From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f200.google.com (mail-pl1-f200.google.com [209.85.214.200]) (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 C39DA4A8C72 for ; Thu, 6 Aug 2026 23:37:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786059430; cv=none; b=Vxv2jTa891w4JwE/1jZObOv+s42VF2XMtuLqHJPosApr8Z901cDd+JyyDxgNoshVS/Zn1w0SLoJcQbrvjOLKz/7ZlCN9IL72zlodPqMqUkXscPM8cdR1cUWkSWJoPojBE94GHltWMn5VJWCdYWDj6r/DSIe5O8mPFSZPyTVxwtk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786059430; c=relaxed/simple; bh=oL4k89x+CtNtrtSN/chXxcI7VW6e8o1GiS+d7EOGh0Q=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=psIdl8hqKjn+Xr/PjpBuNPbVABrB4P0Y2yFDE+9Bg1c14sJkNEpI/uf47e4GIo9Gqc4WXfcYnF0J2DVwXY/6BFLKsGLJYd1hB/QCkvpog8q3J5obvpMW4/bQ8LGwAQo/rEzBRAviSDGHAmMcfd88PAf45YwWrFbk2N8CK0knV1o= 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=I4VMfOVK; arc=none smtp.client-ip=209.85.214.200 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="I4VMfOVK" Received: by mail-pl1-f200.google.com with SMTP id d9443c01a7336-2cceabd70f5so64713255ad.1 for ; Thu, 06 Aug 2026 16:37:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1786059427; x=1786664227; darn=lists.linux.dev; h=content-type:cc:to:from:subject:message-id:references:mime-version :in-reply-to:date:reply-to:from:to:cc:subject:date:message-id :reply-to:content-type; bh=f+UXuTD6z7zajVoSPLixW+N3kzbQtDvz4+hCO4pCJ+c=; b=I4VMfOVK5Y4sazEU3PAZSJ4ApLURXNbeGleCJfLaiHzdWMPeCnHLYzSBdZcFEsCd1Q vNtw1CdTkrekUbefv06J9SCDHl9X3w7zq7E5AHyYuklLgWVz0xewyi3qDynbIM+4hNnT w5f1yBKyiblClnPt8j9TcVGP1DsAYHfe1ffw0bxjRZ/mjYTRNSCxq28OGJzbeSDTWh1d pt16N99aQTsxDjaG4l7nfwxu0pEYCFJHCVqTbKUDqdKlYyka9R0qpp33nttdNhKg4FW6 98/BZ2pU/z7Jyo4IgO23uBbMmm9ndIuHq0cPDJS5c6lrJY1sh51oUlwd0TJeUMMqjzRL wQfA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786059427; x=1786664227; h=content-type: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:content-type; bh=f+UXuTD6z7zajVoSPLixW+N3kzbQtDvz4+hCO4pCJ+c=; b=BXW1ZZGsVbY6N5FPbE/0vCZ/QdwzOc2ID/7TwnMbpa92IK0d/XM/6ycaD682EfIKLL hGaYQjfbMj7i3CYSUFabUJaPu8BLDWFjQtu0rgO3m0NaVd+rlPXQu/Mu+RwFgOS2983Y LP1A7A+xqeWh85E+rdwuslmas8COerVlSttIIA2kEUXthPSN9wU0lnscStIY35oUxCDJ rvvjD+dMixsbkcpaH7N2SFUb9YE6CyhX7UkI8rWCWzxffx74GHvfRMxPQBrff79pP4R0 +jC48fNodtlz2PmKGVzhcFO7fTu0rzxpFrdFMxeH1B5HJGKMxoJq0CdWYMwa3FFmS3o8 9tgQ== X-Forwarded-Encrypted: i=1; AHgh+RrKlS5NLZzeCXRZssHM1Se2FHyHCc+tE31o7B1Tpq/y3uCQCbeopskaWzp7fCoGis+FFydRdYFhCk7A@lists.linux.dev X-Gm-Message-State: AOJu0YyXRx18IWEkx9KWY57/0dNHDPDlwJyJ6Ri6T4JzAiD5PfxdFI3l Qb6cASYUHIRm6vQq9GwwZuTX4EX9Z2edWVkKFA3Ee40wcG1fHNld3J52kkkhTt8DvN/vXjy21G/ +thaRxA== X-Received: from plbi11.prod.google.com ([2002:a17:903:20cb:b0:2cc:6da3:442d]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:f546:b0:2cc:aa36:c046 with SMTP id d9443c01a7336-2d0ca77ece3mr197228075ad.14.1786059426608; Thu, 06 Aug 2026 16:37:06 -0700 (PDT) Reply-To: Sean Christopherson Date: Thu, 6 Aug 2026 16:35:51 -0700 In-Reply-To: <20260806233609.212337-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260806233609.212337-1-seanjc@google.com> X-Mailer: git-send-email 2.55.0.679.g6767b8d81c-goog Message-ID: <20260806233609.212337-35-seanjc@google.com> Subject: [PATCH v6 34/51] x86/vmware: NOP-ify save/restore hooks when using VMware's sched_clock From: Sean Christopherson To: Kiryl Shutsemau , Rick Edgecombe , Sean Christopherson , Paolo Bonzini , "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: Vitaly Kuznetsov , Broadcom internal kernel review list , Boris Ostrovsky , Stephen Boyd , Miroslav Lichvar , 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 , David Woodhouse , David Woodhouse , 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 cbe8b59ab79f..94fec990a02c 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; -- 2.55.0.679.g6767b8d81c-goog