From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f201.google.com (mail-pf1-f201.google.com [209.85.210.201]) (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 CB2E4428D1A for ; Wed, 1 Jul 2026 19:33:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782934398; cv=none; b=Sd+MeV30e7F49yR2GFx3mzqzJb9jNS0LCoqfuM24Iz4vanxx28wuuyQEH2NigP9nKs/pZbkc05wE8BXxfFjcJl0mhxkYRvEGZgyQqINmnTV5/SYGag00rdYnvFEGeJBGo1VC2f+5UZ3Ik5WN7z1a7TUAZPYuABSxTvBHNA7nxDM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782934398; c=relaxed/simple; bh=uS9BChC7KgGK2M+8u75Q9Ryt/QRAbZtmL5i8BGg+y40=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=bIDr8GAeBqObmZm+ReZpq9mXtYUg6JS0Luwg2sw6g6BEp/mLqkRHonS69PXo7H8MS1bkxhPV4yPrRjkXRHHCS3TujBNekkFvgdNzP2/hnv8Dy9MmDU+yVjz1148rOaK7mM4Cj2iGEb0mYQNbVgUY9A8tgjF7QJgb3YrWHEmlsNk= 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=CnkMyXHp; arc=none smtp.client-ip=209.85.210.201 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="CnkMyXHp" Received: by mail-pf1-f201.google.com with SMTP id d2e1a72fcca58-847c3a12ce8so532788b3a.1 for ; Wed, 01 Jul 2026 12:33:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1782934396; x=1783539196; 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=w419X+lYiD/kBIvhKaeAU2oxypXcdz+V5rg+/s/ZS+Q=; b=CnkMyXHpNTDadvB5Mlfx2LQ25bo47G4xKx/c45Np/Hm51F0cVaCjqhMYGCtY1/PULc kD8LIj6H2X2BDjee7Gwbut23NxKpj4bpIGOVKmCIbz57EKehqOGgWUB8b5CJl5x3EQlS BFuvVtEM6eJsYBe4GBgwL5zjbnCcwxqzfaCVILXlt3fu/iKUjVdj4QqhK6dMxxoBNjva co6MwnJNyvmTDMCAM/DadREZUkuBHiGWpev7akTe42ayqx3Fw3yvxR+VzZPxwoREkc48 odpLvSPE0v13V5HEehL256LmWHIY+gBVNTwgr8Ffc6TgXSD4fE5a/J+6Z+wDOmLK8XfU f9AQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1782934396; x=1783539196; 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=w419X+lYiD/kBIvhKaeAU2oxypXcdz+V5rg+/s/ZS+Q=; b=ZLjEmgXHne1TsSAFnuwDHHea3wX3F+lx8qOH1ZMkiFBV5o1+DvXnLXDTHwFNYD7d/n sTQqoNQOe+SVZpxoRVuq883sY1wDb6x+oD7B491OFvdytO2lOEnIPjmjIEzWz+P03KTH pDDKMkwR3NMRh/9uAGrpX9ZYkt89gQ/9vNrCVENB7wOZbkuidGdbbEWRmds1Brt2uXZm ObybyqHwsRMvzj5B9LK8fY6cVwdpD1dBm3Ov5np+H4Yy/mQRIAe9IELqTl0Z95kwVT8E pJdOJ0YD4EmvZ0khOfpYQE9UKevXafEoXua+CaDeTpZsnjwEaiU/MGBLhvWDszM929k/ FtCQ== X-Forwarded-Encrypted: i=1; AFNElJ/t7pRpNzZyxZeMJNUSZaIhAnx2UT1ckUAdJETkrMiPkH4Fmf2RdyVyWbZCPiy3ijXENQVQzGuSgebG@lists.linux.dev X-Gm-Message-State: AOJu0YxuuWooEMsfaCoKzmXAqYjBGXNJQmooktn6OYXJurutfOxM/9Tp LqhA5aASATloHZhPZYhutW9FoRHRfWFgfsio6vpMFTyWqhmQGazrtoxGx8lLAMME8oV4vGfBYFg cB+qBUQ== X-Received: from pfbdf8.prod.google.com ([2002:a05:6a00:4708:b0:847:a13f:28e2]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:a112:b0:847:8f7c:fa10 with SMTP id d2e1a72fcca58-847c0894ebamr2717987b3a.35.1782934395673; Wed, 01 Jul 2026 12:33:15 -0700 (PDT) Reply-To: Sean Christopherson Date: Wed, 1 Jul 2026 12:32:01 -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: <20260701193212.749551-41-seanjc@google.com> Subject: [PATCH v5 40/51] x86/pvclock: WARN if pvclock's valid_flags are overwritten 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" 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.rc0.799.gd6f94ed593-goog