From nobody Thu Apr 16 15:04:34 2026 X-Original-To: dev-commits-src-branches@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4fxLrz1NbDz6ZnpT for ; Thu, 16 Apr 2026 15:04:35 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R12" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4fxLry5sP2z4JDY for ; Thu, 16 Apr 2026 15:04:34 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1776351874; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=0fKsLqIlO4UlRW591QuWid/EXD1t/zkydiCtlcm64Y8=; b=hzgvm7ny5qz4JOr9VXOaAgor0tkJaIyAurTeQHBTNwwiUcH5ssIUoYjO28lvu7FqjGHr4F WfuwHJuqOLW2ONuCicblT9/CBvyzZh8a6zv3zITRoJzifAzYs60Wi8IsD3xuaEl+C6yxjP xqVLqmjQTY01MYhfJCXRQVWqmXMX1oqaZFYBxYAuC5OcElyG6uwy1DTmVJUI/4GQ+HEwDC UrFl+2BdesU/CUsyDEQ3xfmAxlZEf9lHKR/ocB1sjxE+0oGwCWBHrSV5piFEs8MEiJ5F3g 8dqNGch/+CPpvknT+u74Ipr3Xdp63yWSBdIUbdWJZyGvqmrTNIlUJzq0QKmGXw== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1776351874; a=rsa-sha256; cv=none; b=srWEzQflo3BHD+egTucPYNlftrNuKLF+vcpugiVqvE894p3n9xdSpxoG6vR19CxH/ZL6kx T6T87OkI3JrFNyuciennfdVOgQbGQX40j+RnUeYD6yVJ7Bg0wa2UVTeruHm1vQOwNrhAl7 DA2RwxNu/PdV+Hy4TsemaSvBdlZOl11RwVG6+7eZDCQ+seOMF8nIR1QZqd3ewTuQK0LbZh eSsaMhD+RgpUVQhK3dx1B1KfgMF8Tn1p5U/McaNI433vzBrePiQ3R4phkw2sfTRK0gav+z GG0WFC0XRth5d/RrGgmetXc/F9iZ7QqnmNSW1v6bC0hrY5F6eVtRFXLLwwT1Kw== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1776351874; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=0fKsLqIlO4UlRW591QuWid/EXD1t/zkydiCtlcm64Y8=; b=s97rsCzfy4KiCJX5b2L6/wj6eyyIhuVDpAw0YG5YmipYr8LLIfM26QgHmm3ee9C4FNxd/x ZJrEajO81zD2iCt2GGDS+jQwlasAixWuPEbAeYwLAzsLTg7QjID9BrwMMk2qJqeaWEh9qG pDk/odqzHLXzxS+vWGimjXojO9Yuqw+w4AFMEXVZSgsvuqA25KWl/9p1XE5v6dNMworPgG oTbIM8K65fByhLRrG9Mr86gitQaYFiZPzyy9tvmJnB1F+lKqC55uSQxmA0No0dLLUC8LVz eNPV9zi8n2CtYnf6NWW70rFTK3XRS0ZYye1JFEGef9UgBz9HXWRbzDwELtTH0Q== Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) by mxrelay.nyi.freebsd.org (Postfix) with ESMTP id 4fxLry5Pw3z1BB8 for ; Thu, 16 Apr 2026 15:04:34 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from git (uid 1279) (envelope-from git@FreeBSD.org) id 1d033 by gitrepo.freebsd.org (DragonFly Mail Agent v0.13+ on gitrepo.freebsd.org); Thu, 16 Apr 2026 15:04:34 +0000 To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Colin Percival Subject: git: c7d6c74fb89b - stable/15 - Hyper-V: Detect Extended Destination ID support List-Id: Commits to the stable branches of the FreeBSD src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-branches List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-branches@freebsd.org Sender: owner-dev-commits-src-branches@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: cperciva X-Git-Repository: src X-Git-Refname: refs/heads/stable/15 X-Git-Reftype: branch X-Git-Commit: c7d6c74fb89bf04c541ca1144d3c78392d1603b6 Auto-Submitted: auto-generated Date: Thu, 16 Apr 2026 15:04:34 +0000 Message-Id: <69e0fa82.1d033.75e58b57@gitrepo.freebsd.org> The branch stable/15 has been updated by cperciva: URL: https://cgit.FreeBSD.org/src/commit/?id=c7d6c74fb89bf04c541ca1144d3c78392d1603b6 commit c7d6c74fb89bf04c541ca1144d3c78392d1603b6 Author: Colin Percival AuthorDate: 2026-02-22 04:09:01 +0000 Commit: Colin Percival CommitDate: 2026-04-16 15:04:00 +0000 Hyper-V: Detect Extended Destination ID support Hyper-V advertises support for the Extended Destination ID standard via bit 2 of the value returned in the EAX register when the hypervisor stack properties are queried via CPUID. This is based on a commit to the Linux kernel, as there does not seem to be any other documentation of this feature. Reviewed by: Souradeep Chakrabarti MFC after: 3 weeks Sponsored by: Amazon Differential Revision: https://reviews.freebsd.org/D55432 (cherry picked from commit 7b6be0014a4eb81943491122bae70914b7fd82b6) --- sys/dev/hyperv/vmbus/x86/hyperv_reg.h | 6 ++++++ sys/x86/x86/local_apic.c | 9 +++++++++ 2 files changed, 15 insertions(+) diff --git a/sys/dev/hyperv/vmbus/x86/hyperv_reg.h b/sys/dev/hyperv/vmbus/x86/hyperv_reg.h index 0597a1fea953..e7560d00f25e 100644 --- a/sys/dev/hyperv/vmbus/x86/hyperv_reg.h +++ b/sys/dev/hyperv/vmbus/x86/hyperv_reg.h @@ -45,4 +45,10 @@ #define CPUID_LEAF_HV_IDENTITY 0x40000002 #define CPUID_LEAF_HV_FEATURES 0x40000003 #define CPUID_LEAF_HV_RECOMMENDS 0x40000004 + +#define CPUID_LEAF_HV_STACK_INTERFACE 0x40000081 +#define HYPERV_STACK_INTERFACE_EAX_SIG 0x31235356 /* "VS#1" */ +#define CPUID_LEAF_HV_STACK_PROPERTIES 0x40000082 +#define HYPERV_PROPERTIES_EXT_DEST_ID 0x00000004 + #endif /* !_HYPERV_REG_H_ */ diff --git a/sys/x86/x86/local_apic.c b/sys/x86/x86/local_apic.c index 922809b38d78..c7a967067e0d 100644 --- a/sys/x86/x86/local_apic.c +++ b/sys/x86/x86/local_apic.c @@ -75,6 +75,7 @@ #include #include #include +#include #ifdef DDB #include @@ -2088,6 +2089,14 @@ detect_extended_dest_id(void) if (regs[0] & XEN_HVM_CPUID_EXT_DEST_ID) apic_ext_dest_id = 1; break; + case VM_GUEST_HV: + cpuid_count(CPUID_LEAF_HV_STACK_INTERFACE, 0, regs); + if (regs[0] != HYPERV_STACK_INTERFACE_EAX_SIG) + break; + cpuid_count(CPUID_LEAF_HV_STACK_PROPERTIES, 0, regs); + if (regs[0] & HYPERV_PROPERTIES_EXT_DEST_ID) + apic_ext_dest_id = 1; + break; case VM_GUEST_KVM: kvm_cpuid_get_features(regs); if (regs[0] & KVM_FEATURE_MSI_EXT_DEST_ID)