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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 22B6FC433F5 for ; Tue, 12 Apr 2022 20:06:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232384AbiDLUIW (ORCPT ); Tue, 12 Apr 2022 16:08:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35242 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231571AbiDLUHW (ORCPT ); Tue, 12 Apr 2022 16:07:22 -0400 Received: from mail-wm1-x34a.google.com (mail-wm1-x34a.google.com [IPv6:2a00:1450:4864:20::34a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7E68DD7A for ; Tue, 12 Apr 2022 12:59:12 -0700 (PDT) Received: by mail-wm1-x34a.google.com with SMTP id r64-20020a1c2b43000000b0038b59eb1940so1358698wmr.0 for ; Tue, 12 Apr 2022 12:59:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=reply-to:date:in-reply-to:message-id:mime-version:references :subject:from:cc; bh=RrsbXUK/Kg1lBZszfiVUYqQQmOv+SBqm4xpVr9KrDtY=; b=lpIaS53ZHrYAuHFgcuP/VAOX3kdik3hdWGO9ws4SpF3a2fUcQlNlu4E/nKtT2JL2kg wj2Ef1gsOleUXCf1ZhpDdjlOU7wd+oBRSNGLoKdUVMr/v/uBAFDVtIM1QUvU5vvm/N3S gdodnCH3sfERh0Az2dALpAcOMyV5Nto5VIYeCoMCQsqDcbYLWrByI1tKnHsANwWz2hNa 3Yjbq2QBZ6d+pyj5+NIgiWXtkcypjCFX516dsFnT2Y+EprUp3oIO7O7oGjA4m7unHti3 Mt9Xag9Vxa8l2NcqYf48PxQxcht/akHpkV4y/epAVGLPPTQG5qSoCXXwYiMqUA8CeTCN fnQg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:reply-to:date:in-reply-to:message-id :mime-version:references:subject:from:cc; bh=RrsbXUK/Kg1lBZszfiVUYqQQmOv+SBqm4xpVr9KrDtY=; b=XiUBkTbwqwFUd4ZzgXJOUi8MReeG3dY6KS/+y8Dm6gCzGJGx8Awcc+7IHS2fgsSXti 5cDERi8cDktMXI0x7FSs9/GyvKR9G5Vqh2N0wEJsuEkdHM50k8zjvFZVmytXD8UGXnpC /eMz/Deo2NT6BitWlHp/+lXo12fyKfR6wBkId+vlCo6G/tumbx4xqh5F3i/SxwP+IT7H gFpyanCiQKIdaVONw7zLhuVS8kqTDUbEDwMYoyuyLMZ8q57qZITcJ/6SjJFa3muEKOTl Uq+ExA2kDK8o3Wm+pNYHf1hI4NXIbNKOJ4JnI1pmU/AKuy8WS2zn7/vsFxw6fr9wsJvs hz0A== X-Gm-Message-State: AOAM531aLDBfEzmGEwtOg4kPIAbYzCFWPAi4Jfa2cVzcE9vGWOVAtPul yKxD9u2X1/EwgQY+BGOU2PLUo4e55isV X-Google-Smtp-Source: ABdhPJxTBgOzizhV2r5BUw38L4VsbWMRuWBwDWbgLZIdgzRzYzISd3bBRk5vGVgNk9zRzMp9pvoWmvMpWp4O X-Received: from zhanwei.c.googlers.com ([fda3:e722:ac3:cc00:28:9cb1:c0a8:2da8]) (user=zhanwei job=sendgmr) by 2002:a1c:2744:0:b0:382:a9b7:1c8a with SMTP id n65-20020a1c2744000000b00382a9b71c8amr5299035wmn.187.1649793547162; Tue, 12 Apr 2022 12:59:07 -0700 (PDT) Reply-To: Wei Zhang Date: Tue, 12 Apr 2022 19:58:46 +0000 In-Reply-To: <20220412195846.3692374-1-zhanwei@google.com> Message-Id: <20220412195846.3692374-3-zhanwei@google.com> Mime-Version: 1.0 References: <20220412195846.3692374-1-zhanwei@google.com> X-Mailer: git-send-email 2.35.1.1178.g4f1659d476-goog Subject: [PATCH 2/2] KVM: x86: illustrative example for sending guest _stext with a hypercall From: Wei Zhang Cc: Wei Zhang , Suleiman Souhlal , Sangwhan Moon , Ingo Molnar , Paolo Bonzini , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org A guest could send its _stext with the newly added hypercall. The statistics collected afterwards will be correct in the kernel. Signed-off-by: Wei Zhang --- arch/x86/kernel/setup.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c index c95b9ac5a457..ee8c4fd4efe9 100644 --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -24,6 +24,7 @@ #include #include +#include #include #include @@ -1241,6 +1242,11 @@ void __init setup_arch(char **cmdline_p) #endif unwind_init(); + + /* + * Send the _stext to the host kernel. + */ + kvm_hypercall1(KVM_HC_GUEST_STEXT, (unsigned long)_stext); } #ifdef CONFIG_X86_32 -- 2.35.1.1178.g4f1659d476-goog