From patchwork Thu Sep 19 12:40:45 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cornelia Huck X-Patchwork-Id: 11152411 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 CE6E513BD for ; Thu, 19 Sep 2019 13:36:31 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 AFFF921D56 for ; Thu, 19 Sep 2019 13:36:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AFFF921D56 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:44114 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iAwbm-0006Vh-Bo for patchwork-qemu-devel@patchwork.kernel.org; Thu, 19 Sep 2019 09:36:30 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:41479) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iAvsh-0006Le-64 for qemu-devel@nongnu.org; Thu, 19 Sep 2019 08:50:00 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iAvke-0007zX-3X for qemu-devel@nongnu.org; Thu, 19 Sep 2019 08:41:37 -0400 Received: from mx1.redhat.com ([209.132.183.28]:33286) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iAvkd-0007wJ-SJ; Thu, 19 Sep 2019 08:41:36 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 328CE30B2502; Thu, 19 Sep 2019 12:41:35 +0000 (UTC) Received: from localhost (dhcp-192-230.str.redhat.com [10.33.192.230]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 8321460BF1; Thu, 19 Sep 2019 12:41:31 +0000 (UTC) From: Cornelia Huck To: Peter Maydell Date: Thu, 19 Sep 2019 14:40:45 +0200 Message-Id: <20190919124115.11510-5-cohuck@redhat.com> In-Reply-To: <20190919124115.11510-1-cohuck@redhat.com> References: <20190919124115.11510-1-cohuck@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Thu, 19 Sep 2019 12:41:35 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 04/34] s390x/tcg: MVCL: Process max 4k bytes at a time X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-s390x@nongnu.org, Richard Henderson , qemu-devel@nongnu.org, David Hildenbrand Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: David Hildenbrand Process max 4k bytes at a time, writing back registers between the accesses. The instruction is interruptible. "For operands longer than 2K bytes, access exceptions are not recognized for locations more than 2K bytes beyond the current location being processed." Note that on z/Architecture, 2k vs. 4k access cannot get differentiated as long as pages are not crossed. This seems to be a leftover from ESA/390. Simply stay within single pages. MVCL handling is quite different than MVCLE/MVCLU handling, so split up the handlers. Defer interrupt handling, as that will require more thought, add a TODO for that. Reviewed-by: Richard Henderson Signed-off-by: David Hildenbrand --- target/s390x/mem_helper.c | 44 +++++++++++++++++++++++++++++++++------ 1 file changed, 38 insertions(+), 6 deletions(-) diff --git a/target/s390x/mem_helper.c b/target/s390x/mem_helper.c index 223312a4b194..58ab2e48e341 100644 --- a/target/s390x/mem_helper.c +++ b/target/s390x/mem_helper.c @@ -798,19 +798,51 @@ uint32_t HELPER(mvcl)(CPUS390XState *env, uint32_t r1, uint32_t r2) uint64_t srclen = env->regs[r2 + 1] & 0xffffff; uint64_t src = get_address(env, r2); uint8_t pad = env->regs[r2 + 1] >> 24; - uint32_t cc; + uint32_t cc, cur_len; if (is_destructive_overlap(env, dest, src, MIN(srclen, destlen))) { cc = 3; + } else if (srclen == destlen) { + cc = 0; + } else if (destlen < srclen) { + cc = 1; } else { - cc = do_mvcl(env, &dest, &destlen, &src, &srclen, pad, 1, ra); + cc = 2; } - env->regs[r1 + 1] = deposit64(env->regs[r1 + 1], 0, 24, destlen); - env->regs[r2 + 1] = deposit64(env->regs[r2 + 1], 0, 24, srclen); - set_address_zero(env, r1, dest); - set_address_zero(env, r2, src); + /* We might have to zero-out some bits even if there was no action. */ + if (unlikely(!destlen || cc == 3)) { + set_address_zero(env, r2, src); + set_address_zero(env, r1, dest); + return cc; + } else if (!srclen) { + set_address_zero(env, r2, src); + } + /* + * Only perform one type of type of operation (move/pad) in one step. + * Stay within single pages. + */ + while (destlen) { + cur_len = MIN(destlen, -(dest | TARGET_PAGE_MASK)); + if (!srclen) { + fast_memset(env, dest, pad, cur_len, ra); + } else { + cur_len = MIN(MIN(srclen, -(src | TARGET_PAGE_MASK)), cur_len); + + fast_memmove(env, dest, src, cur_len, ra); + src = wrap_address(env, src + cur_len); + srclen -= cur_len; + env->regs[r2 + 1] = deposit64(env->regs[r2 + 1], 0, 24, srclen); + set_address_zero(env, r2, src); + } + dest = wrap_address(env, dest + cur_len); + destlen -= cur_len; + env->regs[r1 + 1] = deposit64(env->regs[r1 + 1], 0, 24, destlen); + set_address_zero(env, r1, dest); + + /* TODO: Deliver interrupts. */ + } return cc; }