From patchwork Tue Jul 28 08:22:54 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marc Zyngier X-Patchwork-Id: 11688635 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6B2B814DD for ; Tue, 28 Jul 2020 08:23:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 52CDC20A8B for ; Tue, 28 Jul 2020 08:23:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1595924607; bh=iJ+8/MWn5KdaoZ81Y0HfDlr48qzak2k8kb91X6SO0S4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ebA034D9jE2owQJs68HU26/U436ow76iiL+7cRDxIttIVXy/ubgewOB+D7V9cbxmQ +e+8uRuxW0ZFs9PPP2PqNv0Ee1+GU7g19fgkh8w7cQQVP4twjVrIewy+uNlp6Itwjs jF6rYUhrl8MAp2IEAU96Ois9+56ozW2fVIkPNXGg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728037AbgG1IX0 (ORCPT ); Tue, 28 Jul 2020 04:23:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:49340 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727878AbgG1IXZ (ORCPT ); Tue, 28 Jul 2020 04:23:25 -0400 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id F0B4820809; Tue, 28 Jul 2020 08:23:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1595924605; bh=iJ+8/MWn5KdaoZ81Y0HfDlr48qzak2k8kb91X6SO0S4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2uewzYw+Xs67HzTT2pJajyh1R5CYcRLNJBkQAy0ca72w4NYphAI5cXI/qsrZk+gbl oCAXjVjUAa24o1lA0ewSimmiTtPJPx2LWThxiP8+NgPur0ha3BJ5ydDIiw+ceqxwog +ToKOaROkXVQnHLz0hrkP8AmJqLeQgQWGrXs4Ar0= Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1k0KtP-00FaXh-GW; Tue, 28 Jul 2020 09:23:23 +0100 From: Marc Zyngier To: Paolo Bonzini Cc: Nathan Chancellor , Nick Desaulniers , Quentin Perret , Will Deacon , James Morse , Julien Thierry , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, kernel-team@android.com Subject: [PATCH 1/2] KVM: arm64: Prevent vcpu_has_ptrauth from generating OOL functions Date: Tue, 28 Jul 2020 09:22:54 +0100 Message-Id: <20200728082255.3864378-2-maz@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200728082255.3864378-1-maz@kernel.org> References: <20200728082255.3864378-1-maz@kernel.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: pbonzini@redhat.com, natechancellor@gmail.com, ndesaulniers@google.com, qperret@google.com, will@kernel.org, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org So far, vcpu_has_ptrauth() is implemented in terms of system_supports_*_auth() calls, which are declared "inline". In some specific conditions (clang and SCS), the "inline" very much turns into an "out of line", which leads to a fireworks when this predicate is evaluated on a non-VHE system (right at the beginning of __hyp_handle_ptrauth). Instead, make sure vcpu_has_ptrauth gets expanded inline by directly using the cpus_have_final_cap() helpers, which are __always_inline, generate much better code, and are the only thing that make sense when running at EL2 on a nVHE system. Fixes: 29eb5a3c57f7 ("KVM: arm64: Handle PtrAuth traps early") Reported-by: Nathan Chancellor Reported-by: Nick Desaulniers Signed-off-by: Marc Zyngier Tested-by: Nathan Chancellor Reviewed-by: Nathan Chancellor Link: https://lore.kernel.org/r/20200722162231.3689767-1-maz@kernel.org --- arch/arm64/include/asm/kvm_host.h | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index c3e6fcc664b1..e21d4a01372f 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -380,9 +380,14 @@ struct kvm_vcpu_arch { #define vcpu_has_sve(vcpu) (system_supports_sve() && \ ((vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_SVE)) -#define vcpu_has_ptrauth(vcpu) ((system_supports_address_auth() || \ - system_supports_generic_auth()) && \ - ((vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_PTRAUTH)) +#ifdef CONFIG_ARM64_PTR_AUTH +#define vcpu_has_ptrauth(vcpu) \ + ((cpus_have_final_cap(ARM64_HAS_ADDRESS_AUTH) || \ + cpus_have_final_cap(ARM64_HAS_GENERIC_AUTH)) && \ + (vcpu)->arch.flags & KVM_ARM64_GUEST_HAS_PTRAUTH) +#else +#define vcpu_has_ptrauth(vcpu) false +#endif #define vcpu_gp_regs(v) (&(v)->arch.ctxt.gp_regs)