From patchwork Mon Jul 27 09:13:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Roger Pau Monne X-Patchwork-Id: 11686637 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4017C138A for ; Mon, 27 Jul 2020 09:15:38 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 1A34120656 for ; Mon, 27 Jul 2020 09:15:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=citrix.com header.i=@citrix.com header.b="KZInzin2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1A34120656 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=citrix.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1jzzE8-0004TU-TT; Mon, 27 Jul 2020 09:15:20 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1jzzE7-0004OD-HT for xen-devel@lists.xenproject.org; Mon, 27 Jul 2020 09:15:19 +0000 X-Inumbo-ID: ab0a4cda-cfe9-11ea-8a7e-bc764e2007e4 Received: from esa3.hc3370-68.iphmx.com (unknown [216.71.145.155]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id ab0a4cda-cfe9-11ea-8a7e-bc764e2007e4; Mon, 27 Jul 2020 09:15:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=citrix.com; s=securemail; t=1595841309; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Nq9yI9ZapjAU3I2ISQYBx01cREm8iD5IrXb3HWdctu0=; b=KZInzin2gcDJQRvZdUwizW0PAokuwA9G1EfiBgPiA+O49KeLaeSfkJMr f1GNSEvLtMTwrrUrVsUcnLOhOR1fZr6H5SwkForVztBAWQcQ/rljyQO/d Ao6+E4cvtv4YW6j2Xns7IBOVSd5u4r3hr5DvPx21Z+N4q7tfFY29NztrC Y=; Authentication-Results: esa3.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none IronPort-SDR: CaWT5LIbKdSm6bglJh6wY7Rm9pQCl8a6jhy9q8a+NizdhgIBcUgMJIVzAoXIXdLIYwEyNXjysu jSQTvNe1bbYVQi7e3KcyTmEZFi3CsDbUMupe+asAciCVSRx7faRfhMETYPniYTT+tB4f4E/ny3 8Z9NHVXMK/B/ZfpG36jfHVTra6T4EWIxWxLV5SwAHLLEW5I157sJPAJSregsF8/dAdp6FxmzH3 k9ZqiAppaKjGEJvBHAgFr+VIUtwQG6LUpdZxvOwrLfYO2QKjsRrmZ1Z54Lp0a4thonvBtWrRo4 ohI= X-SBRS: 2.7 X-MesageID: 23233916 X-Ironport-Server: esa3.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.75,402,1589256000"; d="scan'208";a="23233916" From: Roger Pau Monne To: Subject: [PATCH v3 3/4] Revert "xen/balloon: Fix crash when ballooning on x86 32 bit PAE" Date: Mon, 27 Jul 2020 11:13:41 +0200 Message-ID: <20200727091342.52325-4-roger.pau@citrix.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200727091342.52325-1-roger.pau@citrix.com> References: <20200727091342.52325-1-roger.pau@citrix.com> MIME-Version: 1.0 X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Juergen Gross , xen-devel@lists.xenproject.org, Boris Ostrovsky , Stefano Stabellini , Roger Pau Monne Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" This reverts commit dfd74a1edfaba5864276a2859190a8d242d18952. This has been fixed by commit dca4436d1cf9e0d237c which added the out of bounds check to __add_memory, so that trying to add blocks past MAX_PHYSMEM_BITS will fail. Note the check in the Xen balloon driver was bogus anyway, as it checked the start address of the resource, but it should instead test the end address to assert the whole resource falls below MAX_PHYSMEM_BITS. Signed-off-by: Roger Pau Monné Reviewed-by: Juergen Gross --- Cc: Boris Ostrovsky Cc: Juergen Gross Cc: Stefano Stabellini Cc: xen-devel@lists.xenproject.org --- drivers/xen/balloon.c | 14 -------------- 1 file changed, 14 deletions(-) diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index 292413b27575..b1d8b028bf80 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -266,20 +266,6 @@ static struct resource *additional_memory_resource(phys_addr_t size) return NULL; } -#ifdef CONFIG_SPARSEMEM - { - unsigned long limit = 1UL << (MAX_PHYSMEM_BITS - PAGE_SHIFT); - unsigned long pfn = res->start >> PAGE_SHIFT; - - if (pfn > limit) { - pr_err("New System RAM resource outside addressable RAM (%lu > %lu)\n", - pfn, limit); - release_memory_resource(res); - return NULL; - } - } -#endif - return res; }