From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B35ADC00449 for ; Fri, 5 Oct 2018 05:10:18 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C39F320875 for ; Fri, 5 Oct 2018 05:10:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=gibson.dropbear.id.au header.i=@gibson.dropbear.id.au header.b="GPvXdNwZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C39F320875 Authentication-Results: mail.kernel.org; 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dmarc=none (p=none dis=none) header.from=gibson.dropbear.id.au Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=gibson.dropbear.id.au header.i=@gibson.dropbear.id.au header.b="GPvXdNwZ"; dkim-atps=neutral Received: by ozlabs.org (Postfix) id 42RGjW5lB6z9shy; Fri, 5 Oct 2018 14:19:11 +1000 (AEST) Received: by ozlabs.org (Postfix, from userid 1007) id 42RGjW4zLVz9s3T; Fri, 5 Oct 2018 14:19:11 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gibson.dropbear.id.au; s=201602; t=1538713151; bh=lZJttgWtPQ+MQ+RBZSofKM8TWu4KpYPxPKfPzlW8/10=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=GPvXdNwZxF+dIJLGQ6m/2nbFiNtNCiixVjHgphvmrTQ0/sor8+A7qAn495koh8ik0 B6bTk5m1c5u4fzxv58Sgp1LbM3VOIPerrXgYxNH5pfTdH2B9oNOcY+RUYGjGZ1FhpW y1/vUZXlm3Klur1fbWeJmeQ8JWxmNv9wMby0Fpxs= Date: Fri, 5 Oct 2018 13:05:49 +1000 From: David Gibson To: Paul Mackerras Subject: Re: [PATCH v3 30/33] KVM: PPC: Book3S HV: Allow HV module to load without hypervisor mode Message-ID: <20181005030549.GB13763@umbus.fritz.box> References: <1538479892-14835-1-git-send-email-paulus@ozlabs.org> <1538479892-14835-31-git-send-email-paulus@ozlabs.org> <20181003061514.GW1886@umbus.fritz.box> <20181004030321.GA16300@fergus> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="kXdP64Ggrk/fb43R" Content-Disposition: inline In-Reply-To: <20181004030321.GA16300@fergus> User-Agent: Mutt/1.10.1 (2018-07-13) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@ozlabs.org, kvm-ppc@vger.kernel.org, kvm@vger.kernel.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" --kXdP64Ggrk/fb43R Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Oct 04, 2018 at 01:03:21PM +1000, Paul Mackerras wrote: > On Wed, Oct 03, 2018 at 04:15:15PM +1000, David Gibson wrote: > > On Tue, Oct 02, 2018 at 09:31:29PM +1000, Paul Mackerras wrote: > > > With this, the KVM-HV module can be loaded in a guest running under > > > KVM-HV, and if the hypervisor supports nested virtualization, this > > > guest can now act as a nested hypervisor and run nested guests. > > >=20 > > > This also adds some checks to inform userspace that HPT guests are not > > > supported by nested hypervisors, and to prevent userspace from > > > configuring a guest to use HPT mode. > > >=20 > > > Signed-off-by: Paul Mackerras > > > --- > > > arch/powerpc/kvm/book3s_hv.c | 20 ++++++++++++++++---- > > > 1 file changed, 16 insertions(+), 4 deletions(-) > > >=20 > > > diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_h= v.c > > > index f630e91..196bff1 100644 > > > --- a/arch/powerpc/kvm/book3s_hv.c > > > +++ b/arch/powerpc/kvm/book3s_hv.c > > > @@ -4237,6 +4237,10 @@ static int kvm_vm_ioctl_get_smmu_info_hv(struc= t kvm *kvm, > > > { > > > struct kvm_ppc_one_seg_page_size *sps; > > > =20 > > > + /* If we're a nested hypervisor, we only support radix guests */ > > > + if (kvmhv_on_pseries()) > > > + return -EINVAL; > > > + > > > /* > > > * POWER7, POWER8 and POWER9 all support 32 storage keys for data. > > > * POWER7 doesn't support keys for instruction accesses, > > > @@ -4822,11 +4826,15 @@ static int kvmppc_core_emulate_mfspr_hv(struc= t kvm_vcpu *vcpu, int sprn, > > > =20 > > > static int kvmppc_core_check_processor_compat_hv(void) > > > { > > > - if (!cpu_has_feature(CPU_FTR_HVMODE) || > > > - !cpu_has_feature(CPU_FTR_ARCH_206)) > > > - return -EIO; > > > + if (cpu_has_feature(CPU_FTR_HVMODE) && > > > + cpu_has_feature(CPU_FTR_ARCH_206)) > > > + return 0; > > > =20 > > > - return 0; > > > + /* Can run as nested hypervisor on POWER9 in radix mode. */ > > > + if (cpu_has_feature(CPU_FTR_ARCH_300) && radix_enabled()) > >=20 > > Shouldn't we probe the parent hypervisor for ability to support nested > > guests before we say "yes" here? >=20 > Well, we do check that the parent hypervisor can support nested > hypervisors, it's just done later on. And to match nitpick with > nitpick, this is a function evaluating _processor_ compatibility, and > a POWER9 processor in radix mode does have everything necessary to > support nested hypervisors -- if the parent hypervisor doesn't support > nested hypervisors, that's not a deficiency in the processor. Fair enough. --=20 David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. 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