From nobody Mon Aug 24 03:17:47 2026 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 EBE31428D21 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=1782934399; cv=none; b=k6JAYykVXFEUaXMIXTsuCYVBtTteyld6PH2JbV4jP8mKRYMH0H2l87mUmDYD92zi7EbIfKADQhD69DmMsQq6WRD2xjOnL0nUZE8XTjEkpVpCQH+Pi17R860pOnkNH7TJuqP6zrt0NJZdzQ1EUtl4blcBN3GxkWG9W72ruu8crwo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782934399; 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=m164jLZdyTxAFQj9eNDUXt1h4s2p55TDPmMBRgbUlBCBH81I12oXy2K49387O9x8Xv2cq2Awuh8vO7NzeDYNK20Zb4We8LXsVe1bwP4Hju1fZepEe1to/iHwbA/LIRjbLpczbjG/8wz0gTTUoEOUp1xGiw32l6dfTvNZ33L5DVI= 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=CGRt9Qfg; 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="CGRt9Qfg" Received: by mail-pf1-f201.google.com with SMTP id d2e1a72fcca58-847ad67cc51so1165140b3a.3 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=vger.kernel.org; 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=CGRt9QfgbZ4A0K1KvEd7oB0E5MclUUrNEZsph5oNIYNfP+sbjSBR7+iS1jJR01CMix 7DMJ8JYtmzETMNvFUfCm5Bf5DrelvA6Q1iXc9mNy8yZTdw0k7OmfW7SfWNTGeWBLEI+Z 1Js0Y7t8hNHAUOAOILmf8df3Hu4Aojz4YugYTVDBEWMqDcwPjReBlaTbeYUB40PV/v8j B27FjEGoE86wdAnxLcd7nxkbCDjrdZdc/dehlitFIQdvVBYrFX50fudD0mgDZ7+K7lQI mNT+ZoyAy8DUwx02z8/hNM0HLgdyUw8Lijaj6zjIv52m5hLawcNuiNW31pqeozVaP+YA L+3w== 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=cQMKtmgkOmlACWtcHRZULx35xXkNjdWkDzxz9n6ijRiA1/5RhVyNnVewhrmijTh/ef S0p1hU3pb8ApsMDkyChsOHSgh4hpNVvMJGgnuK6UhjzX+sK/5lfDjkZKvvwRGfqcKfRG beKGFFAJNPN4FSiH0/6fEEO7zphC0zuNsoTNgjuM6vCUfJSE2/mkohSRILEBjJdLxdAv syWxlj+JcJXahd0zKbmV36IOWombSqdSFpPMsNQGsJmxwao6C8C3JE5QiuA5ch3Brufi gmTkUhsvuHpJ4lbZw6ldWgskcETkCvZoJ8LNdhiLiq9VKoHnpabNnQQRoWqlIbT7sBov qm0w== X-Forwarded-Encrypted: i=1; AFNElJ+x7ahekw5WLWoHxks8+/MTbklxVBdx++LuDa6x7hDmWm17SDzbQJp1meBY+E/OwWyPvT2CimkNRQ/Fe4s=@vger.kernel.org X-Gm-Message-State: AOJu0YwCuwGxTBI4+7asZghn/bwJ2Ug6LijIC7jeUN78KqPodxn2x789 viyPl82yVBnXfIYFwwoHIwjcNiBj6Nc+S+ds5x8xfs86jwQ4b1vBI+rxTSaam6fKKOPbduz7Wp7 o46KvwA== 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-kernel@vger.kernel.org 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-Transfer-Encoding: quoted-printable 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; =20 void __init pvclock_set_flags(u8 flags) { + WARN_ON(valid_flags); valid_flags =3D flags; } =20 --=20 2.55.0.rc0.799.gd6f94ed593-goog