From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f198.google.com (mail-pf1-f198.google.com [209.85.210.198]) (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 428D34AACAC for ; Thu, 6 Aug 2026 23:37:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.198 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786059437; cv=none; b=GlEMqhvHOKcjUHkSeL9rtvBGNZgqHUgx21wNfuuBgXjut/TNPLUfsZtk4iJacXPae7V9kpaHPHJTdNS355tKnQ9TPXTj30SHEPklK2tSyVia2mE1SJlmbK9t74ag//+8e1srvwdZ79d/A4t1Bmm7y+DKnd8sP2QvTalWNW0PmxQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786059437; c=relaxed/simple; bh=atSdA44tQM5iL7i468JQE5pWUtYdZ9gHhqtvG2Zh53o=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=BkMCXSjVXzglbEA0YV3LIUXfC7Jup1MQmAdaNPwustfLY8UBYZiZbsqj0JXyAX3E0EjnULr87cHjh3L8KVQTydW203aRhrm1ykuffhUmNo3cugG64BRwm+dnlQn/TaDRP0hkuAjl5cjt6tIfW5fuTm4A7gQD9PzYtS8XoFLW3QU= 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=FccuUzN5; arc=none smtp.client-ip=209.85.210.198 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="FccuUzN5" Received: by mail-pf1-f198.google.com with SMTP id d2e1a72fcca58-8484b9fb055so6111480b3a.0 for ; Thu, 06 Aug 2026 16:37:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1786059434; x=1786664234; 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=gswAR/5wSepHR0W/S6/oLzBYH0wiOXioT7kjM1AQclw=; b=FccuUzN517P6dv1EScvNGgc/kZAicCrl68GSLp765qNQLHwOCDrpMqa688XpUfASXk s3qlCUW6FIUAulelGJrFXfC4OP7iFciVoKpphQC3vUwmiu95MCZBk1N7jljNMEzwb3VA caa6of+/YVNCjgHSpf8/UORwT1K4PbnQj5s+Ee4oBqJBEUTAZnARFUNFkO9KKxCZscmh RxAWcbNAfS8ARhUSRQ6e2QiVtbui2Bpdcnep7DaIKAMLANG8egoAUw6ClxpAQGSS+Scs Xe5o+HNHAQay1F7RMXHkpga3KB1bcvR6EbBERBjawzUjaMN4tjbXrLvZRDC7CmZNzDh7 NbKQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786059434; x=1786664234; 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=gswAR/5wSepHR0W/S6/oLzBYH0wiOXioT7kjM1AQclw=; b=MOnq9WjRMsSi8EBXVszA9IgTQgSCp8Z+gkL1rG842R6bkH9b48pTR4KzwHvjF7w0Sw hNCO8201I18l6lEmATRhn3L0T8PCT36vbKYP39irMq7eWMWhYQLXvpbra8Q7u3ifXY1L myn2Zw8R/gYuejAKM8QMKE2k8QrXbPnsik4oodptbTnnrdgYVqpO/4lXKcrNpdKla6Q+ O2oRupzK+AR+1zFLLAZF6snK3HlDeHCVgUb8NEsu2vtZch5NW80tKRMI2uImQ6fMFTPe nTXZg1lJDzdw1Z6WkCrLBPx4VNKJ/BqSQhq2Zwb06wgaYa3DGnQn0d9y54NpjTDY2x6j xJyQ== X-Forwarded-Encrypted: i=1; AHgh+RquQU4nVEWwHSyg83c2isD2Eh+SqZfZtXA8aPULeLxjBt+A33ij/Og8Y4y83YdLBA2MIve7tqcJkY9PVNc=@vger.kernel.org X-Gm-Message-State: AOJu0YyOPg338Y2N7LwR6cUets1PvAsX0sZI9tlFIYye4yfGr1MZM3Di 1PBJuVJfZ/qdaRnlUufFI7G/G7330yEQqYtDls+iWLMwqvSXjBTCnjDJLu3DmMozeJCnhpaERdR gg1+4NA== X-Received: from pfjt11.prod.google.com ([2002:a05:6a00:21cb:b0:84e:2062:2edb]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:9506:b0:84a:29a7:f64c with SMTP id d2e1a72fcca58-84f2de45511mr20003910b3a.0.1786059434181; Thu, 06 Aug 2026 16:37:14 -0700 (PDT) Reply-To: Sean Christopherson Date: Thu, 6 Aug 2026 16:35:57 -0700 In-Reply-To: <20260806233609.212337-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-kernel@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: <20260806233609.212337-41-seanjc@google.com> Subject: [PATCH v6 40/51] x86/pvclock: WARN if pvclock's valid_flags are overwritten 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" WARN if the common PV clock valid_flags are overwritten; all PV clocks expect that they are the one and only PV clock, i.e. don't guard against another PV clock having modified the flags. Reviewed-by: David Woodhouse Signed-off-by: Sean Christopherson --- arch/x86/kernel/pvclock.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/kernel/pvclock.c b/arch/x86/kernel/pvclock.c index a51adce67f92..8d098841a225 100644 --- a/arch/x86/kernel/pvclock.c +++ b/arch/x86/kernel/pvclock.c @@ -21,6 +21,7 @@ static struct pvclock_vsyscall_time_info *pvti_cpu0_va __ro_after_init; void __init pvclock_set_flags(u8 flags) { + WARN_ON(valid_flags); valid_flags = flags; } -- 2.55.0.679.g6767b8d81c-goog