From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8CBEF15A3 for ; Fri, 29 Sep 2023 00:42:23 +0000 (UTC) Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-1c577fea3dcso140066555ad.2 for ; Thu, 28 Sep 2023 17:42:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1695948143; x=1696552943; darn=lists.linux.dev; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=LHnl2CsLxrfQz4bzbwJAj223y7XyxSn5JpaUfYsfSDE=; b=QxRbLfX/+PVqLVBF4PYeS4SURQEtbOrG70tf7hM31ltJbrCVSL40bVTJuXNl8AF/oA PwG98J1gaofo4NiMEpFHly0GcPFL/d6F6S7eLcLBvk3nQc6XSHupsB75VU6AS93l2iR8 /ridGq6n6hgFY9Zd1kFuJ9koSW/IfTS6mhF/ytv93fPCJqD2fyACk8T3JjJxQ14V9ARG WcNGshHRzrC5axzccPlGagJsnLlObSdSAThU+LZsQLwYiX6ElD2yrbdYFUlXANhNnGO4 YzS2Egu8M+l1ACdUq8dwcfVGFYyRcUuUtBqKakw55ImbNt3FuC2zXdi6F14OOcBs/Yti uK6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695948143; x=1696552943; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=LHnl2CsLxrfQz4bzbwJAj223y7XyxSn5JpaUfYsfSDE=; b=BXQb3OrMNr5p0eSK0kwCq1Mvm/AkH7mQLZGrrySQUM7oKfDg7JCsLEW5XQ/DsafN4K i6MgqQvv3akGeFExu99S8ijB1Dh85hFigwm4mthhYUcLnA043JM2yfIzsZ4lBvkLQIc1 lJ9LbqSwRHyVEDpRHLzcQ+/w6Nua3iouHda4lkyWHMd7+g/FTu6UEuHRAFAZbxEb3wSt VBir53TT6oPheDj0nz7E5QFs8vhFlBf0w8ZujaNNjY/dpBW4wbTmQisQkpuOuFdNk5wT eFMeHEbSxv7yu77ZCkPGU0DzwP2oiJdZPYWtCQhb9+ktiDm5RwIJz+jnDWqpz/0sh7Pq apIQ== X-Gm-Message-State: AOJu0Yx4OBrxRYTRJgSnCQ08Iqkq9cg9rP6yHfw+eKOuiMVCbDWQpgzE xZ/RacnP/qBdOjSNrRxS3zp8GyH5etc= X-Google-Smtp-Source: AGHT+IHUEPW3H4eE8hL9x01DrF8EV6/qXIdYZHJV+3Ch6SWg/Ia5upLk5S9Kq+TjsAHT50edQJbCK+giAKY= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a17:902:e851:b0:1c6:2b9d:570b with SMTP id t17-20020a170902e85100b001c62b9d570bmr34467plg.7.1695948142799; Thu, 28 Sep 2023 17:42:22 -0700 (PDT) Date: Thu, 28 Sep 2023 17:42:20 -0700 In-Reply-To: <20230928173354.217464-3-mlevitsk@redhat.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20230928173354.217464-1-mlevitsk@redhat.com> <20230928173354.217464-3-mlevitsk@redhat.com> Message-ID: Subject: Re: [PATCH v2 2/4] x86: KVM: SVM: add support for Invalid IPI Vector interception From: Sean Christopherson To: Maxim Levitsky Cc: kvm@vger.kernel.org, iommu@lists.linux.dev, "H. Peter Anvin" , Paolo Bonzini , Thomas Gleixner , Borislav Petkov , Joerg Roedel , x86@kernel.org, Suravee Suthikulpanit , linux-kernel@vger.kernel.org, Dave Hansen , Will Deacon , Ingo Molnar , Robin Murphy , stable@vger.kernel.org Content-Type: text/plain; charset="us-ascii" On Thu, Sep 28, 2023, Maxim Levitsky wrote: > In later revisions of AMD's APM, there is a new 'incomplete IPI' exit code: > > "Invalid IPI Vector - The vector for the specified IPI was set to an > illegal value (VEC < 16)" > > Note that tests on Zen2 machine show that this VM exit doesn't happen and > instead AVIC just does nothing. > > Add support for this exit code by doing nothing, instead of filling > the kernel log with errors. > > Also replace an unthrottled 'pr_err()' if another unknown incomplete > IPI exit happens with vcpu_unimpl() > > (e.g in case AMD adds yet another 'Invalid IPI' exit reason) > > Cc: > Signed-off-by: Maxim Levitsky > --- Reviewed-by: Sean Christopherson