From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 078A41D63E4; Tue, 7 Jul 2026 09:16:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783415786; cv=none; b=Gw0mSAZocimlQZmM8pHt/DJvRGa8hqhHBfScfQJ/MHAxBVtUrmmdTfeA+Y8SyTBg1x/xFCyefilyOisku44nJp0HwHlfHG3VySzBqmmLLA+HkLqkY4MmmyDGMkLfapWujSKrSvUJZ8r4UsV6TuV4R2TlgQyMFE2grdq9Z9Nu4QU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783415786; c=relaxed/simple; bh=6CxTm5CQJRWizY+bQkG2GRtEXkPbb35miOQMP1VcvQs=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=qPcYULZ+SlnM439Cp1H64z4m3tXZljtKKYwNtIONCxtG24nlw0w9yUnBoAPk1sXPPRJ/6K3gk2dO74xYsyWow9dfYBW/+osZzOnu+eUSCRuMhHbCmdPqhUw3HajHBMss8ZfdvcAKk8Q9er1H2dzp8Mb+8xsiZIUI/IL3D3ONF+U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=WWb1rALi; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="WWb1rALi" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=6CxTm5CQJRWizY+bQkG2GRtEXkPbb35miOQMP1VcvQs=; b=WWb1rALipcTiTmbq8tewQHy/MU K+Xxc0gqOnOA1RXaJm5i5vhTCRz0mi0orbT2FufyGyMxmuzxJYIjo7mLMxn6W7ZyBuPQ8jpnl9wk8 O04tpficvR4ryiwPh9pmTMA6wI7jvHUsK1mqKqq6dMFj+NKCo3XPwKQAV62JGj9u883xvYYAPIY3h E/UegiOd37SC9+seMKgZio3JYk9w938oUpY7FWHbLF3dTJjKYP0BHm6XbBVHE3e/8bMnx3z2qXBHC GUsBGyXueEzD6qteyKzg8jXMviOK3CVAFdKT5qYTjAmuc7vfYFnuOAJGYHF3c0dVsPTK1eOxhNuVN 4TcqP9xQ==; Received: from [2001:8b0:10b:5:7a2d:be49:1d8:dcc1] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wh1ud-0000000HVY8-1DUn; Tue, 07 Jul 2026 09:16:19 +0000 Message-ID: Subject: Re: [PATCH] KVM: x86/xen: Convert evtchn_ports from IDR to XArray From: David Woodhouse To: Furkan Caliskan , linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, x86@kernel.org, seanjc@google.com, pbonzini@redhat.com, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, paul@xen.org, xen-devel@lists.xenproject.org Date: Tue, 07 Jul 2026 10:16:18 +0100 In-Reply-To: <20260706081311.13633-1-frn1furkan10@gmail.com> References: <20260706081311.13633-1-frn1furkan10@gmail.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-WWrbmVq6ZZZ3yNAFmU9T" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-WWrbmVq6ZZZ3yNAFmU9T Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2026-07-06 at 11:13 +0300, Furkan Caliskan wrote: > IDR is deprecated in favor of XArray: see > Documentation/core-api/idr.rst. Convert evtchn_ports accordingly. >=20 > kvm_xen_eventfd_assign()'s single-slot idr_alloc() becomes > xa_insert(), since it was really an insert-at-index, not an > allocation: -EBUSY replaces -ENOSPC, still mapped to -EEXIST. >=20 > kvm_xen_hcall_evtchn_send() drops its explicit rcu_read_lock(), > since xa_load() takes its own RCU read-side section internally. > evtchnfd's lifetime is still guaranteed by kvm->srcu. >=20 > xen_lock is left in place: it protects state beyond the map itself. >=20 > Signed-off-by: Furkan Caliskan Reviewed-by: David Woodhouse Thanks. --=-WWrbmVq6ZZZ3yNAFmU9T Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi 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