From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) (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 C9C7A420E69 for ; Wed, 1 Jul 2026 19:33:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782934391; cv=none; b=ZTM+XkacrhykIuDejgtbStFar4HePQ3IScn5Z4lhC9hkPMAoOnWiciY0w3pOT6YyHRexDTGF/LV61VkeDVgLz6ub7Cp7jmsvcp2xg+mYH6WJIuUY8mGTbuCAWQwTEgAgskX9pynUHtpqGTe8WqN2DQmmbVkBfoH/iYhOQN0G5DQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782934391; c=relaxed/simple; bh=FUN+trAftQTY8ZpFI1i4Es/NPmL9miMwKLy7njqUDaY=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=s2eGbvxodaIctthPWQPdL1b3TggZN5eOkW23oy6Fmk25pf6KSlrwd9W7A/RSDtiCH+t3AlCU/n7ee75jZfpaxfMmBCIud9ELLqdMLdn6Q05XTeCb5FkY8KSjKrgMId46JQngYIPOFGG+HbcaZpoLHgLm0X1g9u8vMgVxir/i/oo= 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=da3sYrZH; arc=none smtp.client-ip=209.85.214.201 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="da3sYrZH" Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-2c80f89b64bso15751825ad.2 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=lists.linux.dev; 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=da3sYrZHuaiGu2GGX6GAktEDrjj48fbFWC02kIPmdIQcKcIHYLuNmNurhS6Muyh47J /YRM+HbNHqQjZE1qBjpe4kYCV61/UG+oYjL2b/l6E5ZRy6K9CvM4Pfayb1MFgopXbPSg uZr/Leb7vXZPv1j94X8cn1B2S6ym7azOCSvABMwQHDQzlqt6ZRNBsyStr3KgvYJ+Gs+G ky4vgwkm9Ss8LzK7faHGfI9Ch1J8U9mCSHa25A84x5SnOL5fbm00s15xS+Qq4Q0inJAk gG9qj005OlNsHLxY5wIDGY4cBirL9rL9liyH+KdUvme1hjzyz9pLxr0MZcYNtwNzgpDH vzwQ== 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=X+FoO2ljk4sfH5fXek8G5zJ1QjKyGOFLflfYYm5kmaAcE7IEJMiabH6D76mbYWTb1J +UOGP3hRkaMmFU485uDeOV+5yT5gTcJd0Rdr7kM47HNKu76rEK1CWca32QrdmXgVXu8A 6ZYLkz2cqF8jPyIJJjKIOd7bmTmx5WYVa6kCmcAwYxld816L/9+BZuALCCLgxn/9SAFO ZXIBfsnTn59jbTzhAxVsgWfsaG+rGVPiHY7w9x87xpyUTKx1yQi1IqgOwS9U9DCy90J/ 9euB/Pu6BnsdLG+mLTqdoNYxRggKETsNgTtbRiAqKDLI+HNtTXkhcXwUiruLq3nNqjiA kwaA== X-Forwarded-Encrypted: i=1; AFNElJ984qbTMtc9hDZ2jcm6mD7MZCaswuHrttHHz4YKH4/DwGmp4DRVK+6rro0YHhFM0Z/ICZ32d0OXDjyv@lists.linux.dev X-Gm-Message-State: AOJu0Ywo54CXUD13+x8VGZlCL4NfFttlVXgf4O4xfUkajQUyhoYRP+qf PV2ftvd3YaA5IWFDjq9dkzNl9754wviF4PXxadq3PySNuJEWdMDSJi9nPquC/CoS7aUmv++iytD 7ts0qRg== 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-coco@lists.linux.dev 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