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=-2.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,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 575A4C636CA for ; Wed, 21 Jul 2021 14:20:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 31C9761246 for ; Wed, 21 Jul 2021 14:20:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238885AbhGUNjy (ORCPT ); Wed, 21 Jul 2021 09:39:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53682 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232785AbhGUNjx (ORCPT ); Wed, 21 Jul 2021 09:39:53 -0400 Received: from mail-qt1-x82a.google.com (mail-qt1-x82a.google.com [IPv6:2607:f8b0:4864:20::82a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 478B1C061575 for ; Wed, 21 Jul 2021 07:20:30 -0700 (PDT) Received: by mail-qt1-x82a.google.com with SMTP id r17so1977179qtp.5 for ; Wed, 21 Jul 2021 07:20:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=NIayiqzujDc7AZWJFwZQRXdbiOz5U1FB/LPA9woxhDs=; b=ecyIj+tOWl/XowrA+prU7DQmM65e0AMJJe5kDjrrYNMS9kSFKH0424xFeA+XCCluuS gHcM6KJjTgJDnpI8j4c+ZYB4Jm1bRSjIndS0AjfQDgYgsmbABX2FtLHSYK6oWT6tgVEe JPPOjrv/GjHa9fMzM3HxfM8c2XPbfFOSC7AnyjTfCdFtULHdsJ5e9tBqrciRl14B+sEE hTudqc67PHtzvNH/+lZrBQphDctXE3yhRUHpL/B7NdUl3jpw3h3Ico13NgP3i6Dpn9lc EyFej1AN/dp7oyIvWQebfZtyGoZ1M0/uWaLHIFFoAEPG80LWVJMo7kiZcGnJhU21JVza pszQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=NIayiqzujDc7AZWJFwZQRXdbiOz5U1FB/LPA9woxhDs=; b=fs1O5cHpJ1qpPYoBuaJh3fVmIYabpqn4W6hhc8ffjZzQkxeyPw7Q/ixX8t7ZJRl0pY g4N7Rx4UsALUMTRsNGIilUkMRWmsO06m13bXi45F0M62OSJ0ALGwCyPc/kVpe3QTowYM 0Sxkc9ga+VFscwFTi1bHa6a/L66ZvWKGqjhkDV7vzzscEuYu1SMXmP4uBj4gGsn3+oE4 IESLSWzV7uIyLW0VvD/czqc7kTRXFtSQe37QrF0207mR1y6J6+/tHNbrJ5uHTe2voT6S q0Vcsrd8I1Cln4QLwY/BIG3klICKh6I4na9bPvnHB36zysQdKIWhQLWrWwZKhEU5yE0Q t36w== X-Gm-Message-State: AOAM53012M2CcmSvd2amKR/SA7MFb4sJJ2YYy7aCtIVmFM2SKJ87z+1w wr7KpVdIk7HYlIf8UmfYj/wHwM9hgRA4uAvD4xWKpXSO6LXMREdNVBY= X-Google-Smtp-Source: ABdhPJwmsmcX/E20+Dv+9yYFKa3YK57t0aDZhkBQfgj3Y5cZoo6C46PY6CfI9OcTJAf6u1TZqojx/QjahSszYR+EiO8= X-Received: by 2002:ac8:4e44:: with SMTP id e4mr6112333qtw.252.1626877229351; Wed, 21 Jul 2021 07:20:29 -0700 (PDT) MIME-Version: 1.0 From: KVM Man Date: Wed, 21 Jul 2021 09:20:18 -0500 Message-ID: Subject: kvm_read_guest_virt returning unexpected data To: kvm@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Hi, I'm making changes to KVM on linux 5.11.4 while using qemu 5.0.0 and having issues using kvm_read_guest_virt successfully with an x86_64 VM guest. I call kvm_read_guest_virt in a VM exit handler, and it returns data that's unexpected, as compared to what I see with a kernel debugger attached to the guest. The function returns a successful error code (X86EMUL_CONTINUE), and I've verified that virtual to physical address translation is working properly when kvm_read_guest_virt_helper calls vcpu->arch.walk_mmu->gva_to_gpa. Are there any reasons that this function would not work as expected? Thanks.