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=-13.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 8F7A5C433E0 for ; Tue, 21 Jul 2020 16:13:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5EDA42073A for ; Tue, 21 Jul 2020 16:13:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=vmm.dev header.i=@vmm.dev header.b="fy7L/4Re" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730055AbgGUQNC (ORCPT ); Tue, 21 Jul 2020 12:13:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42244 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726890AbgGUQNB (ORCPT ); Tue, 21 Jul 2020 12:13:01 -0400 Received: from mail-pl1-x644.google.com (mail-pl1-x644.google.com [IPv6:2607:f8b0:4864:20::644]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 642D6C061794 for ; Tue, 21 Jul 2020 09:13:01 -0700 (PDT) Received: by mail-pl1-x644.google.com with SMTP id 72so10467167ple.0 for ; Tue, 21 Jul 2020 09:13:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=vmm.dev; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=wDitsdDHDoETDTxDKluPrWhU2D8DE6u8BnPSmRmrGh4=; b=fy7L/4Re2TIFmm12k2i3bXju6ZZlkbEA1354CbMIGv3i6xktgqXThaI1n9+yLvVeEO C6XotX0xy43lCHKadVKvJu6as164ENvY1aZYC+Yyk6hrIbMWtMK5qbbY/oAzlC1QJc/Q 8TrLwbEZwu3d5Il0QNTGzHqDr1Wi7ruxTjCJbyOBHnxKClmMl1qVy2GQASFp3s9u8YP4 VSo4vbTiSmKkp48DBE9pCIvmYDvC2JPmk5mrF9XSkbyYnR9veMcyfz8PlL4ZXKXSqov7 yfHhV8BL0GsYeU64KxJy8smQviZ1pKkO7sM+BGXTVcqsJVnmyRO6wSLGb235TJ1J3hxc UCEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=wDitsdDHDoETDTxDKluPrWhU2D8DE6u8BnPSmRmrGh4=; b=GGxd7rqwEeFz2iflQ8RZytXLVyDVUHNwI06D67aThunPeyADkm0dp2VYJGJgjZYLRN CTl3THIlfbdHb+kC4CVuZlOqR5PLzhsUbkN5ACSLUdTlLxuyJda7CJQre6jx0i4bhccW abloiEZctz5n0qeesNXblMfMKCp6rLu5AtaH+qmRC3HxO4U9vD89latyV7pNEaBCbn89 h+nBjW6c55qV6N9f6bWC0CRt3EUjO3SqBUToQlmbBDDyAXJm88MmJ0IthSNfPnKyyENi M2NH8umySw9VF193JObdPZpOkubFqlu/FO0apImvsabHmGdzWTraQTLW7TIJ2j5Dusnr wVXA== X-Gm-Message-State: AOAM532SreAgr+WdzjFFJq0SG3n0bE437xJCmBBXjfvZfK15sBXkcic0 zr3pumcRGDCXqQKv1ziZZtj8MA== X-Google-Smtp-Source: ABdhPJz/4Rls+u9+PMZSs3OFi3HIkImvb038W2RxX4ZvHHXgVr6fOs32UJtvHWbBcLF6bDLtkM4tvg== X-Received: by 2002:a17:902:8ecb:: with SMTP id x11mr17341190plo.123.1595347980879; Tue, 21 Jul 2020 09:13:00 -0700 (PDT) Received: from ip-172-31-28-103.ap-northeast-1.compute.internal (ec2-18-183-109-148.ap-northeast-1.compute.amazonaws.com. [18.183.109.148]) by smtp.gmail.com with ESMTPSA id y80sm20467763pfb.165.2020.07.21.09.12.57 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 21 Jul 2020 09:13:00 -0700 (PDT) From: Hayato Ohhashi To: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org Cc: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, boris.ostrovsky@oracle.com, jgross@suse.com, sstabellini@kernel.org, Hayato Ohhashi Subject: [PATCH] x86/xen/time: set the X86_FEATURE_TSC_KNOWN_FREQ flag in xen_tsc_khz() Date: Tue, 21 Jul 2020 16:12:31 +0000 Message-Id: <20200721161231.6019-1-o8@vmm.dev> X-Mailer: git-send-email 2.23.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If the TSC frequency is known from the pvclock page, the TSC frequency does not need to be recalibrated. We can avoid recalibration by setting X86_FEATURE_TSC_KNOWN_FREQ. Signed-off-by: Hayato Ohhashi --- arch/x86/xen/time.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c index c8897aad13cd..91f5b330dcc6 100644 --- a/arch/x86/xen/time.c +++ b/arch/x86/xen/time.c @@ -39,6 +39,7 @@ static unsigned long xen_tsc_khz(void) struct pvclock_vcpu_time_info *info = &HYPERVISOR_shared_info->vcpu_info[0].time; + setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ); return pvclock_tsc_khz(info); } -- 2.23.3