From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 50F313FD132 for ; Tue, 4 Aug 2026 03:20:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785813658; cv=none; b=CbnzXPY2Vc8iWc3U90E+V9qLl5CbyX7zroEA4Qxqh0TGNYUkX1WUuxYLsEJjhwaYnQJc6qMYEwETMySamLaSe7GQh6JidUVKU5n6IwJuAqY6LA7H/gosaSnnFDlccGG7mj0uIf+bdyV6WrFuHrM1aBa5kqpjC0dUYWVoIKAGh4g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785813658; c=relaxed/simple; bh=tqZLOsTLaD2Vkl2fHPJf5w3iLf3P6mTDx2svcOIN6lo=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=JmdBHgLG/0RiRwkCr9Nu6gZoi1kVmEIIuKdX2mt7632oz03H8ILO3MOsvdYlLzfMnMnSUDz06o1YUMgDrLXwBsWHguPvLdO+pNECgPllqiBqpTuwdg9hNMmFcMM0705iicaQlqiXl405AC/xcuLutKaj9aMtjZhA2Tk/FHWQ2PA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=EtkyuhFG; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b=q8MqVcco; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="EtkyuhFG"; dkim=pass (2048-bit key) header.d=redhat.com header.i=@redhat.com header.b="q8MqVcco" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1785813656; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=En8P5t+/b7u5WFGgCY07au7/iBs4q0cXFNe6Tnkfb0g=; b=EtkyuhFG6ARiLAcq2saeyhjR4/GbjZUx6pw/gBmar6ScMsfgom9qGsP+VkqnqG2QRXlvAn 8arjzclLa4trzeXwuSo5Fc8jDBo9G3WSENYXy+64jnwSA/UJyWLwvtlNOZf90/I+uy1hyh 5fPj08CliIzw2ezjvm6rot6kxqR+z/Y= Received: from mail-ej1-f70.google.com (mail-ej1-f70.google.com [209.85.218.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-184-JGmDj-kNMvm0G7gMH60-Yw-1; Mon, 03 Aug 2026 23:20:54 -0400 X-MC-Unique: JGmDj-kNMvm0G7gMH60-Yw-1 X-Mimecast-MFC-AGG-ID: JGmDj-kNMvm0G7gMH60-Yw_1785813654 Received: by mail-ej1-f70.google.com with SMTP id a640c23a62f3a-c15fc5a1b7eso276085366b.1 for ; Mon, 03 Aug 2026 20:20:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=google; t=1785813653; x=1786418453; darn=vger.kernel.org; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:from:to:cc:subject :date:message-id:reply-to:content-type; bh=En8P5t+/b7u5WFGgCY07au7/iBs4q0cXFNe6Tnkfb0g=; b=q8MqVcco4PpKi51Xv3UpnUWsATDDMPaxkz7TU8ssjRqOoW4qdB3Wgi3C8aerlKSJmv TmyOKqRaepEn+s3xGYFzhqeeYagnG+IF9uYKZ4Zd8KhF4qESipMNyAY3DDGl/s3gzmHy 084LdTIVW4HfNO/JNVjan7+u6hzN3iqTd/YDVku/gTYif8e33UjncZDsF+r1kg9xO8pv PUnwexquACPLRE+ZF75RIC5jLXEXglUFcVXdCh0DwSy0EjUSEPPZek0Wrsh6x+hXChCd UolBsNvhzG9OZlRMjo8fXK8lieEgmAsKDjrOEjTaZnvGXqY9GlmT+zq29KUHZ5BcbA7V KUjg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785813653; x=1786418453; h=in-reply-to:content-disposition:content-type:mime-version :references:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=En8P5t+/b7u5WFGgCY07au7/iBs4q0cXFNe6Tnkfb0g=; b=Nmodn5m8M6nhzM5N5KOSPb4No/9jH+W9Vm6bMcgd5Shaw/uvfIGukT7hmiEXfVpI38 Kngsu1sXLk+Sy2C5FjEosJUSJi9YZHGVv39J/hFsfJi3S3udOYNLzime3IDum756b/Uy neBpO72smm3lCyCzcDtLu/T1hWVT6v7pD9vXVdrCAswjZ6RIaY2aqQhxkOhSfYtF8QJs YqIF039ABi2zPICWePocFN35tHRfrUhqlO5lXaY3Ty83B/cgYIDtjgGbVfBzVIa2+0bu cC6JzbqHkposRwtP2OWvm/aimT780pNptuIrrwDDYNWHcte7jXlx+n25cczaz8tI0Y63 Ow+A== X-Forwarded-Encrypted: i=1; AHgh+RqETU2takzSFezmaGZt67Gf164GIFr9KEHm2qJ9hGW3Jhemt66jykPLLQ+zfwtYp/wxofOWrK2q2Atdu2g=@vger.kernel.org X-Gm-Message-State: AOJu0YyFwpXYnO+2y+agPyz0By0/Goj/mR0bqIvuXkFZYTe8gmJi09Hw 6HesJVi5djlhSAtSus9dFY7SwhTaxAcYJxTVuuNg0Fa/QZKlarTeF+UM+h73Buwdd291e1dDweh PWyA04yY5z58KeLKBn2QEUrc2J0U5a4Cz3xn8OLkejve5gpX+oaw0plc6FfCD0SykQw== X-Gm-Gg: AR+sD10+jGzlOehM05+iWsExNb08pYlvZOuudQTAZZ3tZbRYW7/P+t6jxuPmsolTWqn 9geufBp622+/fVYTVSIvQp4+kZYmFhAGbZe1F8MbK4+LPnmNSAI2fXe4WKDG8YgqGTscYLcJMBD y6v/dwGb2QAxt68P+oZxzpp/UHLlLSJ5rxAcjV91wL0+weuyHg5f6LA2ivu8e+G7hd/uPtjPzEV QEbVeP9t56iXdniUalp1hlMo+pDyN7IuInmYeR2d1BtmOzROZNJVpShn5BuhuAzo2AlcVCQGY+W doRfZwYTBa8xuO/A14XAXtHAhtO+ed9i1mRSUhDtVk4kQZIC4/ViTY5AaKwS4jxhslzf X-Received: by 2002:a17:906:fe49:b0:c19:4ea0:f4a3 with SMTP id a640c23a62f3a-c1fe8109d66mr946358166b.22.1785813653537; Mon, 03 Aug 2026 20:20:53 -0700 (PDT) X-Received: by 2002:a17:906:fe49:b0:c19:4ea0:f4a3 with SMTP id a640c23a62f3a-c1fe8109d66mr946355866b.22.1785813653094; Mon, 03 Aug 2026 20:20:53 -0700 (PDT) Received: from redhat.com ([186.247.166.67]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c1fd3c5b8c7sm641983266b.9.2026.08.03.20.20.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Aug 2026 20:20:51 -0700 (PDT) Date: Mon, 3 Aug 2026 23:20:48 -0400 From: "Michael S. Tsirkin" To: Jia Jia Cc: stefanha@redhat.com, kvm@vger.kernel.org, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 2/2] vhost/vsock: keep IOTLB across feature updates Message-ID: <20260803232008-mutt-send-email-mst@kernel.org> References: <20260730104857-mutt-send-email-mst@kernel.org> <20260731103414.1746316-1-physicalmtea@gmail.com> <20260731103414.1746316-3-physicalmtea@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260731103414.1746316-3-physicalmtea@gmail.com> On Fri, Jul 31, 2026 at 06:34:14PM +0800, Jia Jia wrote: > VHOST_SET_FEATURES is also used to update logging while a device is > running. When ACCESS_PLATFORM stays enabled, allocating a new empty > IOTLB on every call drops valid translations and forces avoidable > misses. > > Initialize the device IOTLB only when one does not already exist. > > Signed-off-by: Jia Jia You did not CCc all maintainers and lists with this patchset. ./scripts/get_maintainer.pl -f drivers/vhost/vsock.c will help find out whom to copy. thanks! > --- > drivers/vhost/vsock.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c > index 562b9e139a76..3703fd219039 100644 > --- a/drivers/vhost/vsock.c > +++ b/drivers/vhost/vsock.c > @@ -893,7 +893,8 @@ static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features) > goto err; > } > > - if ((features & (1ULL << VIRTIO_F_ACCESS_PLATFORM))) { > + if ((features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)) && > + !vsock->dev.iotlb) { > if (vhost_init_device_iotlb(&vsock->dev)) > goto err; > } > -- > 2.34.1