From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D03D9C43217 for ; Tue, 5 Apr 2022 13:33:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1383495AbiDENap (ORCPT ); Tue, 5 Apr 2022 09:30:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44250 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345428AbiDEJWd (ORCPT ); Tue, 5 Apr 2022 05:22:33 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8CE124A91A; Tue, 5 Apr 2022 02:10:56 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C617661527; Tue, 5 Apr 2022 09:10:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D3642C385A0; Tue, 5 Apr 2022 09:10:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649149855; bh=8VTJKxnFGmJl+q+s6XaRFXc08iUt6ahkmVP/NwzLsz4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xqjil2mu7Wxd+r7uitqcaBGx7BS5gNWwy+XQ+oeS/1g6otGQTv0Ax9av9QVfxD11Z 4JDfuzcdsZtPb7cL4cokdPasUOi493gKwKBpS+x7xGo+8S+krKL/nSOOLsoNTWkuhM 8VsxG1A9eITg+lcYjfzvZvcNfEikhCAqbsuonM7U= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vitaly Kuznetsov , Paolo Bonzini Subject: [PATCH 5.16 0864/1017] KVM: x86: hyper-v: Fix the maximum number of sparse banks for XMM fast TLB flush hypercalls Date: Tue, 5 Apr 2022 09:29:37 +0200 Message-Id: <20220405070419.881405296@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070354.155796697@linuxfoundation.org> References: <20220405070354.155796697@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Vitaly Kuznetsov commit 7321f47eada53a395fb3086d49297eebb19e8e58 upstream. When TLB flush hypercalls (HVCALL_FLUSH_VIRTUAL_ADDRESS_{LIST,SPACE}_EX are issued in 'XMM fast' mode, the maximum number of allowed sparse_banks is not 'HV_HYPERCALL_MAX_XMM_REGISTERS - 1' (5) but twice as many (10) as each XMM register is 128 bit long and can hold two 64 bit long banks. Cc: stable@vger.kernel.org # 5.14.x Fixes: 5974565bc26d ("KVM: x86: kvm_hv_flush_tlb use inputs from XMM registers") Signed-off-by: Vitaly Kuznetsov Message-Id: <20220222154642.684285-4-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/hyperv.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -1819,7 +1819,8 @@ static u64 kvm_hv_flush_tlb(struct kvm_v if (!all_cpus) { if (hc->fast) { - if (sparse_banks_len > HV_HYPERCALL_MAX_XMM_REGISTERS - 1) + /* XMM0 is already consumed, each XMM holds two sparse banks. */ + if (sparse_banks_len > 2 * (HV_HYPERCALL_MAX_XMM_REGISTERS - 1)) return HV_STATUS_INVALID_HYPERCALL_INPUT; for (i = 0; i < sparse_banks_len; i += 2) { sparse_banks[i] = sse128_lo(hc->xmm[i / 2 + 1]);