From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f202.google.com (mail-pf1-f202.google.com [209.85.210.202]) (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 0DDB33E1228 for ; Fri, 15 May 2026 19:20:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778872851; cv=none; b=Dq4hmRF1JF0h2lyIuk0mtcCHa2ochgfOVNTlobI8OObAVctHx7Ws3Ncsbot1RkB10xGdJKE+8I3w+OhOpmSkzI+QYbofCFmZAhEaJTKzzWOvFCDqcAeFKUkZdNt6D1Mw5zKcnIpFaupZ48M7P3LaefOqJv1PDY3n0qRPMpxXcgo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778872851; c=relaxed/simple; bh=7t7bZAkjWH8tEuvlMroGRphDuT5a2BO5RqjwXybBung=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=gY+xUOqSW7FtPCl3k4ws6qmMhkyU2R5plKtFMNvQmEGGoKu6UbqzWpguBDXgXo4EWniMs1QwKRZUd2I4NN8ro0eW4BG96KKXec5V8BJc8i2uBZFHvULThJmTlX6ERv5qcr7WKr0IkdpcvX7vwB09nBE3OUYxCug2ea5Gufos7RQ= 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=MQKdmMYz; arc=none smtp.client-ip=209.85.210.202 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="MQKdmMYz" Received: by mail-pf1-f202.google.com with SMTP id d2e1a72fcca58-8353df9bc7eso223282b3a.2 for ; Fri, 15 May 2026 12:20:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1778872848; x=1779477648; 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=c0VSXuwvwTL0EdvBxlPRCLOC48TzlA2S3UU4EaITdRg=; b=MQKdmMYzTBG8D2ABaPQCcAEXqkCMCGJv6YwKGlaX17DMGnVCbdP3MUgauOOEQVKXMw A1acNcHqJLtVxzGoElkRdW00I+B6Eq/ogRlIhwAHxHQBb7DI7LU0YLJhPBCP/Tfmqlbq qdX76nD9qXo8PynEjKxwaLLRclGgRG+c8tzwVHdcQHcb5Jr9xZY1vbBqM5EfNoBaVDsQ 8GTii7EzsxR8ngTFNT1kJRBts7PgUylrNdnGQAyzy/J934KhT7vEkfCcC+4HesscZh29 66XT19rx4KZdOoE7LWfYTKMlNy9umwj4UPDZr0Bj9VjvIWedfr6+hPzz4WF40enA78Ce UBCg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778872848; x=1779477648; 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=c0VSXuwvwTL0EdvBxlPRCLOC48TzlA2S3UU4EaITdRg=; b=jft9ixxBn51cyG9DaYB5bZe07X3QbI6lG5LwgXLBqhrNoje7nhIfXUV3F7DfOEFYhY wb1tCZJCkGqBEIYS69yeULz+ansZ67djTHQ1Fmqsta+YIcIrqns1JMj6HzlRR0n7QG1u tWKzL8pdjTjGPtTl7153ksokxWLSwNh71Lkswh0HTx7AcXsgW78sxv1gAL8frgyPcrfd du/L15Hr5fDvYw8XkHCFZIFqgbgwHRgnSPEqsm2VOOOI6HmpQgdYTVSxCH023orcUmZ/ rQwDKG5yxp/ro5sRsqB39QoHUGzOxNX4Bw1eLSwX0wHOpWBOZ+KO2XMYy5sXjXnZk1gs makw== X-Forwarded-Encrypted: i=1; AFNElJ+4hNKDnKxKBR6jBqyp9Wh+8JhQT8VaxWv+XKN0dg5UJhUsbS8zswB6Tv00Rf8qSxn+ldxIwRa4CR3VtNI=@vger.kernel.org X-Gm-Message-State: AOJu0YzVLq1Bx8L4+dXoFmr8vC00IpTadfKUGf+O8Aoy3l2W6jbR+83k EKRa8pScj5aONk1k6ev8qlAyWcsMwBSItSXKThcMWcjdba07TL7xAEuEuMMoLSqnQqzzbNMltDE BJUGE5w== X-Received: from pfbff26.prod.google.com ([2002:a05:6a00:2f5a:b0:83e:dfc6:971]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:1908:b0:82f:50cd:e586 with SMTP id d2e1a72fcca58-83f33cb2c40mr5886442b3a.13.1778872848066; Fri, 15 May 2026 12:20:48 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 15 May 2026 12:19:17 -0700 In-Reply-To: <20260515191942.1892718-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260515191942.1892718-1-seanjc@google.com> X-Mailer: git-send-email 2.54.0.563.g4f69b47b94-goog Message-ID: <20260515191942.1892718-17-seanjc@google.com> Subject: [PATCH v3 16/41] x86/vmware: Nullify save/restore hooks when using VMware's sched_clock From: Sean Christopherson To: Kiryl Shutsemau , Paolo Bonzini , Sean Christopherson , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Long Li , Ajay Kaher , Alexey Makhalov , Jan Kiszka , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Juergen Gross , Daniel Lezcano , Thomas Gleixner , John Stultz Cc: Rick Edgecombe , Vitaly Kuznetsov , Broadcom internal kernel review list , Boris Ostrovsky , Stephen Boyd , x86@kernel.org, linux-coco@lists.linux.dev, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, Michael Kelley , Tom Lendacky , Nikunj A Dadhania , Thomas Gleixner , David Woodhouse Content-Type: text/plain; charset="UTF-8" Nullify 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. 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 b88d9ca01202..b5cb66ca022b 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 = NULL; + x86_platform.restore_sched_clock_state = NULL; + } if (vmware_is_stealclock_available()) { has_steal_clock = true; -- 2.54.0.563.g4f69b47b94-goog