From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 D0CC222319; Thu, 23 Nov 2023 16:44:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="m4ee7bnI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3091DC433C8; Thu, 23 Nov 2023 16:44:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700757877; bh=QE1UBMJM5H60d9fEa4rL89oCeBbt8rlDAZb/2FhqlaI=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=m4ee7bnIn5Ijb6AndVKhEJr0ZWivopONg7hEb3TVLchy9JvnoWRQmHF8sLs3sY6QP NMvfo7239wYRLGCUsvaZNvxlY+oPtLiAKeDuI402UgA4mw4nloF5giDLIgOCH8wA3s Cen5lMU3swZjwdci+3HCPCYle8mm90QX51n+hBipNPCzxxl8x6fAgOVDuYn3pL0+gh wEL1K8e+1m3bnoJdIB/xFMae1/EFMKY3Ew7RHdl32PduRffruoziXSWYgRkhfyfSci zaWptwUBsl8fmx+R76L9bNkv3o5fi4nuYLFljWZof1IBUjwOgNkCmwnx6ZWM/8S1Pb jkAMXBTAqi1nw== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1r6Coc-00Fpyj-Fa; Thu, 23 Nov 2023 16:44:34 +0000 Date: Thu, 23 Nov 2023 16:44:34 +0000 Message-ID: <86a5r4zafh.wl-maz@kernel.org> From: Marc Zyngier To: Miguel Luis Cc: "kvmarm@lists.linux.dev" , "kvm@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Alexandru Elisei , Andre Przywara , Chase Conklin , Christoffer Dall , Ganapatrao Kulkarni , Darren Hart , Jintack Lim , Russell King , James Morse , Suzuki K Poulose , Oliver Upton , Zenghui Yu Subject: Re: [PATCH v11 00/43] KVM: arm64: Nested Virtualization support (FEAT_NV2 only) In-Reply-To: <05733774-4210-4097-9912-fb3aa8542fdd@oracle.com> References: <20231120131027.854038-1-maz@kernel.org> <86msv7ylnu.wl-maz@kernel.org> <05733774-4210-4097-9912-fb3aa8542fdd@oracle.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/29.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: miguel.luis@oracle.com, kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, alexandru.elisei@arm.com, andre.przywara@arm.com, chase.conklin@arm.com, christoffer.dall@arm.com, gankulkarni@os.amperecomputing.com, darren@os.amperecomputing.com, jintack@cs.columbia.edu, rmk+kernel@armlinux.org.uk, james.morse@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Thu, 23 Nov 2023 16:21:48 +0000, Miguel Luis wrote: >=20 > Hi Marc, >=20 > On 21/11/2023 18:02, Marc Zyngier wrote: > > On Tue, 21 Nov 2023 16:49:52 +0000, > > Miguel Luis wrote: > >> Hi Marc, > >> > >>> On 20 Nov 2023, at 12:09, Marc Zyngier wrote: > >>> > >>> This is the 5th drop of NV support on arm64 for this year, and most > >>> probably the last one for this side of Christmas. > >>> > >>> For the previous episodes, see [1]. > >>> > >>> What's changed: > >>> > >>> - Drop support for the original FEAT_NV. No existing hardware supports > >>> it without FEAT_NV2, and the architecture is deprecating the former > >>> entirely. This results in fewer patches, and a slightly simpler > >>> model overall. > >>> > >>> - Reorganise the series to make it a bit more logical now that FEAT_NV > >>> is gone. > >>> > >>> - Apply the NV idreg restrictions on VM first run rather than on each > >>> access. > >>> > >>> - Make the nested vgic shadow CPU interface a per-CPU structure rather > >>> than per-vcpu. > >>> > >>> - Fix the EL0 timer fastpath > >>> > >>> - Work around the architecture deficiencies when trapping WFI from a > >>> L2 guest. > >>> > >>> - Fix sampling of nested vgic state (MISR, ELRSR, EISR) > >>> > >>> - Drop the patches that have already been merged (NV trap forwarding, > >>> per-MMU VTCR) > >>> > >>> - Rebased on top of 6.7-rc2 + the FEAT_E2H0 support [2]. > >>> > >>> The branch containing these patches (and more) is at [3]. As for the > >>> previous rounds, my intention is to take a prefix of this series into > >>> 6.8, provided that it gets enough reviewing. > >>> > >>> [1] https://lore.kernel.org/r/20230515173103.1017669-1-maz@kernel.org > >>> [2] https://lore.kernel.org/r/20231120123721.851738-1-maz@kernel.org > >>> [3] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms= .git/log/?h=3Dkvm-arm64/nv-6.8-nv2-only > >>> > >> While I was testing this with kvmtool for 5.16 I noted the following o= n dmesg: > >> > >> [ 803.014258] kvm [19040]: Unsupported guest sys_reg access at: 8129f= a50 [600003c9] > >> { Op0( 3), Op1( 5), CRn( 1), CRm( 0), Op2( 2), func_re= ad }, > >> > >> This is CPACR_EL12. > > CPACR_EL12 is redirected to VNCR[0x100]. It really shouldn't trap... > > > >> Still need yet to debug. > > Can you disassemble the guest around the offending PC? >=20 > [ 1248.686350] kvm [7013]: Unsupported guest sys_reg access at: 812baa50 = [600003c9] > =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 { Op0( 3), Op1( 5), CRn( 1), CRm( 0), Op2( 2), func_read= }, >=20 > =C2=A012baa00:=C2=A0=C2=A0=C2=A0 14000008 =C2=A0=C2=A0=C2=A0 b=C2=A0=C2= =A0=C2=A0 0x12baa20 > =C2=A012baa04:=C2=A0=C2=A0=C2=A0 d000d501 =C2=A0=C2=A0=C2=A0 adrp=C2=A0= =C2=A0=C2=A0 x1, 0x2d5c000 > =C2=A012baa08:=C2=A0=C2=A0=C2=A0 91154021 =C2=A0=C2=A0=C2=A0 add=C2=A0=C2= =A0=C2=A0 x1, x1, #0x550 > =C2=A012baa0c:=C2=A0=C2=A0=C2=A0 f9400022 =C2=A0=C2=A0=C2=A0 ldr=C2=A0=C2= =A0=C2=A0 x2, [x1] > =C2=A012baa10:=C2=A0=C2=A0=C2=A0 f9400421 =C2=A0=C2=A0=C2=A0 ldr=C2=A0=C2= =A0=C2=A0 x1, [x1, #8] > =C2=A012baa14:=C2=A0=C2=A0=C2=A0 8a010042 =C2=A0=C2=A0=C2=A0 and=C2=A0=C2= =A0=C2=A0 x2, x2, x1 > =C2=A012baa18:=C2=A0=C2=A0=C2=A0 d3441c42 =C2=A0=C2=A0=C2=A0 ubfx=C2=A0= =C2=A0=C2=A0 x2, x2, #4, #4 > =C2=A012baa1c:=C2=A0=C2=A0=C2=A0 b4000082 =C2=A0=C2=A0=C2=A0 cbz=C2=A0=C2= =A0=C2=A0 x2, 0x12baa2c > =C2=A012baa20:=C2=A0=C2=A0=C2=A0 d2a175a0 =C2=A0=C2=A0=C2=A0 mov=C2=A0=C2= =A0=C2=A0 x0, #0xbad0000=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 // #195887104 > =C2=A012baa24:=C2=A0=C2=A0=C2=A0 f2994220 =C2=A0=C2=A0=C2=A0 movk=C2=A0= =C2=A0=C2=A0 x0, #0xca11 > =C2=A012baa28:=C2=A0=C2=A0=C2=A0 d69f03e0 =C2=A0=C2=A0=C2=A0 eret > =C2=A012baa2c:=C2=A0=C2=A0=C2=A0 d2c00080 =C2=A0=C2=A0=C2=A0 mov=C2=A0=C2= =A0=C2=A0 x0, #0x400000000=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 // #17179869184 > =C2=A012baa30:=C2=A0=C2=A0=C2=A0 f2b10000 =C2=A0=C2=A0=C2=A0 movk=C2=A0= =C2=A0=C2=A0 x0, #0x8800, lsl #16 > =C2=A012baa34:=C2=A0=C2=A0=C2=A0 f2800000 =C2=A0=C2=A0=C2=A0 movk=C2=A0= =C2=A0=C2=A0 x0, #0x0 > =C2=A012baa38:=C2=A0=C2=A0=C2=A0 d51c1100 =C2=A0=C2=A0=C2=A0 msr=C2=A0=C2= =A0=C2=A0 hcr_el2, x0 > =C2=A012baa3c:=C2=A0=C2=A0=C2=A0 d5033fdf =C2=A0=C2=A0=C2=A0 isb > =C2=A012baa40:=C2=A0=C2=A0=C2=A0 d53c4100 =C2=A0=C2=A0=C2=A0 mrs=C2=A0=C2= =A0=C2=A0 x0, sp_el1 > =C2=A012baa44:=C2=A0=C2=A0=C2=A0 9100001f =C2=A0=C2=A0=C2=A0 mov=C2=A0=C2= =A0=C2=A0 sp, x0 > =C2=A012baa48:=C2=A0=C2=A0=C2=A0 d538d080 =C2=A0=C2=A0=C2=A0 mrs=C2=A0=C2= =A0=C2=A0 x0, tpidr_el1 > =C2=A012baa4c:=C2=A0=C2=A0=C2=A0 d51cd040 =C2=A0=C2=A0=C2=A0 msr=C2=A0=C2= =A0=C2=A0 tpidr_el2, x0 > =C2=A012baa50:=C2=A0=C2=A0=C2=A0 d53d1040 =C2=A0=C2=A0=C2=A0 mrs=C2=A0=C2= =A0=C2=A0 x0, cpacr_el12 > =C2=A012baa54:=C2=A0=C2=A0=C2=A0 d5181040 =C2=A0=C2=A0=C2=A0 msr=C2=A0=C2= =A0=C2=A0 cpacr_el1, x0 > =C2=A012baa58:=C2=A0=C2=A0=C2=A0 d53dc000 =C2=A0=C2=A0=C2=A0 mrs=C2=A0=C2= =A0=C2=A0 x0, vbar_el12 > =C2=A012baa5c:=C2=A0=C2=A0=C2=A0 d518c000 =C2=A0=C2=A0=C2=A0 msr=C2=A0=C2= =A0=C2=A0 vbar_el1, x0 > =C2=A012baa60:=C2=A0=C2=A0=C2=A0 d53c1120 =C2=A0=C2=A0=C2=A0 mrs=C2=A0=C2= =A0=C2=A0 x0, mdcr_el2 > =C2=A012baa64:=C2=A0=C2=A0=C2=A0 9272f400 =C2=A0=C2=A0=C2=A0 and=C2=A0=C2= =A0=C2=A0 x0, x0, #0xffffffffffffcfff > =C2=A012baa68:=C2=A0=C2=A0=C2=A0 9266f400 =C2=A0=C2=A0=C2=A0 and=C2=A0=C2= =A0=C2=A0 x0, x0, #0xfffffffffcffffff > =C2=A012baa6c:=C2=A0=C2=A0=C2=A0 d51c1120 =C2=A0=C2=A0=C2=A0 msr=C2=A0=C2= =A0=C2=A0 mdcr_el2, x0 > =C2=A012baa70:=C2=A0=C2=A0=C2=A0 d53d2040 =C2=A0=C2=A0=C2=A0 mrs=C2=A0=C2= =A0=C2=A0 x0, tcr_el12 > =C2=A012baa74:=C2=A0=C2=A0=C2=A0 d5182040 =C2=A0=C2=A0=C2=A0 msr=C2=A0=C2= =A0=C2=A0 tcr_el1, x0 > =C2=A012baa78:=C2=A0=C2=A0=C2=A0 d53d2000 =C2=A0=C2=A0=C2=A0 mrs=C2=A0=C2= =A0=C2=A0 x0, ttbr0_el12 > =C2=A012baa7c:=C2=A0=C2=A0=C2=A0 d5182000 =C2=A0=C2=A0=C2=A0 msr=C2=A0=C2= =A0=C2=A0 ttbr0_el1, x0 > =C2=A012baa80:=C2=A0=C2=A0=C2=A0 d53d2020 =C2=A0=C2=A0=C2=A0 mrs=C2=A0=C2= =A0=C2=A0 x0, ttbr1_el12 > =C2=A012baa84:=C2=A0=C2=A0=C2=A0 d5182020 =C2=A0=C2=A0=C2=A0 msr=C2=A0=C2= =A0=C2=A0 ttbr1_el1, x0 > =C2=A012baa88:=C2=A0=C2=A0=C2=A0 d53da200 =C2=A0=C2=A0=C2=A0 mrs=C2=A0=C2= =A0=C2=A0 x0, mair_el12 > =C2=A012baa8c:=C2=A0=C2=A0=C2=A0 d518a200 =C2=A0=C2=A0=C2=A0 msr=C2=A0=C2= =A0=C2=A0 mair_el1, x0 > =C2=A012baa90:=C2=A0=C2=A0=C2=A0 d5380761 =C2=A0=C2=A0=C2=A0 mrs=C2=A0=C2= =A0=C2=A0 x1, s3_0_c0_c7_3 > =C2=A012baa94:=C2=A0=C2=A0=C2=A0 d3400c21 =C2=A0=C2=A0=C2=A0 ubfx=C2=A0= =C2=A0=C2=A0 x1, x1, #0, #4 > =C2=A012baa98:=C2=A0=C2=A0=C2=A0 b4000141 =C2=A0=C2=A0=C2=A0 cbz=C2=A0=C2= =A0=C2=A0 x1, 0x12baac0 > =C2=A012baa9c:=C2=A0=C2=A0=C2=A0 d53d2060 =C2=A0=C2=A0=C2=A0 mrs=C2=A0=C2= =A0=C2=A0 x0, s3_5_c2_c0_3 OK, this is suspiciously close to the location Ganapatrao was having issues with. Are you running on the same hardware? In any case, we should never take a trap for this access. Can you dump HCR_EL2 at the point where the guest traps (in switch.c)? > >> As for QEMU, it is having issues enabling _EL2 feature although EL2 > >> is supported by checking KVM_CAP_ARM_EL2; need yet to debug this. > > The capability number changes at each release. Make sure you resync > > your includes. >=20 > Been there but it seems a different problem this time. Creating the VM with SVE? NV doesn't support it yet (and it has been the case for a long while). M. --=20 Without deviation from the norm, progress is not possible. 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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B8440C5AD4C for ; Thu, 23 Nov 2023 16:45:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Subject:Cc:To:From:Message-ID:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=uHuqv1pD8j49gZNjFTKV1ToVnaBXgv3iyzwcPFLY+Vc=; b=vloanNpy5tm4W9 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Nov 2023 16:44:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700757877; bh=QE1UBMJM5H60d9fEa4rL89oCeBbt8rlDAZb/2FhqlaI=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=m4ee7bnIn5Ijb6AndVKhEJr0ZWivopONg7hEb3TVLchy9JvnoWRQmHF8sLs3sY6QP NMvfo7239wYRLGCUsvaZNvxlY+oPtLiAKeDuI402UgA4mw4nloF5giDLIgOCH8wA3s Cen5lMU3swZjwdci+3HCPCYle8mm90QX51n+hBipNPCzxxl8x6fAgOVDuYn3pL0+gh wEL1K8e+1m3bnoJdIB/xFMae1/EFMKY3Ew7RHdl32PduRffruoziXSWYgRkhfyfSci zaWptwUBsl8fmx+R76L9bNkv3o5fi4nuYLFljWZof1IBUjwOgNkCmwnx6ZWM/8S1Pb jkAMXBTAqi1nw== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1r6Coc-00Fpyj-Fa; Thu, 23 Nov 2023 16:44:34 +0000 Date: Thu, 23 Nov 2023 16:44:34 +0000 Message-ID: <86a5r4zafh.wl-maz@kernel.org> From: Marc Zyngier To: Miguel Luis Cc: "kvmarm@lists.linux.dev" , "kvm@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Alexandru Elisei , Andre Przywara , Chase Conklin , Christoffer Dall , Ganapatrao Kulkarni , Darren Hart , Jintack Lim , Russell King , James Morse , Suzuki K Poulose , Oliver Upton , Zenghui Yu Subject: Re: [PATCH v11 00/43] KVM: arm64: Nested Virtualization support (FEAT_NV2 only) In-Reply-To: <05733774-4210-4097-9912-fb3aa8542fdd@oracle.com> References: <20231120131027.854038-1-maz@kernel.org> <86msv7ylnu.wl-maz@kernel.org> <05733774-4210-4097-9912-fb3aa8542fdd@oracle.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/29.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: miguel.luis@oracle.com, kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, alexandru.elisei@arm.com, 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