From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f202.google.com (mail-pf1-f202.google.com [209.85.210.202]) (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 89FA91F1317 for ; Wed, 2 Apr 2025 21:44:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743630265; cv=none; b=bEfIgsFbrbRgyu2BdZrfRgX+OEuTqEkTq3rMXx+wy30fbAqd0UcgoVSmaZYv3ubCDv+l4Bm0TbyMCqQfPYsbjP26VA90wuvtYd4m1T41TwHA/dPHihTk+9cKcL5fmZZ+qpBjqKiRoQpu4N0KftccAOejcsnG+agV9yLGYTCeWE0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743630265; c=relaxed/simple; bh=FO3SVeco0QFm6hyLBiHLk8AMw/7y51N+SIbiCXOY8yI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=pWqO7FrLMDi234+GnQZpqgsgpLSeJyKi9yJFyebwMOh9CiNg0THf2sfdK+FZg/LuD+6o1cks66c8lshgm2d7/gmncZhxESzwTwOcWGWTYc32pK/Vrbz2xCfTXM/u9H7MCet9FIi1gvYwX8Vcy0aGz6Dn+3JVV4IP9VBN7TZTEVE= 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=uwET3dMi; arc=none smtp.client-ip=209.85.210.202 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="uwET3dMi" Received: by mail-pf1-f202.google.com with SMTP id d2e1a72fcca58-7395095a505so184652b3a.1 for ; Wed, 02 Apr 2025 14:44:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1743630264; x=1744235064; darn=vger.kernel.org; h=content-transfer-encoding:cc:to:from:subject:message-id:references :mime-version:in-reply-to:date:from:to:cc:subject:date:message-id :reply-to; bh=5dc3S/NlQ1HoLivnHDrQdFtaRf+AOoi+dCBbMdqheqM=; b=uwET3dMi7X04arpId/FGZ2y/HJnOhexxSISUCkKksyeuBeADbyA85vijpNiUuaIYvU lwJW3QmE6WEIV3TgDdvGG3oAzBCiJXGfkQ8sbCEDaoTU32YkFWOmv1Bs5RgHuUa5doN4 3xsk52KHVGZi8Kr7pDpb+4Aec9/0hQjKab9+ycMsSjEMd2I4Vidzvl+2pAO8732dACUn rQXMCfpIJqm1uhAGm+/Doqi5gH88KcWxTUhdquvQV+muS0PdWEgmrM+jjp7m1FjjqNqu 1JfoAR6XZx1SA6qYdJ65YeVkHP/C/2u0xT6fVLR642iI7AWfSB+qXhNblORO6xBiIU3r 8L1Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1743630264; x=1744235064; h=content-transfer-encoding:cc:to:from:subject:message-id:references :mime-version:in-reply-to:date:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=5dc3S/NlQ1HoLivnHDrQdFtaRf+AOoi+dCBbMdqheqM=; b=v0tlWweZ8sIaPKqG5sL7AkQnqqwDrcWPX9T2FIWNOyzNIGNVQpj+0c93/DrdAkSTJd Aq1sf4gIWuEZk/Gvjf/JwKFqpoF2Rlm1FFG0LzXyrKXyd2jW7JZUP8yVUPxpP2dSpTXS V6tcgxITGa8/Vcpz2U6ojRCXPcmshsymBsirivUwmkZTBNCBTqVNfd0RmYRbBE550ux1 1gEgde/jeq0O36ttbzGInHOMK8OmoKdDYIzbRDhd5ZRL+/Nw2tauU9WxK0Czat4tb4O4 zLk7ywf8FBcqc+eo8YH0ITaiCbplKsxmnf9a+g2LLN5ioTgP1XC/70tFxO+G6RTnXTwk isjA== X-Forwarded-Encrypted: i=1; AJvYcCUvML5Brr0eQHMY7u3mKvx8XCXB5ax0oqBm1iJf+kt43+mgSdDVpifdkblXJ4onhU6jigE=@vger.kernel.org X-Gm-Message-State: AOJu0YwY5dl33J+Gbr/JB2yap/764WbCSCNYE621JGDA9NgdVXGyWqmp baDwZBAm/eT4ODtDWj1snMRSicbTUZ5pROtFgCerGVYy2pKyjwQOAGeYOtyagsCjWo30hIqzHy0 JhQ== X-Google-Smtp-Source: AGHT+IFRZiukULQx/2fLXpoCzka/CF3jla1TGJ8jtcm6RRL0keYWCLj/mfa9mFnxvbhxlAP78zp2a3oigdc= X-Received: from pfnx2.prod.google.com ([2002:aa7:84c2:0:b0:736:451f:b9f4]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:114e:b0:736:5438:ccc with SMTP id d2e1a72fcca58-739d852cbb9mr388364b3a.9.1743630263625; Wed, 02 Apr 2025 14:44:23 -0700 (PDT) Date: Wed, 2 Apr 2025 14:44:22 -0700 In-Reply-To: <63abbc66-b237-4f7f-8aec-e32ebf6c62bd@intel.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250318153316.1970147-1-chao.gao@intel.com> <63abbc66-b237-4f7f-8aec-e32ebf6c62bd@intel.com> Message-ID: Subject: Re: [PATCH v4 0/8] Introduce CET supervisor state support From: Sean Christopherson To: Dave Hansen Cc: Rick P Edgecombe , Chao Gao , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , "tglx@linutronix.de" , "kvm@vger.kernel.org" , "pbonzini@redhat.com" , "ebiggers@google.com" , "vigbalas@amd.com" , "dave.hansen@linux.intel.com" , Chang Seok Bae , "levymitchell0@gmail.com" , "samuel.holland@sifive.com" , Xin3 Li , Weijiang Yang , "mingo@redhat.com" , "mlevitsk@redhat.com" , "john.allen@amd.com" , Stanislav Spassov , "attofari@amazon.de" , Rongqing Li , "hpa@zytor.com" , "peterz@infradead.org" , "aruna.ramakrishna@oracle.com" , "bp@alien8.de" , Zhao1 Liu , "ubizjak@gmail.com" Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable On Wed, Apr 02, 2025, Dave Hansen wrote: > On 4/2/25 14:12, Edgecombe, Rick P wrote: > > In any case, at this point I think we need to either double down on pol= ishing > > this thing up (by pausing other work) and have a clear =E2=80=9Cplease = do this with > > these patches" request, or declare failure and argue for the smaller ve= rsion. > >=20 > > I guess I still lean towards keeping the optimization. But I do think i= t's worth > > considering at this point. >=20 > I'm not quite feeling the same sense of panic and some need to pause > other work. This is thing is at v4. Between spring break and the merge > window, v4 hasn't gotten many eyeballs, except Chang's (thanks Chang!). This particular series is at v4, but KVM CET support was more or less ready= to roll 4 *years* ago. I agree there's no need to panic, but some sense of ur= gency would be nice.