From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f198.google.com (mail-pl1-f198.google.com [209.85.214.198]) (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 C2AFE4A8C6F for ; Thu, 6 Aug 2026 23:37:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786059429; cv=none; b=d/EGIYrgDvKTIXwk0MRVsMSh01C9dLgX2yXzDfTvWIpZPQrui2aZHdl0mTH0ugecG542KXOwlpfIJpsZ4xrgux5Ue5rthIIzFoaID1dljGXvKG1ZroiIYMrt0SwGLBLYwxHwyr9kNkVdsP5B1gcTKnrvLGsptb8eakUP2u8qc98= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786059429; 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=gAxD1H9MWpa+5W5AQFU/yeouQpD6fBJ1RBp0XLoDoodMSHcox8CaGBtqT1GLf4MzHhfsrXOr7IeGRoQQwwPWnYyvNqnPO9xP4HpCYsDmm19d0aIgkzBAxSDj/etmxukR1BA9Man0wkx+XcDOGrsga/nLzAnmfJXV77g3NuZm/b4= 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=kt10IjlE; arc=none smtp.client-ip=209.85.214.198 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="kt10IjlE" Received: by mail-pl1-f198.google.com with SMTP id d9443c01a7336-2cceabd70f5so64713295ad.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=vger.kernel.org; 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=kt10IjlEPSYMAwmb+8BxRvPl3xR9fCb7HCn283P5bBBL99NGuZ8JwWOrvjqTLYyuE7 08v/WZP/kUv+rfr3lARtq/VUHbsYimPFyTuZMrynWxxn+IY1lAEN1yriQp4yicZ6rrNm ngH5+vAXawVbRGz7X1a01/zIN/rFnBAPgktW/c22V/i31Eh8au6yJeg9E3aVB8KNSy5w eF4xkFnZevrMdUg06k1wNsNHXumiyJ9Ph+JoxmUTpVEOcPd8FF6D4yGNnCaUdEufwZ2O xICH+Bd7TyKgH9DfkWpkEeLCwBhDe7PPzMkMZrXJgjKjxU9kUi2sQib1gXKggBhLOB6n yD9Q== 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=qvwz6M4KEeQdgKtdvdYBPuSvz1AmKnhgZWvQdiJvSULUDVgPkn9QUA0xIlvOLc0K7u vUeNvLY38XS7RShP5DTqI3doxpHMRQp/5D7ZHbLxvRGoPnIsqaD6CDyga5+aMG434kLP EWpXXis5Wnw8r0qszMU3Znr41wVyTjPwKhEnvJ+f7TzxgnHKQ8FkS7wWBxWGbYv/dp38 t8bG6MXj1YGRN58EZQ8lsoXIbPg6p2GLa4+qj5uYxKzjytbkhKxvH+AR+4mVyrMBIwev qNva7A1fZfCqaUwa6TkaP2H4H8+0Jq7dl9kFQGF+zOfto7uLTSkXYnq6RrZKkkbODwBT qGCA== X-Forwarded-Encrypted: i=1; AHgh+RqzSLECY0Y791h38Ln/rqimxkzQlX5+ExfsTsjANKVlVTKATz4a7+mC0jFliI2nh3PxAPk=@vger.kernel.org X-Gm-Message-State: AOJu0Ywv95BX0G7LO9W3xGisG8ThWyr4bvw93/NKNKMmOKOlhFZHcAvy L2avsRAp63N9dfiN2fbYtd+FSKtA6fRmcTq5Zsas81UaEWszeYKfI+/2JKMUVEgGTCS/EYy8uAG ZUyRK/Q== 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: kvm@vger.kernel.org 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