From nobody Mon Feb 9 04:14:36 2026 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (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 AAD2E1DE4FE for ; Thu, 21 Nov 2024 18:53:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732215205; cv=none; b=igO7x6wls1blPoA3pvzbx3d/IrhTeC79YnJv30Jq3149KyaXaBcA51EzLtPXbu6vZhdoyhXtWPiV3UTi48hexARfTIi/yZvp+4nlBgnJu1zExPhprCdA7XPl/uejoHc0bvyV9+6xB15NePMs2jYdMltISANTs6GZG4YcsyvXkf4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732215205; c=relaxed/simple; bh=/MlTsvEZhBm6lsxe7EmxCdECCTQKt4d+z1t/zvxQERw=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=FVNzkBys9MgV0bvGtYKWmUL2kBapCZ4UJrLlFWrL0Dbtdx33CmXKTdcl7elrcSVc6ENrqPmhMrzLljh9Y7s66Sy8pvSghIex+Ityd4iEJ7Bwh3cFk2REtJpmxMsxKfYcUMvJq4XwhfPsKgRxUrxu7Z5B1r6O0RhySa9qwJwISqg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--mizhang.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=hFstuxpQ; arc=none smtp.client-ip=209.85.219.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--mizhang.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="hFstuxpQ" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-e330f65bcd9so1568165276.1 for ; Thu, 21 Nov 2024 10:53:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1732215202; x=1732820002; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=rsHo0Py3TPU7pbh7g3h3HouheNFLNCt6iVoC0xc8Ffg=; b=hFstuxpQUnAlVZ3bZY0abEGefUG6T5jzWCjPKELKL2luMCA0BgWlYBnf/t8KI/Fcag gpjsF21oDoUURQfgS4Wtb3BXl+i//gNyaPJOEEjy94US8YihoTUdtW4SitxRCesVEUea vxHJdK4GDFgE30iC1NVwzwk3rhAHsEz/WzYnSvpT6QoXZn6VNSgF1bkyRmSRRfz8V28D mqOkCcoeTfkTgrENC3dl7X04Z54uYxMrQJFtuhQdY1xPkHd158oMT3CfiyF0wWNtQcRE VBs35tgJczBa26nosQ4/hsw0AJLMnOMQpyqBse7zc2u04zwX6FF31jQidRu6qcUJI78z LHsQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732215202; x=1732820002; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=rsHo0Py3TPU7pbh7g3h3HouheNFLNCt6iVoC0xc8Ffg=; b=El7jZv5v5lVJnhikIa/if7jNvFecFNSmUVlmeynEszA2CKqg9XAW/ElKHD3M0h84Qa 8OR9t7aLIPRy+1RVS2zFD0PHvYiqbx+7xtsugVdUV3LPOH8SLe087CI+Q+qaqecCKIZQ F+6OyjX1X2oWp3oJ5tP3gziYAc0cG3SD4YWjTFj0r/oWmVpdvEQqp5Ye2qmFI3qOfbNA LgYzbCqNZ+6jlOQ4c0elXxJ3osFOEoAs134v1j/DnoyujI0RY5BlhlsI4Cmj9qvkC6vz ULD1w29Pdq3IXv3e5X8s8smo70KFbbpQf8XWAOWLWYAV08aqHJSYwZJZa9EaT34BEQos G2jg== X-Forwarded-Encrypted: i=1; AJvYcCU61Z+2ELEKQzXlJlg8XELuLu1rvfLKeuvKnFfAiQtPqXS1K4nvk4ca+M4PCxycZ3h5tO9KxQGAeZJILHk=@vger.kernel.org X-Gm-Message-State: AOJu0YySshPLL4LGTwUcWx8kMEeWbVnoaLbtPKlP+OLGg6/zRFSUGZpp pbV12VNQLY2Hq+68n0HiZm917A7z1wk7/wDk5pG7m2XxX56cjD4Mz4BY0CrLYQdfnRRMTkgzuxm hskQ9rw== X-Google-Smtp-Source: AGHT+IEa89oTDs6AEs0b6qM9YtZe6l8s01zJVqD4TK4bwVkMk4+VBxvLRHFEIhtWa5nFhIw1lpDFQnaYmZLg X-Received: from mizhang-super.c.googlers.com ([35.247.89.60]) (user=mizhang job=sendgmr) by 2002:a25:e90b:0:b0:e2e:317a:d599 with SMTP id 3f1490d57ef6-e38f700d9c3mr998276.2.1732215202627; Thu, 21 Nov 2024 10:53:22 -0800 (PST) Reply-To: Mingwei Zhang Date: Thu, 21 Nov 2024 18:52:55 +0000 In-Reply-To: <20241121185315.3416855-1-mizhang@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241121185315.3416855-1-mizhang@google.com> X-Mailer: git-send-email 2.47.0.371.ga323438b13-goog Message-ID: <20241121185315.3416855-4-mizhang@google.com> Subject: [RFC PATCH 03/22] x86/aperfmperf: Introduce restore_host_[am]perf() From: Mingwei Zhang To: Sean Christopherson , Paolo Bonzini , Huang Rui , "Gautham R. Shenoy" , Mario Limonciello , "Rafael J. Wysocki" , Viresh Kumar , Srinivas Pandruvada , Len Brown Cc: "H. Peter Anvin" , Perry Yuan , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Jim Mattson , Mingwei Zhang Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Jim Mattson Round out the {host,guest}[am]perf APIs by adding functions to restore host values to the hardware MSRs. These functions: 1. Write the current host value (obtained via get_host_[am]perf()) to the corresponding MSR 2. Clear the per-CPU offset used to track the difference between guest and host values Signed-off-by: Jim Mattson --- arch/x86/include/asm/topology.h | 2 ++ arch/x86/kernel/cpu/aperfmperf.c | 16 ++++++++++++++++ 2 files changed, 18 insertions(+) diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topolog= y.h index fef5846c01976..8d4d4cd41bd84 100644 --- a/arch/x86/include/asm/topology.h +++ b/arch/x86/include/asm/topology.h @@ -309,6 +309,8 @@ extern u64 get_host_aperf(void); extern u64 get_host_mperf(void); extern void set_guest_aperf(u64 aperf); extern void set_guest_mperf(u64 mperf); +extern void restore_host_aperf(void); +extern void restore_host_mperf(void); =20 extern void arch_scale_freq_tick(void); #define arch_scale_freq_tick arch_scale_freq_tick diff --git a/arch/x86/kernel/cpu/aperfmperf.c b/arch/x86/kernel/cpu/aperfmp= erf.c index 8b66872aa98c1..4d6c0b8b39452 100644 --- a/arch/x86/kernel/cpu/aperfmperf.c +++ b/arch/x86/kernel/cpu/aperfmperf.c @@ -135,6 +135,22 @@ void set_guest_mperf(u64 guest_mperf) } EXPORT_SYMBOL_GPL(set_guest_mperf); =20 +void restore_host_aperf(void) +{ + WARN_ON_ONCE(!irqs_disabled()); + wrmsrl(MSR_IA32_APERF, get_host_aperf()); + this_cpu_write(host_aperf_offset, 0); +} +EXPORT_SYMBOL_GPL(restore_host_aperf); + +void restore_host_mperf(void) +{ + WARN_ON_ONCE(!irqs_disabled()); + wrmsrl(MSR_IA32_MPERF, get_host_mperf()); + this_cpu_write(host_mperf_offset, 0); +} +EXPORT_SYMBOL_GPL(restore_host_mperf); + static bool __init turbo_disabled(void) { u64 misc_en; --=20 2.47.0.371.ga323438b13-goog