From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f202.google.com (mail-pl1-f202.google.com [209.85.214.202]) (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 0DD714D2ED2 for ; Wed, 1 Jul 2026 19:33:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782934392; cv=none; b=sNIpo0k+T0bhvf698unNsjuU4O2JeQnFmpgEyXGe+46+Uyz4QA1DCHeVpojpa/PrKbIHzruKauToeKAFW4F1JKsCFpPBDsvvGoVEf8W5WqnyI+kKqj9O3NmaXT/jFSju8VC1hOaQ/ZnRw9klYsTsdyjqOOKqP17bF4T0Kw5uels= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782934392; c=relaxed/simple; bh=FUN+trAftQTY8ZpFI1i4Es/NPmL9miMwKLy7njqUDaY=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=lv0x8uug8KZrf9rs8FYLXORB899jnOuYJ5WcRlLtLT5HUQGNMQFLFovIW6QWWVssF0ib2spJ3BDDg/exGVPwBbHtphVugKBPhIGdvzqdLAS4U5W0xDhjGZ91DrmzKOkAML8SqqxQlpIQymBcXFZUUEITkcj6Kh2nGRp+e2vfEzM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=XzbIpABP; arc=none smtp.client-ip=209.85.214.202 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--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="XzbIpABP" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-2c6bbd0afffso21227805ad.0 for ; Wed, 01 Jul 2026 12:33:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1782934389; x=1783539189; 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=Vvd9sO5KFA4UCvVy/DPb0p6l2OFovCFuh6GrZNkoHew=; b=XzbIpABPzw891bJ2j3KkuzX2l3LjFAQaXXwR4xqL22Z56A8jjOV2yE0WC9Yq3hbJ6t mBLuHsU1JcRrXsX9A26ekw1xXHi8kqSBwIhWS2Gmjo7CPQx+KZSFj30oNvfdCgsXeIux hbovSJbfXEjvjTJuSe8/fzS5+Ht0yEn5MjrGNtAQCweBe/6IN3fjmhmdTohZrkDWTQKW PVEADBSLuVZ9sObXGxT3nAH4FZETN0h1gvWaQJDMPAwcTUNzCsPpitm53Gj5zfZpHzzt KtcS+DwLFjkIiXkGVyi9/eIT/dQLjn3L+E4GnHqSNnUoot9kZgEJNjOx38Psd+Qk0JC6 q99Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782934389; x=1783539189; 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=Vvd9sO5KFA4UCvVy/DPb0p6l2OFovCFuh6GrZNkoHew=; b=gLNsYnBWYrQGRExprvrZyp3pXnyH1Eie1asQNNv93V2e5/rC/PIFXH2gIc20qbyV5h dJYo4rE/KAXCHjtHRo1B8oFnkaEm6z0RNRf/nRWc82+ra5zErzoq3opJZo3+CLtlvtrm cdty1mhd34/PkC1G6h7HoWm/AvgojLJ98ULybHmDFbBXDc9RpVPlYK5llEm541ubu1Zq 5ooMdfFcu1wL8y1Dl28laiVSrOJYa8RzRwGVTXHNjoosiZBnXcWM83ksFNGoV+XAktr3 FYLtEOvhKSxB3t7fOFdHIhFfnlc4+xl/I0JOet1LuShEvrz8tCCm0Bq/pDvlRHHo+HMK nIHg== X-Forwarded-Encrypted: i=1; AFNElJ+FE0+BNNQM5a8sQbyJtU134hDHF2t/nBGVNVFtVxk/X9kArIOoz5/dSqGBi/LRqOe8utcqkwOab6M=@vger.kernel.org X-Gm-Message-State: AOJu0YwRxNKgF2qNjiOSmMFqxYf+JFrX5NjzTXlgqYoUcBZ06PpBvPZp wfj4lempihAdT89J42k1AQDO/nuN/rK8ZZvHqLSNaoq5318LnoLWB3lMY2wVnVjOnFSTqt0DavN yQJ3Kig== X-Received: from plho13.prod.google.com ([2002:a17:903:23cd:b0:2bf:1274:c8f]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:41c7:b0:2c9:c46b:129b with SMTP id d9443c01a7336-2ca7e67c028mr32017335ad.5.1782934388785; Wed, 01 Jul 2026 12:33:08 -0700 (PDT) Reply-To: Sean Christopherson Date: Wed, 1 Jul 2026 12:31:55 -0700 In-Reply-To: <20260701193212.749551-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260701193212.749551-1-seanjc@google.com> X-Mailer: git-send-email 2.55.0.rc0.799.gd6f94ed593-goog Message-ID: <20260701193212.749551-35-seanjc@google.com> Subject: [PATCH v5 34/51] x86/vmware: NOP-ify save/restore hooks when using VMware's sched_clock From: Sean Christopherson To: Jonathan Corbet , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Kiryl Shutsemau , Rick Edgecombe , Sean Christopherson , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Ajay Kaher , Alexey Makhalov , Jan Kiszka , Andy Lutomirski , Peter Zijlstra , Juergen Gross , Daniel Lezcano , John Stultz Cc: Shuah Khan , "H. Peter Anvin" , Vitaly Kuznetsov , Broadcom internal kernel review list , Boris Ostrovsky , Stephen Boyd , linux-doc@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-coco@lists.linux.dev, linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, xen-devel@lists.xenproject.org, Tom Lendacky , Nikunj A Dadhania , David Woodhouse , David Woodhouse , Michael Kelley , Thomas Gleixner Content-Type: text/plain; charset="UTF-8" NOP-ify the sched_clock save/restore hooks when using VMware's version of sched_clock. This will allow extending paravirt_set_sched_clock() to set the save/restore hooks, without having to simultaneously change the behavior of VMware guests. Note, it's not at all obvious that it's safe/correct for VMware guests to do nothing on suspend/resume, but that's a pre-existing problem. Leave it for a VMware expert to sort out. Reviewed-by: David Woodhouse Signed-off-by: Sean Christopherson --- arch/x86/kernel/cpu/vmware.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c index 0a3bd90576d4..5c1ccaf4a25e 100644 --- a/arch/x86/kernel/cpu/vmware.c +++ b/arch/x86/kernel/cpu/vmware.c @@ -347,8 +347,11 @@ static void __init vmware_paravirt_ops_setup(void) vmware_cyc2ns_setup(); - if (vmw_sched_clock) + if (vmw_sched_clock) { paravirt_set_sched_clock(vmware_sched_clock); + x86_platform.save_sched_clock_state = x86_init_noop; + x86_platform.restore_sched_clock_state = x86_init_noop; + } if (vmware_is_stealclock_available()) { has_steal_clock = true; -- 2.55.0.rc0.799.gd6f94ed593-goog