From patchwork Fri Oct 9 10:46:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Woodhouse X-Patchwork-Id: 11825575 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id EBFA36CA for ; Fri, 9 Oct 2020 10:46:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C393022277 for ; Fri, 9 Oct 2020 10:46:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="rR69r17f" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387836AbgJIKqb (ORCPT ); Fri, 9 Oct 2020 06:46:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47012 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387786AbgJIKq0 (ORCPT ); Fri, 9 Oct 2020 06:46:26 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2DDC9C0613D8; Fri, 9 Oct 2020 03:46:26 -0700 (PDT) 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=Y7hX4CMOL2NxcxTbKTC0sEPMs6ptoPSjwtvMLF2dqqU=; b=rR69r17f2NQGqPQJmIblGD4ino vxUBUAOQfzpTfcb4lcmYrDD7Usp+eHQ+pQTaatzu5xuD9w6BL4QEtOHDWTRqq2DXv71N+iw9gtlkq Pdq+MhMlTekNQZd8A7v7SzhmZ/jOpwSk3Ec/XqK7TAiTWHkTq9a4JdKxk/1nql/BuSoGbuP+iPvmM AinqGUYVT9tSSHwLDxlg1yadv2XQ3SJg7cqdg6FbXgEYHwy0QskUaoMoSJ9RtgAC4s3lDkQNRV7in JSqIImIgb+X4bMkJizwH1Jrl+WUkTUkdrxSycIW7MS9TrMhRGX8IxRbib6T3oajUC29i/rEJ7brXF vvNbH/eA==; Received: from i7.infradead.org ([2001:8b0:10b:1:21e:67ff:fecb:7a92]) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kQpup-0000js-Iy; Fri, 09 Oct 2020 10:46:23 +0000 Received: from dwoodhou by i7.infradead.org with local (Exim 4.93 #3 (Red Hat Linux)) id 1kQpup-005W4J-59; Fri, 09 Oct 2020 11:46:23 +0100 From: David Woodhouse To: x86@kernel.org Cc: kvm , Thomas Gleixner , Paolo Bonzini , linux-kernel , linux-hyperv@vger.kernel.org Subject: [PATCH v2 6/8] x86/kvm: Add KVM_FEATURE_MSI_EXT_DEST_ID Date: Fri, 9 Oct 2020 11:46:14 +0100 Message-Id: <20201009104616.1314746-7-dwmw2@infradead.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201009104616.1314746-1-dwmw2@infradead.org> References: <803bb6b2212e65c568c84ff6882c2aa8a0ee03d5.camel@infradead.org> <20201009104616.1314746-1-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 This allows the host to indicate that MSI emulation supports 15-bit destination IDs, allowing up to 32768 CPUs without interrupt remapping. cf. https://patchwork.kernel.org/patch/11816693/ for qemu Signed-off-by: David Woodhouse Acked-by: Paolo Bonzini --- Documentation/virt/kvm/cpuid.rst | 4 ++++ arch/x86/include/uapi/asm/kvm_para.h | 1 + arch/x86/kernel/kvm.c | 6 ++++++ 3 files changed, 11 insertions(+) diff --git a/Documentation/virt/kvm/cpuid.rst b/Documentation/virt/kvm/cpuid.rst index a7dff9186bed..1726b5925d2b 100644 --- a/Documentation/virt/kvm/cpuid.rst +++ b/Documentation/virt/kvm/cpuid.rst @@ -92,6 +92,10 @@ KVM_FEATURE_ASYNC_PF_INT 14 guest checks this feature bit async pf acknowledgment msr 0x4b564d07. +KVM_FEATURE_MSI_EXT_DEST_ID 15 guest checks this feature bit + before using extended destination + ID bits in MSI address bits 11-5. + KVM_FEATURE_CLOCSOURCE_STABLE_BIT 24 host will warn if no guest-side per-cpu warps are expeced in kvmclock diff --git a/arch/x86/include/uapi/asm/kvm_para.h b/arch/x86/include/uapi/asm/kvm_para.h index 812e9b4c1114..950afebfba88 100644 --- a/arch/x86/include/uapi/asm/kvm_para.h +++ b/arch/x86/include/uapi/asm/kvm_para.h @@ -32,6 +32,7 @@ #define KVM_FEATURE_POLL_CONTROL 12 #define KVM_FEATURE_PV_SCHED_YIELD 13 #define KVM_FEATURE_ASYNC_PF_INT 14 +#define KVM_FEATURE_MSI_EXT_DEST_ID 15 #define KVM_HINTS_REALTIME 0 diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 1b51b727b140..4986b4399aef 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -743,12 +743,18 @@ static void __init kvm_init_platform(void) x86_platform.apic_post_init = kvm_apic_init; } +static bool __init kvm_msi_ext_dest_id(void) +{ + return kvm_para_has_feature(KVM_FEATURE_MSI_EXT_DEST_ID); +} + const __initconst struct hypervisor_x86 x86_hyper_kvm = { .name = "KVM", .detect = kvm_detect, .type = X86_HYPER_KVM, .init.guest_late_init = kvm_guest_init, .init.x2apic_available = kvm_para_available, + .init.msi_ext_dest_id = kvm_msi_ext_dest_id, .init.init_platform = kvm_init_platform, };