From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) (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 CA1063F9F21 for ; Fri, 29 May 2026 15:08:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.216.74 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780067293; cv=none; b=FAtHr5wCTmg0fOMijFCitm6MZ/VweyWuLP9461c5Io7QeGSgxpQdQyU1KB5S475n3aBuzV4lkBtayzIX1TI1cQcuaFIcE3yAE92EftdIZUJAzAVj7Q90uC6HEo1Ir3rBOKjsmSfj3CYHMWiph6TXrBoz8q21wOrKtuvBo0Z9Hcg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780067293; c=relaxed/simple; bh=exJIaYP606/6I81t2u+ZeN9QwrdKHiAhDu05aj2jV5A=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=VfpSKBHbWJDbHdtvUL+pQVzpyLTmd8+rktFoA5ZhSj7Tvmm0trbGmkORLx+fKT7vo3jVf/d/rD46bOC367vZNhlTy4hhCk0WoiTJMKXVvbRbX5S0ZjiShd0e+sG0IV2BxyaE8H5540iVsYsiLUQ6ja5qke8w+xcA90vRDrHPsYo= 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=UONXSS87; arc=none smtp.client-ip=209.85.216.74 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="UONXSS87" Received: by mail-pj1-f74.google.com with SMTP id 98e67ed59e1d1-367bb9caa54so12862633a91.2 for ; Fri, 29 May 2026 08:08:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1780067292; x=1780672092; 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=0jsX4kmzCmqMaCGwN5oKHLOUS2DjjzJWXK44/xdBtv0=; b=UONXSS87awcnuG09vA8ub9onEwWCzBbbb11XZrPRjVfo696POo/Svj/idC/13W5Kfu TqN82eJlKgZ76CkVdzjbPkNceb+mtrci8ebhQsr3uhGemi8HMg1fa6wfBkw2ug77aRA4 ZRINvh5wgo8VpN9fEQytgmWyTdFOkrXqbgJh7/gQ54OCzoNRAB1so+W3ff6SW5YP5T8x rbDgog7F92wI9PHcVamwo1IuH7S65fdxSsAzSRH511YvltClYeKGBK0JJMfDm2WRQwa3 +XRhW10KH2DlVLoCxaqyfg2VTSvqK/gxJnUUqjv/FSwGCAkY/r54iyHGu0qrwY2tEZEv aADw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1780067292; x=1780672092; 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=0jsX4kmzCmqMaCGwN5oKHLOUS2DjjzJWXK44/xdBtv0=; b=E1UlGPMb5ZsPfGE+XzWPuu4RwhO/4zFzjVvksODhTnllOUqcnG59Aok7cgR42OOhXH BAZPfLQTPBnpJ9u642dDEHoWKQdVgULrkw9MoKox4AEeJ/f9M78S+I03uIAzK64/eOtw sl3Ma4QFPZdpC7WQS1D4wVssXyHnR1UVQjsehbZ4FYGc/ePRF28hH/2/ZSrSl0pat00B GLkhBaEcsKS+MN1iXxQ1OlVD5t6ujLX2JrsP5e59KkZXN4qlSmbJLy97eP2CuH42qNa9 h3LFQ1qWp+kV0n3umRi4Bx4LDuqRXdJfzCR4QJA5GQk97kq1gESCAHgtMrxj8OIRF4lf 3cEg== X-Forwarded-Encrypted: i=1; AFNElJ9Ht00QSRZC3nNgjLPLJzBdQOSEjkqfhZaDvTCKadSHLp5rA5A6pZm8v1/Dx5z6HDlniNT5u56kNu8O@lists.linux.dev X-Gm-Message-State: AOJu0Yxm0k1vNKCmHewwiZTAfpwLgfg2vKsgTh5HtH8PKwEFGJG+OFMg 2BaIBAxWznacBCw7HuxL3Ym2S/5BSHmA2b1gPk8+vyp5tf8ZjbjwmEpXFVg4tE5QJJzSR8lTtiK Z0i/pZg== X-Received: from pgvi5.prod.google.com ([2002:a65:61a5:0:b0:c82:2dd8:9d49]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a21:6b87:b0:3b3:d4a:793b with SMTP id adf61e73a8af0-3b411e5b284mr4378476637.43.1780067291927; Fri, 29 May 2026 08:08:11 -0700 (PDT) Reply-To: Sean Christopherson Date: Fri, 29 May 2026 08:08:10 -0700 In-Reply-To: <20260529144435.704127-1-seanjc@google.com> Precedence: bulk X-Mailing-List: linux-coco@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260529144435.704127-1-seanjc@google.com> X-Mailer: git-send-email 2.54.0.823.g6e5bcc1fc9-goog Message-ID: <20260529150810.714572-1-seanjc@google.com> Subject: [PATCH v4 37/47] x86/pvclock: WARN if pvclock's valid_flags are overwritten From: Sean Christopherson To: Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, Kiryl Shutsemau , 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: "H . Peter Anvin" , Rick Edgecombe , Vitaly Kuznetsov , Broadcom internal kernel review list , Boris Ostrovsky , Stephen Boyd , 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, David Woodhouse , Tom Lendacky , Nikunj A Dadhania , 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; } -- 2.54.0.823.g6e5bcc1fc9-goog