From nobody Sun Oct 5 01:45:07 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 DCDDE20DD4D for ; Mon, 11 Aug 2025 11:16:55 +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=1754911018; cv=none; b=Zq+PrOCEncD0qFJwbxi6X+ShYw67VRSn4i/uA0qBZnIEqyujsH0okBXaReHK30qa+0Wl5zk4YA+1+GqW4YMyTQRY9YahZoc7KN1yIq9kMhA8xnaVMsLYcfiKQXcDYN+zLgofXmNHdSy8oXbrgTgH4jhe0ZUVX2REOhYWTRgYUPw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754911018; c=relaxed/simple; bh=fVZLP2Zj4ccR6/cCGHppFuE/fV/LboeSr7GALEvFaCQ=; h=Message-ID:Subject:From:To:Cc:Date:Content-Type:MIME-Version; b=GU1RYCWmIGm5ejsXgOFoKhwkk++urDpANUwMmVfkpo73OmCGTXKpWn8prVaRFasHChs+hbsagpUgGFLZusV7GOkXXJfZUYNuxvKVpIyhvLtc5TXQfRiF5+h2Jt+CakLbWwaUkdf0kuoQ7vFFBQVZLIah+FmQD/bHV8QieHTcWg4= 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=ie2Ki29U; 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="ie2Ki29U" 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=YKW7bBIKX6ZuJ6HUUMQ9KJeDqD0jx0+jAw3RBOFJvcc=; b=ie2Ki29Unx89ymvVOkrrrW8NRQ stor4kcy9yLikRKW3xdqsmSYcXAslq1/ya20Rd9hQ/8qhKp0ZlqAIvBQ9H95IFOv8LOIASOXZZJVF Z6VOxFRTNWcA8CO3MoARAMFDNO8sz+l3vaeezqf4CYjA8zHP9qx1VA0coOqGGspZVIkiRn4sytM5E bxZd8HcunuZMo4XBH3MfpqHxo1jAnVxpOTyAPXzh9sR8GO817ZQdChccKDN9tSnh/OkQjW7b+Gq7D YuuzKBFM9RaL8vWlB8cRhnzSvUgsNo/2mQgrVQW1R9EqFDGVkE/YhaULPl0aKG6fUaEHebfax+/ti iHfOVCLg==; Received: from [54.239.6.186] (helo=freeip.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1ulQWA-00000004alF-35a3; Mon, 11 Aug 2025 11:16:43 +0000 Message-ID: <98dd43553b2d63edd3d994816f378985d1a19d72.camel@infradead.org> Subject: [RFC PATCH] 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: Mon, 11 Aug 2025 13:16:42 +0200 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-aDAhUdYX9XhUP2oJ3Mys" 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 --=-aDAhUdYX9XhUP2oJ3Mys 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. Signed-off-by: David Woodhouse --- RFC because the CPUID_BHYVE_FEATURES leaf is submitted to FreeBSD in https://github.com/freebsd/freebsd-src/pull/1797 and not yet merged. And because I haven't tested this patch at all other than building it. It's tiny so I didn't put it behind a separate CONFIG_BHYVE_GUEST. Should I? arch/x86/include/asm/hypervisor.h | 2 + arch/x86/kernel/cpu/Makefile | 2 +- arch/x86/kernel/cpu/bhyve.c | 62 +++++++++++++++++++++++++++++++ arch/x86/kernel/cpu/hypervisor.c | 1 + 4 files changed, 66 insertions(+), 1 deletion(-) create mode 100644 arch/x86/kernel/cpu/bhyve.c 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..d4cb04edbacf 100644 --- a/arch/x86/kernel/cpu/Makefile +++ b/arch/x86/kernel/cpu/Makefile @@ -57,7 +57,7 @@ obj-$(CONFIG_X86_SGX) +=3D sgx/ =20 obj-$(CONFIG_X86_LOCAL_APIC) +=3D perfctr-watchdog.o =20 -obj-$(CONFIG_HYPERVISOR_GUEST) +=3D vmware.o hypervisor.o mshyperv.o +obj-$(CONFIG_HYPERVISOR_GUEST) +=3D vmware.o hypervisor.o mshyperv.o bhyv= e.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..6d8d6ba458ef --- /dev/null +++ b/arch/x86/kernel/cpu/bhyve.c @@ -0,0 +1,62 @@ +// 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 CPUID_BHYVE_FEATURES 1 + +/* 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 (boot_cpu_data.cpuid_level < 0 || + !boot_cpu_has(X86_FEATURE_HYPERVISOR)) + return 0; + + bhyve_cpuid_base =3D cpuid_base_hypervisor("bhyve bhyve ", 0); + if (!bhyve_cpuid_base) + return 0; + + bhyve_cpuid_max =3D cpuid_eax(bhyve_cpuid_max); + 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..157cf9edeb35 100644 --- a/arch/x86/kernel/cpu/hypervisor.c +++ b/arch/x86/kernel/cpu/hypervisor.c @@ -36,6 +36,7 @@ static const __initconst struct hypervisor_x86 * const hy= pervisors[] =3D #endif &x86_hyper_vmware, &x86_hyper_ms_hyperv, + &x86_hyper_bhyve, #ifdef CONFIG_KVM_GUEST &x86_hyper_kvm, #endif --=20 2.49.0 --=-aDAhUdYX9XhUP2oJ3Mys Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT 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