From nobody Sat Mar 28 05:56:37 2026 X-Original-To: dev-commits-src-all@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 4fjRbV0rY7z6XbLl for ; Sat, 28 Mar 2026 05:56:38 +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 4fjRbT5Schz3qwT for ; Sat, 28 Mar 2026 05:56:37 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1774677397; 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=XV0pyMuZlI3LL5hBYU8EthoBEHHNweJzTScr0nC904E=; b=VC2HsXJxQIzjbmY6XQKdJUQNJd+8YVilGQ/88+GLp5pTreRhgNHig1bds2OSguNDFJqt/S AdJ051mP5HEfpQKvr8KcFN8LRG1zjDAokA3e58crjWlVAFDVh936cmqNcd7fcXQmag61k/ YOhyti9EnOVbnE+lheEQYSjpdiETpe79lM2Gd2cGr9Zh/U0K0jUY5mEuBHTmlmZWOBCTCn iIi5dZiTN5WpbxIayYUObK88oHslZ16rj1/DXvwFdGwvfQ2/AhVXzeMvMIE3GslW3HHLYp QOK3yEPKsJubuSLaxXcA/9LKJ07CjmXkUUA/dfZ7W69uVWpTkZ7qMvvbolhN7Q== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1774677397; a=rsa-sha256; cv=none; b=VZ48zcxfMqhFl4as8SsRIWC/EH4ADmnq4xJ6CtZXQYix+V4qGJqkHd1NkjUvNcUX+Jjj3F RhSMGbPjcx2U8ln7/CazeQM/cXDKQFRbms/J8EdM2D9yq6WPHiZiseKI1/zIJbPZbYMAHV lJEA4b21iG3DbApP8HhtkmoB1X4LItOn2ngXRcWNsXerWWxgu8S4vf8UrfZayuvCS09eRD y3Npd69EQkuxjtV93YceRAn3/EtLjePzTeBzEwiqOe3+jy3FfVvjILda2uIpf1zqM4A3rf jWSJccD0uXt2XScJfLX6I01x9Q624B9M67iaYD6TyEYwVBw7TLBeufJW0ukfXA== 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=1774677397; 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=XV0pyMuZlI3LL5hBYU8EthoBEHHNweJzTScr0nC904E=; b=jmy+Ve/dvTSqJnLYZAt5CcG5oKmMNrs7OJ0ZLZmyjIJcYLPym8rPVRTc5bZJdtC/rlmcLd NsfdzQv4B0AYSFMfAqFRQAHXGiZOyrJ/3Jx+6LjCWH/f9hNpi68Q8UIi8MeEaFpqttZdHp yUl2t7Twqbw0jvPC/oMTPGt1YWjhPqG7Y27itwY+cIBm/jmVx2OoFRUT4+YbRxYxVH56a6 MuePBmWmPxIzXDYjD43NzBe5NL6wyppceK5n0TVbOoSEvw4rQQDMow9d5dHlpORRgOaDSy k+fUw8h6DyRsskb39GWuXmp0aWuJk5oiW5X0XKPvjWBGU4Y4f8i8P2utLRd+mw== Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) by mxrelay.nyi.freebsd.org (Postfix) with ESMTP id 4fjRbT4WDnz1C1G for ; Sat, 28 Mar 2026 05:56:37 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from git (uid 1279) (envelope-from git@FreeBSD.org) id 4100b by gitrepo.freebsd.org (DragonFly Mail Agent v0.13+ on gitrepo.freebsd.org); Sat, 28 Mar 2026 05:56:37 +0000 To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Colin Percival Subject: git: 7b6be0014a4e - main - Hyper-V: Detect Extended Destination ID support List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-all@freebsd.org Sender: owner-dev-commits-src-all@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/main X-Git-Reftype: branch X-Git-Commit: 7b6be0014a4eb81943491122bae70914b7fd82b6 Auto-Submitted: auto-generated Date: Sat, 28 Mar 2026 05:56:37 +0000 Message-Id: <69c76d95.4100b.d90ba62@gitrepo.freebsd.org> The branch main has been updated by cperciva: URL: https://cgit.FreeBSD.org/src/commit/?id=7b6be0014a4eb81943491122bae70914b7fd82b6 commit 7b6be0014a4eb81943491122bae70914b7fd82b6 Author: Colin Percival AuthorDate: 2026-02-22 04:09:01 +0000 Commit: Colin Percival CommitDate: 2026-03-28 05:54:59 +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 --- 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 20f095a13574..cd5e4d474080 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 @@ -2107,6 +2108,14 @@ 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)