From nobody Fri Dec 19 17:42:01 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass header.i=@intel.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=intel.com ARC-Seal: i=1; a=rsa-sha256; t=1709188784; cv=none; d=zohomail.com; s=zohoarc; b=Itn6bw5HUhsEi0d63VArVv4gA4pYi8uHiUX2CnIEaT9RjGEq4eqXuJ56pfkwdRuOjkxOeVJRVONKSWaSqWixX1NpGFASBGEbLE7FM+ep8MPEDN9JMWMGdmtTOCfo8XrY5QzyK68yE+OGeLeYrdYgp5SO6H4qc4h+1j9iBq0ISC0= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1709188784; h=Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=680CWxzGIflFfLiLXBAUQ/Qabz4pk8VCByuNnxLg8r8=; b=khyPwUVVHBn4Mj5YnC3GGrJBqRutsOnm5SiuCtyn8AxpfwuisDSpyVIyb85LCpsjcanIhp0BaF55KjsZdqRxJjvSfViFtV3WysMlg4ku58ZYsaKD8XHnSP2Kx3RL+m0cqDSajVA4kR4VTh2ktFNFd3leO58aI5tgd27PlNQHUEY= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=@intel.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1709188784581233.024779238448; Wed, 28 Feb 2024 22:39:44 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rfa3p-0000nF-BG; Thu, 29 Feb 2024 01:38:32 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rfa3j-0000kj-4P for qemu-devel@nongnu.org; Thu, 29 Feb 2024 01:38:23 -0500 Received: from mgamail.intel.com ([192.198.163.15]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rfa3h-0004LA-G3 for qemu-devel@nongnu.org; Thu, 29 Feb 2024 01:38:22 -0500 Received: from orviesa007.jf.intel.com ([10.64.159.147]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Feb 2024 22:38:20 -0800 Received: from lxy-clx-4s.sh.intel.com ([10.239.48.52]) by orviesa007.jf.intel.com with ESMTP; 28 Feb 2024 22:38:14 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1709188701; x=1740724701; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=WAqfZmQu9OAek4ji1m8qxL8+r+CAlNqVbFvsF8ajRvo=; b=WfpZylECUuOu26I0ee2FTURaX1krWZ7M8Csj0IMYeJpa5AnrmmP2wDjc VzpNLU5n1hljPrZhtJr+Scguxyr/j1AYvebZriC/I9l+kGGkyIDlt0wS5 AqutGANSz9AJTpy8wrIvTGYWfMPG8t3PQKv7zUoSFtMeWOrZa/q3LgEf/ p4VB6iO396rhKfm2mzJAUMEG0QcrqNWf9Qgv1bTaIgyof7x/N34R8BqQA eaG6ZN6JlMzVKquvkPdRmArbSTT5wpozY8epEla4r+GVUr+g4lUuDsO0x eS6VIwhMvdm3Y/Z8zUIetKHHrVe5FDdGMjruJKgWzn49jhqS9/65czNTR g==; X-IronPort-AV: E=McAfee;i="6600,9927,10998"; a="3802517" X-IronPort-AV: E=Sophos;i="6.06,192,1705392000"; d="scan'208";a="3802517" X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.06,192,1705392000"; d="scan'208";a="8074898" From: Xiaoyao Li To: Paolo Bonzini , David Hildenbrand , Igor Mammedov , Eduardo Habkost , Marcel Apfelbaum , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Yanan Wang , "Michael S. Tsirkin" , Richard Henderson , Ani Sinha , Peter Xu , Cornelia Huck , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Eric Blake , Markus Armbruster , Marcelo Tosatti Cc: kvm@vger.kernel.org, qemu-devel@nongnu.org, Michael Roth , Claudio Fontana , Gerd Hoffmann , Isaku Yamahata , Chenyi Qiang , xiaoyao.li@intel.com Subject: [PATCH v5 07/65] physmem: Introduce ram_block_discard_guest_memfd_range() Date: Thu, 29 Feb 2024 01:36:28 -0500 Message-Id: <20240229063726.610065-8-xiaoyao.li@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240229063726.610065-1-xiaoyao.li@intel.com> References: <20240229063726.610065-1-xiaoyao.li@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=192.198.163.15; envelope-from=xiaoyao.li@intel.com; helo=mgamail.intel.com X-Spam_score_int: -5 X-Spam_score: -0.6 X-Spam_bar: / X-Spam_report: (-0.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.102, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, HK_RANDOM_ENVFROM=0.596, HK_RANDOM_FROM=0.999, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @intel.com) X-ZM-MESSAGEID: 1709188784874100001 Content-Type: text/plain; charset="utf-8" When memory page is converted from private to shared, the original private memory is back'ed by guest_memfd. Introduce ram_block_discard_guest_memfd_range() for discarding memory in guest_memfd. Originally-from: Isaku Yamahata Codeveloped-by: Xiaoyao Li Signed-off-by: Xiaoyao Li Reviewed-by: David Hildenbrand --- Changes in v5: - Collect Reviewed-by from David; Changes in in v4: - Drop ram_block_convert_range() and open code its implementation in the next Patch. --- include/exec/cpu-common.h | 2 ++ system/physmem.c | 23 +++++++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h index 9ead1be10057..ccd46ad3e173 100644 --- a/include/exec/cpu-common.h +++ b/include/exec/cpu-common.h @@ -166,6 +166,8 @@ typedef int (RAMBlockIterFunc)(RAMBlock *rb, void *opaq= ue); =20 int qemu_ram_foreach_block(RAMBlockIterFunc func, void *opaque); int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length); +int ram_block_discard_guest_memfd_range(RAMBlock *rb, uint64_t start, + size_t length); =20 #endif =20 diff --git a/system/physmem.c b/system/physmem.c index c4fc1e506de8..8c9368bc99ef 100644 --- a/system/physmem.c +++ b/system/physmem.c @@ -3618,6 +3618,29 @@ err: return ret; } =20 +int ram_block_discard_guest_memfd_range(RAMBlock *rb, uint64_t start, + size_t length) +{ + int ret =3D -1; + +#ifdef CONFIG_FALLOCATE_PUNCH_HOLE + ret =3D fallocate(rb->guest_memfd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KE= EP_SIZE, + start, length); + + if (ret) { + ret =3D -errno; + error_report("%s: Failed to fallocate %s:%" PRIx64 " +%zx (%d)", + __func__, rb->idstr, start, length, ret); + } +#else + ret =3D -ENOSYS; + error_report("%s: fallocate not available %s:%" PRIx64 " +%zx (%d)", + __func__, rb->idstr, start, length, ret); +#endif + + return ret; +} + bool ramblock_is_pmem(RAMBlock *rb) { return rb->flags & RAM_PMEM; --=20 2.34.1