 From: David Woodhouse To: qemu-devel@nongnu.org Cc: "Michael S. Tsirkin" , Peter Xu , Jason Wang , Paolo Bonzini , Richard Henderson , Eduardo Habkost , Marcel Apfelbaum , Marcelo Tosatti , kvm@vger.kernel.org Subject: [PATCH v2 4/4] intel_iommu: Fix irqchip / X2APIC configuration checks Date: Thu, 9 Dec 2021 22:08:40 +0000 Message-Id: <20211209220840.14889-4-dwmw2@infradead.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211209220840.14889-1-dwmw2@infradead.org> References: <20211209220840.14889-1-dwmw2@infradead.org> MIME-Version: 1.0 Sender: David Woodhouse X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org We don't need to check kvm_enable_x2apic(). It's perfectly OK to support interrupt remapping even if we can't address CPUs above 254. Kind of pointless, but still functional. The check on kvm_enable_x2apic() needs to happen *anyway* in order to allow CPUs above 254 even without an IOMMU, so allow that to happen elsewhere. However, we do require the *split* irqchip in order to rewrite I/OAPIC destinations. So fix that check while we're here. Signed-off-by: David Woodhouse Reviewed-by: Peter Xu Acked-by: Jason Wang --- hw/i386/intel_iommu.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c index bd288d45bb..0d1c72f08e 100644 --- a/hw/i386/intel_iommu.c +++ b/hw/i386/intel_iommu.c @@ -3760,15 +3760,10 @@ static bool vtd_decide_config(IntelIOMMUState *s, Error **errp) ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF; } if (s->intr_eim == ON_OFF_AUTO_ON && !s->buggy_eim) { - if (!kvm_irqchip_in_kernel()) { + if (!kvm_irqchip_is_split()) { error_setg(errp, "eim=on requires accel=kvm,kernel-irqchip=split"); return false; } - if (!kvm_enable_x2apic()) { - error_setg(errp, "eim=on requires support on the KVM side" - "(X2APIC_API, first shipped in v4.7)"); - return false; - } } /* Currently only address widths supported are 39 and 48 bits */