From nobody Sat Oct 4 14:33:05 2025 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 495B7227B9F for ; Fri, 15 Aug 2025 13:03:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755262998; cv=none; b=OxELZQq9UZQ9VUM1UNstnfdfmLa19VaavAwVl6jh4njX1SBez8l47w1hL9DtAkuVEQZG4hQeYTD/I6HlCTX1o3+1lJJNopgXD/XC5jwLbKvdq1rf7l1lsiOsVqVtRqKlebEfdKVTfl7k+x2QAyzBNnSUY9rYU5jEeT8yBsaH92A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755262998; c=relaxed/simple; bh=uY1JxuyuoIe8Ptq4MuoTbN2U1FhZKUGuq4y4aLoFgRw=; h=Message-ID:Subject:From:To:Cc:Date:Content-Type:MIME-Version; b=CTja1JTdCX818hKw3s+wvDX7MTBK0OKkNwqbwGxZn6K3pOnzAOf5BubaH1YyjM/DmA5ztdDEpicfzGhho9uJotqRBXeGL+NBUGyy3RDyjlvinqikdNa3WAWzhfalc79ugQgm0k7VeigM/Rkv0th5ZV05LQdQzk35xoMdISggy5c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=vPTGM/KJ; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="vPTGM/KJ" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:Date:Cc:To: From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:In-Reply-To:References; bh=1IX5MNPHtqBATIp94aWDwleREjcXMLurVvtlUNz6gyA=; b=vPTGM/KJ0LBJ/6a5oQOQHX6RXK 3LDj514cTFF4ZA+d+8En8q2EOFEMnsbpaT55e0qjJKyu84spf8pehQ4w+Y5zrYl0SOTgpVwAVyIk6 ZIgDkY4nKwI363N4DuBbmMCA8gw7P4eL+dPrRFOPWEkpBIGXKMx5YgqoSb84nGCYgahECXWD7b/gz RrBaVtdxyiAai9CFYfr4hJkIM8S5fSL4UcAp6Ra5nGjy5/IUDtNK4sAuLCLUM2tHRsZtb5xa9Z89n CpUdNC4IMcuI+U6YFNYP4u8WThktQ2yisLtoejc3/9EejCj4JfWLKtAmRpt0HGMTKURDFWvfXn4mj b8DsD66g==; Received: from 54-240-197-234.amazon.com ([54.240.197.234] helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1umu5G-0000000D0mg-3cE7; Fri, 15 Aug 2025 13:03:03 +0000 Message-ID: Subject: [PATCH v3] x86/bhyve: Detect FreeBSD Bhyve hypervisor From: David Woodhouse To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , David Woodhouse , "Ahmed S. Darwish" , linux-kernel@vger.kernel.org Cc: Konstantin Belousov , John Baldwin , "" Date: Fri, 15 Aug 2025 14:03:02 +0100 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-0PCPsj/JNvPqGRcdQ+9E" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-0PCPsj/JNvPqGRcdQ+9E Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse This detects the Bhyve hypervisor and enables 15-bit MSI support if available. Detecting Bhyve used to be a purely cosmetic issue, of the kernel printing 'Hypervisor detected: Bhyve' at boot time. But FreeBSD 15.0 will support=C2=B9 the 15-bit MSI enlightenment to support more than 255 vCPUs (http://david.woodhou.se/ExtDestId.pdf) which means there's now actually some functional reason to do so. =C2=B9 https://github.com/freebsd/freebsd-src/commit/313a68ea20b4 Signed-off-by: David Woodhouse --- I still haven't been able to test this properly as I cannot persuade Bhyve to boot any guest at all. v3: =E2=80=A2 Drop the cpuid_level check =E2=80=A2 Define and use BHYVE_SIGNATURE =E2=80=A2 Use the actual definition of CPUID_BHYVE_FEATURES and logical OR instead of adding, as we do for other hypervisor leaves elsewhere =E2=80=A2 Fix bhyve_cpuid_max miscalculation mistake v2: =E2=80=A2 Make it optional with CONFIG_BHYVE_GUEST =E2=80=A2 Use cpu_feature_enabled() arch/x86/Kconfig | 9 +++++ arch/x86/include/asm/hypervisor.h | 2 + arch/x86/kernel/cpu/Makefile | 1 + arch/x86/kernel/cpu/bhyve.c | 63 +++++++++++++++++++++++++++++++ arch/x86/kernel/cpu/hypervisor.c | 3 ++ 5 files changed, 78 insertions(+) create mode 100644 arch/x86/kernel/cpu/bhyve.c diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 58d890fe2100..ac1c6df44212 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -879,6 +879,15 @@ config ACRN_GUEST IOT with small footprint and real-time features. More details can be found in https://projectacrn.org/. =20 +config BHYVE_GUEST + bool "Bhyve (BSD Hypervisor) Guest support" + depends on X86_64 + help + This option allows to run Linux to recognise when it is running as a + guest in the Bhyve hypervisor, and to support more than 255 vCPUs when + when doing so. More details about Bhyve can be found at https://bhyve.o= rg + and https://wiki.freebsd.org/bhyve/. + config INTEL_TDX_GUEST bool "Intel TDX (Trust Domain Extensions) - Guest Support" depends on X86_64 && CPU_SUP_INTEL diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hyper= visor.h index e41cbf2ec41d..9ad86a7d13f6 100644 --- a/arch/x86/include/asm/hypervisor.h +++ b/arch/x86/include/asm/hypervisor.h @@ -30,6 +30,7 @@ enum x86_hypervisor_type { X86_HYPER_KVM, X86_HYPER_JAILHOUSE, X86_HYPER_ACRN, + X86_HYPER_BHYVE, }; =20 #ifdef CONFIG_HYPERVISOR_GUEST @@ -64,6 +65,7 @@ extern const struct hypervisor_x86 x86_hyper_xen_pv; extern const struct hypervisor_x86 x86_hyper_kvm; extern const struct hypervisor_x86 x86_hyper_jailhouse; extern const struct hypervisor_x86 x86_hyper_acrn; +extern const struct hypervisor_x86 x86_hyper_bhyve; extern struct hypervisor_x86 x86_hyper_xen_hvm; =20 extern bool nopv; diff --git a/arch/x86/kernel/cpu/Makefile b/arch/x86/kernel/cpu/Makefile index 1e26179ff18c..2f8a58ef690e 100644 --- a/arch/x86/kernel/cpu/Makefile +++ b/arch/x86/kernel/cpu/Makefile @@ -58,6 +58,7 @@ obj-$(CONFIG_X86_SGX) +=3D sgx/ obj-$(CONFIG_X86_LOCAL_APIC) +=3D perfctr-watchdog.o =20 obj-$(CONFIG_HYPERVISOR_GUEST) +=3D vmware.o hypervisor.o mshyperv.o +obj-$(CONFIG_BHYVE_GUEST) +=3D bhyve.o obj-$(CONFIG_ACRN_GUEST) +=3D acrn.o =20 obj-$(CONFIG_DEBUG_FS) +=3D debugfs.o diff --git a/arch/x86/kernel/cpu/bhyve.c b/arch/x86/kernel/cpu/bhyve.c new file mode 100644 index 000000000000..a628482dd441 --- /dev/null +++ b/arch/x86/kernel/cpu/bhyve.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * FreeBSD Bhyve guest enlightenments + * + * Copyright =C2=A9 2025 Amazon.com, Inc. or its affiliates. + * + * Author: David Woodhouse + */ + +#include +#include +#include +#include + +static uint32_t bhyve_cpuid_base; +static uint32_t bhyve_cpuid_max; + +#define BHYVE_SIGNATURE "bhyve bhyve " + +#define CPUID_BHYVE_FEATURES 0x40000001 + +/* Features advertised in CPUID_BHYVE_FEATURES %eax */ +#define CPUID_BHYVE_FEAT_EXT_DEST_ID (1UL << 0) /* MSI Extended Dest ID */ + +static uint32_t __init bhyve_detect(void) +{ + if (!cpu_feature_enabled(X86_FEATURE_HYPERVISOR)) + return 0; + + bhyve_cpuid_base =3D cpuid_base_hypervisor(BHYVE_SIGNATURE, 0); + if (!bhyve_cpuid_base) + return 0; + + bhyve_cpuid_max =3D cpuid_eax(bhyve_cpuid_base); + return bhyve_cpuid_max; +} + +static uint32_t bhyve_features(void) +{ + if (bhyve_cpuid_max < bhyve_cpuid_base | CPUID_BHYVE_FEATURES) + return 0; + + return cpuid_eax(bhyve_cpuid_base | CPUID_BHYVE_FEATURES); +} + +static bool __init bhyve_ext_dest_id(void) +{ + return !!(bhyve_features() & CPUID_BHYVE_FEAT_EXT_DEST_ID); +} + +static bool __init bhyve_x2apic_available(void) +{ + /* Bhyve has always supported x2apic */ + return true; +} + +const struct hypervisor_x86 x86_hyper_bhyve __refconst =3D { + .name =3D "Bhyve", + .detect =3D bhyve_detect, + .init.init_platform =3D x86_init_noop, + .init.x2apic_available =3D bhyve_x2apic_available, + .init.msi_ext_dest_id =3D bhyve_ext_dest_id, +}; diff --git a/arch/x86/kernel/cpu/hypervisor.c b/arch/x86/kernel/cpu/hypervi= sor.c index 553bfbfc3a1b..f3e9219845e8 100644 --- a/arch/x86/kernel/cpu/hypervisor.c +++ b/arch/x86/kernel/cpu/hypervisor.c @@ -45,6 +45,9 @@ static const __initconst struct hypervisor_x86 * const hy= pervisors[] =3D #ifdef CONFIG_ACRN_GUEST &x86_hyper_acrn, #endif +#ifdef CONFIG_BHYVE_GUEST + &x86_hyper_bhyve, +#endif }; =20 enum x86_hypervisor_type x86_hyper_type; --=20 2.49.0 --=-0PCPsj/JNvPqGRcdQ+9E Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi 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