From mboxrd@z Thu Jan 1 00:00:00 1970 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 B77222FD7B1 for ; Wed, 13 Aug 2025 21:07:30 +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=1755119253; cv=none; b=OdBhNcN004b5a2g0X4gkm5xLzaEOrYMO+ZCeCqTV7wQ5JiqTwL08jnXPHy63jwih0Z060J5s7pFID+aCC/vDayPk4RnlDJFi3MqBCJCUtFneHKqWQiowAR/AVLCb+dRT90UYZLBrTZUS0UYDOhGEJeP9qoGUdGmCMI9LXGoaWfA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755119253; c=relaxed/simple; bh=2/upge2kkWDE6h2AuDiq31SN5x71fIeSAxhfn9FsXMM=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=ly7tPro8NPNPXlq0pJGPLUa7uVXzf16ASoyKl4rrSJ38WVLYCkKemFxe4p2Uj4p6UPFKTkBg3Aj7rzDPzhKDaP4IV8cCiZEznKuP3aV2bLm/ipwmjRnfTXMDqqs5sg66r6HAxViqPww1xL59DcyaUOta2v1jZMycNtbbOwBOvfQ= 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=QIOvhrCW; 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="QIOvhrCW" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=ZyS957QEdf6Ue9l9vQwrxoGeZt6SyH/sLLVEmyJht3Q=; b=QIOvhrCWnyip8d2nqmnVahcp1Q LKmDip9pc4pTZzqSVSiXJYOOF6Jx+C8E1tLJVj/3AzteodWVqPIr+grZKN28I1Ft7pdDQnxgUEDF6 bQIWkkDiqjA8FOUVvaxn3A7WTHorZLx4ndpEHAOCREYTQaDzj67nWOZ1KvvNT3+pdy7Wc7Buintd/ FuysglRAstMYbtn4W5xr1dUpFel5fEHDVSaftxDfv39+gAt47SqHa9rBH9F6nEOggzBOx93XksGtz wH7uriy+tSM/pBb3/GLnMX+mmm5hYnNNBTYaRXPjNLw0QIhpaJubdWxIlRJ+ydTgQVGg6b93dFRWL Ld5KRoJA==; Received: from 54-240-197-231.amazon.com ([54.240.197.231] helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1umIgt-0000000C8bC-05K7; Wed, 13 Aug 2025 21:07:23 +0000 Message-ID: <76fab40c181f671e5505e29c7ca920f4eee4dd5d.camel@infradead.org> Subject: Re: [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" , "Ahmed S. Darwish" , linux-kernel@vger.kernel.org Cc: Konstantin Belousov , John Baldwin , Colin Percival Date: Wed, 13 Aug 2025 23:07:22 +0200 In-Reply-To: <98dd43553b2d63edd3d994816f378985d1a19d72.camel@infradead.org> References: <98dd43553b2d63edd3d994816f378985d1a19d72.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-mIWI9yZdmGEK+mOQkxeh" 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 --=-mIWI9yZdmGEK+mOQkxeh Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2025-08-11 at 13:16 +0200, David Woodhouse wrote: > From: David Woodhouse >=20 > This detects the Bhyve hypervisor and enables 15-bit MSI support if > available. >=20 > 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=C2=A0and not yet merged. > And because I haven't tested this patch at all other than building it. Now merged and should be in FreeBSD 15.0 release. Thanks, Colin! https://github.com/freebsd/freebsd-src/commit/4322d597453d6 > It's tiny so I didn't put it behind a separate CONFIG_BHYVE_GUEST. > Should I? >=20 > =C2=A0arch/x86/include/asm/hypervisor.h |=C2=A0 2 + > =C2=A0arch/x86/kernel/cpu/Makefile=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 |=C2=A0 = 2 +- > =C2=A0arch/x86/kernel/cpu/bhyve.c=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 | 6= 2 +++++++++++++++++++++++++++++++ > =C2=A0arch/x86/kernel/cpu/hypervisor.c=C2=A0 |=C2=A0 1 + > =C2=A04 files changed, 66 insertions(+), 1 deletion(-) > =C2=A0create mode 100644 arch/x86/kernel/cpu/bhyve.c >=20 > diff --git a/arch/x86/include/asm/hypervisor.h b/arch/x86/include/asm/hyp= ervisor.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 { > =C2=A0 X86_HYPER_KVM, > =C2=A0 X86_HYPER_JAILHOUSE, > =C2=A0 X86_HYPER_ACRN, > + X86_HYPER_BHYVE, > =C2=A0}; > =C2=A0 > =C2=A0#ifdef CONFIG_HYPERVISOR_GUEST > @@ -64,6 +65,7 @@ extern const struct hypervisor_x86 x86_hyper_xen_pv; > =C2=A0extern const struct hypervisor_x86 x86_hyper_kvm; > =C2=A0extern const struct hypervisor_x86 x86_hyper_jailhouse; > =C2=A0extern const struct hypervisor_x86 x86_hyper_acrn; > +extern const struct hypervisor_x86 x86_hyper_bhyve; > =C2=A0extern struct hypervisor_x86 x86_hyper_xen_hvm; > =C2=A0 > =C2=A0extern 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-$(CONFIG_X86_SGX) +=3D sgx/ > =C2=A0 > =C2=A0obj-$(CONFIG_X86_LOCAL_APIC) +=3D perfctr-watchdog.o > =C2=A0 > -obj-$(CONFIG_HYPERVISOR_GUEST) +=3D vmware.o hypervisor.o mshyperv.o > +obj-$(CONFIG_HYPERVISOR_GUEST) +=3D vmware.o hypervisor.o mshyperv.o bh= yve.o > =C2=A0obj-$(CONFIG_ACRN_GUEST) +=3D acrn.o > =C2=A0 > =C2=A0obj-$(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 || > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 !boot= _cpu_has(X86_FEATURE_HYPERVISOR)) > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0 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 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