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=-7.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no 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 948A2C433EF for ; Sat, 4 Sep 2021 09:39:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 788B361056 for ; Sat, 4 Sep 2021 09:39:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351136AbhIDJkz (ORCPT ); Sat, 4 Sep 2021 05:40:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351126AbhIDJky (ORCPT ); Sat, 4 Sep 2021 05:40:54 -0400 Received: from mail-io1-xd2e.google.com (mail-io1-xd2e.google.com [IPv6:2607:f8b0:4864:20::d2e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D5898C061575; Sat, 4 Sep 2021 02:39:52 -0700 (PDT) Received: by mail-io1-xd2e.google.com with SMTP id e186so1683533iof.12; Sat, 04 Sep 2021 02:39:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=CTXSPDkXsHMJtY8UzqhHPI20F6z6tQe3o1bV6MS8KHE=; b=Bx1/NMIjPDbtj7yVO6TxV8zVHjvnxA0qe9WjKVk19MYipCFbD4zzeoxbkn5AQmU/O0 1tE4t7LH8Ub9mGEb+0R2FYgp8phpSp/oSgay8TBS36rsckSPJBJGOqvKV5fI0z3PFX0H 9KJ3AwwDekr7p/rw/go8jV6Ey6a4KFt5priXjjnPVQ3cKYIaqeAuIHNfGhs+pt4e4dGd DKQEba+hCa37FjJWVTtUcbf4CwhHrbAbQud+eVt2IVkV9M5vDFpFdeNt7kXU/CnMyUKo iJuX1XWkTKDi1qnWlpXonYijieFx5Z/xTq0y5jiNXvv7QnNAoI09NEGuEjeWe6x2KAKu FwJg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=CTXSPDkXsHMJtY8UzqhHPI20F6z6tQe3o1bV6MS8KHE=; b=kxT3ljohMu3wagOqs4QEkuUUK52tR7hh/tHWCB9T5jxcv1nCKf4ZbrBKrDslRVEgIQ nXdFdnDWbKl5AXbfJEk2zqlGTQVcuwR5Uu18Olf/TpAVlIeRZCar0gZxpVlKi5eAveHo cumdHBfmYydo39nr8tVsE6XPfsxljPiM+uOnKzWmx3Q5+Iw4Qv0LP1iVvwNfpKEaa37I 1Owfa5jNl9T2nTl5P+b4biWZ8DCdbVWcTjzq4WKuLBxiHtOrgSkKWEqcVkAZkBSf16O9 DbDxJmdzr6KmaeL1tRKtZvmSFnYNiFA46JtPF9zR1K/VVnV8zA03RGO85AScDBzeAOib TCog== X-Gm-Message-State: AOAM530nRBYTcdQanS2aUagwiEUfH3XMnnYGAO1XzAe3afPi+hN5Xefq uNAsXL2sGhMBAdWRQczGW45UHwiundKktJD+A/0= X-Google-Smtp-Source: ABdhPJzv+UKlBHeKZQPE95qRzjqHei343vDShxOHA7qym7IXRZ990tFXu8oqMKr1yejoqttVhvqx9gvky+piUFJ4cjU= X-Received: by 2002:a6b:b502:: with SMTP id e2mr2435889iof.152.1630748392236; Sat, 04 Sep 2021 02:39:52 -0700 (PDT) MIME-Version: 1.0 References: <20200824085511.7553-1-joro@8bytes.org> <20200824085511.7553-43-joro@8bytes.org> In-Reply-To: <20200824085511.7553-43-joro@8bytes.org> From: Lai Jiangshan Date: Sat, 4 Sep 2021 17:39:41 +0800 Message-ID: Subject: Re: [PATCH v6 42/76] x86/sev-es: Setup early #VC handler To: Joerg Roedel Cc: X86 ML , Joerg Roedel , "H. Peter Anvin" , Andy Lutomirski , Dave Hansen , Peter Zijlstra , Jiri Slaby , Dan Williams , Tom Lendacky , Juergen Gross , Kees Cook , David Rientjes , Cfir Cohen , Erdem Aktas , Masami Hiramatsu , Mike Stunes , Sean Christopherson , Martin Radev , LKML , kvm@vger.kernel.org, virtualization@lists.linux-foundation.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > @@ -363,6 +370,33 @@ SYM_CODE_START_LOCAL(early_idt_handler_common) > jmp restore_regs_and_return_to_kernel > SYM_CODE_END(early_idt_handler_common) > > +#ifdef CONFIG_AMD_MEM_ENCRYPT > +/* > + * VC Exception handler used during very early boot. The > + * early_idt_handler_array can't be used because it returns via the > + * paravirtualized INTERRUPT_RETURN and pv-ops don't work that early. Hello Joerg, Juergen The commit ae755b5a4548 ("x86/paravirt: Switch iret pvops to ALTERNATIVE") ( https://lore.kernel.org/lkml/20210311142319.4723-12-jgross@suse.com/ ) had been merged and the paravirt_iret is deferenced based via %rip. Can INTERRUPT_RETURN still be a problem if early_idt_handler_array is used instead for bringup IDT? Thanks Lai