From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (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 382E753E32 for ; Mon, 19 Feb 2024 21:43:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708379036; cv=none; b=agj0tJK6y6C0w8AWRsYCzIluCVkylN4xHVjqmf9EkOpFRTcd6RkQGjXUFkIJ2ZNhpNNbPob38Wg6btjgUqqYyriWx+1VuM/Mbxw2y+8YxgeUugkvVORWXm4mwQWWUNtvTy5wc6PANZiXyJfCjA+jtwwtkGGGd/nf6ARU3uK/1no= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708379036; c=relaxed/simple; bh=k6LH3b1KRcD8NJGil47OnFJ3hyweLeYZpxuRnYRLbos=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=CEx+qlKFzjl5Qwm+nQtbytx0pYxUAtfx4bt+TJ55n8eah1LIvaGlaraIOGmjjSbgr3RPTlhwYStSfT+ylM3PQClHml+fj2AZCYs3unqBHA7foDscI+6p6boe+kd0Fhlh/9KS+HSLGgOmDREGJ0ynLhTN/eh4X7V1Kuc8cJESFvg= 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=VfVfn11z; arc=none smtp.client-ip=209.85.219.202 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="VfVfn11z" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-dce775fa8adso2611880276.1 for ; Mon, 19 Feb 2024 13:43:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1708379034; x=1708983834; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=QIr2v00MmtLW5AiJLj4vFJLvOqk80nsA5VSLXwCEAuk=; b=VfVfn11zCkinb8Wzey0w02G6cMocpi+WxyrRxeIAkT2FuqO7M/aDfOBzKS8qI6Pj2+ pG3HqDYfRvVTPKekkE/LCcfuZeC6ll2HUGdJQJs0bnknAMdUoLuGWzuCe/G4i5Hcyyrf NijeDmRRx+W9vF/X2+HHVdU/at6NkW44GnrCA+Rd1Xs53Xb87509LFeUBRKVz08U19qW CcywW3gU+Of9EPzcR+C6RG3BOpBk9bYQ8v/dEeAiiJY47zFgbkztr45rI3ZMNCUrr7gO hWWMtFL7lSGZS5w9xYdBfvWEUG6pfPk11Djgt6kVNzMsNC4rzGHMTguBSBiszBwufeVd bm6Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1708379034; x=1708983834; h=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=QIr2v00MmtLW5AiJLj4vFJLvOqk80nsA5VSLXwCEAuk=; b=no7VTyQLZ1ofV0RFxKXnsjiApC9+LzUVyVWSpxGCZtW1Nbo42O5W7rZ2cPiSYbnd1t Pv2HY3SfAoNRyef4mGjykTSzsdnBu7J5EbxXcyaPe1Guf25wdQCfkHRaMvD52TIbdk1E KcKckQci7px0dohs04vC5C9x2ZqA9tD86fw0EICaQApv+sVDiiGCJfbxWxul7HVgfyye sRNHId1HCSmld8HfTyCCekjuzS3DQzDbjdUB3oYOt7cDfqGSuY1ZPlkKlXmcumUWXqNb gw0qj+ygGk090nZ/wq+6asV3whOZvgHqetUyegj5YLIo4ApMmL2yrbP7twqvVax4ztsP PYYg== X-Forwarded-Encrypted: i=1; AJvYcCWoehE5Y1j6XFIYecwsy5nfHSZVLNjRVOwXPzYay7wvFU2b1iw+6e0Z3KhxJm2ziq5vpF8b3+ajqeHmvU9gq8eYqa7qmni993E/Sg== X-Gm-Message-State: AOJu0YzeDKdC2locFu8RSAcyYN18L2KlKPO73c8Mw0SqsaZQ1vDLTVMM ptH1Z6wUi93yiOdDL2XkgyPRM0e/7JAahnSs5m/rd5YCNZb12Ip5wT+Q/bQOrDeILcfPFsPwUeJ WfQ== X-Google-Smtp-Source: AGHT+IH7o7oqW8IXOLQwhiL+D+fr+M7XPoB0mGCnvWQZj4Q5usQnlETlssOWLw0ZF0bnkI2bqi3OkZN/zQM= X-Received: from zagreus.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:5c37]) (user=seanjc job=sendgmr) by 2002:a05:6902:705:b0:dc7:53a0:83ad with SMTP id k5-20020a056902070500b00dc753a083admr3628924ybt.5.1708379034234; Mon, 19 Feb 2024 13:43:54 -0800 (PST) Date: Mon, 19 Feb 2024 13:43:52 -0800 In-Reply-To: <20240215152916.1158-6-paul@xen.org> Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240215152916.1158-1-paul@xen.org> <20240215152916.1158-6-paul@xen.org> Message-ID: Subject: Re: [PATCH v13 05/21] KVM: pfncache: remove KVM_GUEST_USES_PFN usage From: Sean Christopherson To: Paul Durrant Cc: Paolo Bonzini , Jonathan Corbet , Christian Borntraeger , Janosch Frank , Claudio Imbrenda , David Hildenbrand , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Sven Schnelle , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , David Woodhouse , Shuah Khan , kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux-kselftest@vger.kernel.org Content-Type: text/plain; charset="us-ascii" On Thu, Feb 15, 2024, Paul Durrant wrote: > From: Paul Durrant > > As noted in [1] the KVM_GUEST_USES_PFN usage flag is never set by any > callers of kvm_gpc_init(), which also makes the 'vcpu' argument redundant. The changelog should explicitly call out that not only is KVM_GUEST_USES_PFN unused, it's incomplete/broken (which is also partly why it's unused). Without that information, removing the support looks like a somewhat arbitrary decision, versus a deliberate change to make it easier to support the gpc code.