From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from szxga01-in.huawei.com (szxga01-in.huawei.com [45.249.212.187]) (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 42E3113D608 for ; Thu, 13 Jun 2024 09:38:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.187 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718271524; cv=none; b=t+nqnRMg3bUZ9ggkdUWT+tA71IkZ9Wt1N1hqOvF25ckv+8imwi+RlB0adK/JsnIQJDJp3j8vamUa0x1yvlgf0xqIGTtWs9WbemVqzI52DoKHed8I1PqxPT/S29OiebaaeqgGnoAKsWcrkC80JFHS7wyydc1MZ7hBHoHF8reZ9Os= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718271524; c=relaxed/simple; bh=8M7rrCgkHxYdpgHkP4hx2BYeaaFXqvYRM0G1TYekg8E=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=sLjff7AY2ktO3GxX3E8Fmu2S+lIs9DKSlL7WQ8QSR7alJvRxIFFZwtewQhAIFo4EMXRnM1P8uC/3goA6WxdYz+23tLkVnuHb2YaDeGHQ76ChIMSJCkOoMb2E5bkGdYOg/lVkADdobM4FWjqQx3IzLKaT2210sAMUj+Eb5dKgpVo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.187 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.88.105]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4W0HLC1JZzzxT3C; Thu, 13 Jun 2024 17:34:27 +0800 (CST) Received: from kwepemm600007.china.huawei.com (unknown [7.193.23.208]) by mail.maildlp.com (Postfix) with ESMTPS id A1D72140447; Thu, 13 Jun 2024 17:38:32 +0800 (CST) Received: from DESKTOP-6NKE0BC.china.huawei.com (10.174.185.210) by kwepemm600007.china.huawei.com (7.193.23.208) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Thu, 13 Jun 2024 17:38:31 +0800 From: Kunkun Jiang To: Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Randy Dunlap CC: , , , Kunkun Jiang , Subject: [PATCH] KVM: arm64: vgic-its: clear dte when mapd unmaps a device Date: Thu, 13 Jun 2024 17:38:11 +0800 Message-ID: <20240613093811.710-1-jiangkunkun@huawei.com> X-Mailer: git-send-email 2.26.2.windows.1 Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To kwepemm600007.china.huawei.com (7.193.23.208) vgic_its_save_device_tables will traverse its->device_list to save dte for each device. vgic_its_restore_device_tables will traverse each entry of device table and check if it is valid. Restore if valid. But when mapd unmaps a devices, we do not invalidate the corresponding dte. In the scenario of continuous save and restore, there may be a situation where a device's dte is not saved but is restored. This is unreasonable and may cause restore to fail. This patch clears the corresponding dte when mapd unmaps a device. Singed-off-by: Shusen Li Signed-off-by: Kunkun Jiang --- arch/arm64/kvm/vgic/vgic-its.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c index 40bb43f20bf3..dd5fba1e8ba3 100644 --- a/arch/arm64/kvm/vgic/vgic-its.c +++ b/arch/arm64/kvm/vgic/vgic-its.c @@ -1140,8 +1140,12 @@ static int vgic_its_cmd_handle_mapd(struct kvm *kvm, struct vgic_its *its, u8 num_eventid_bits = its_cmd_get_size(its_cmd); gpa_t itt_addr = its_cmd_get_ittaddr(its_cmd); struct its_device *device; + gpa_t gpa; + const struct vgic_its_abi *abi; + int dte_esz; + u64 val; - if (!vgic_its_check_id(its, its->baser_device_table, device_id, NULL)) + if (!vgic_its_check_id(its, its->baser_device_table, device_id, &gpa)) return E_ITS_MAPD_DEVICE_OOR; if (valid && num_eventid_bits > VITS_TYPER_IDBITS) @@ -1161,8 +1165,13 @@ static int vgic_its_cmd_handle_mapd(struct kvm *kvm, struct vgic_its *its, * The spec does not say whether unmapping a not-mapped device * is an error, so we are done in any case. */ - if (!valid) + if (!valid) { + abi = vgic_its_get_abi(its); + dte_esz = abi->dte_esz; + val = cpu_to_le64(0); + vgic_write_guest_lock(kvm, gpa, &val, dte_esz); return 0; + } device = vgic_its_alloc_device(its, device_id, itt_addr, num_eventid_bits); -- 2.33.0