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[209.51.188.17]) by mx.google.com with ESMTPS id h8si8149170qvb.117.2020.03.23.07.59.50 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 23 Mar 2020 07:59:51 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@redhat.com header.s=mimecast20190719 header.b=OXXZG13I; spf=pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from localhost ([::1]:35042 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jGOYQ-0007x8-Gl for alex.bennee@linaro.org; Mon, 23 Mar 2020 10:59:50 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:46157) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jGOYH-0007wT-Bj for qemu-arm@nongnu.org; Mon, 23 Mar 2020 10:59:42 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jGOYF-0006KV-E1 for qemu-arm@nongnu.org; Mon, 23 Mar 2020 10:59:40 -0400 Received: from us-smtp-delivery-74.mimecast.com ([216.205.24.74]:30817) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jGOYF-0006K0-4A for qemu-arm@nongnu.org; Mon, 23 Mar 2020 10:59:39 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1584975578; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=u7nyB+lWQprElDIOs52J7ylHk6LCg+31QVwb10AMke8=; b=OXXZG13I+Wlf8VPi8tfBLRbBr0dTfEDl2S0UjtuqFTv6cnUNik82Lw6t73IWR/KUv/6r9d XAzEo1vOlNm/Y3duEkiw+dlbifuCrCb/R25c9kR7fK6IEdlPPPkDUCGk9590EQtBhKrNFB kBE/CVPfSVmnVnkL/AexqYOEFlwidFc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-101-gcDtLcoxP42q9KgFlcU8sQ-1; Mon, 23 Mar 2020 10:59:35 -0400 X-MC-Unique: gcDtLcoxP42q9KgFlcU8sQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5D2F08024CD; Mon, 23 Mar 2020 14:59:34 +0000 (UTC) Received: from localhost (unknown [10.40.208.31]) by smtp.corp.redhat.com (Postfix) with ESMTP id 386785DA85; Mon, 23 Mar 2020 14:59:18 +0000 (UTC) Date: Mon, 23 Mar 2020 15:59:17 +0100 From: Igor Mammedov To: Shameer Kolothum Subject: Re: [PATCH v3 04/10] hw/acpi/nvdimm: Fix for NVDIMM incorrect DSM output buffer length Message-ID: <20200323155917.60ce6c0f@redhat.com> In-Reply-To: <20200311172014.33052-5-shameerali.kolothum.thodi@huawei.com> References: <20200311172014.33052-1-shameerali.kolothum.thodi@huawei.com> <20200311172014.33052-5-shameerali.kolothum.thodi@huawei.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 216.205.24.74 X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org, xiaoguangrong.eric@gmail.com, shannon.zhaosl@gmail.com, david@redhat.com, qemu-devel@nongnu.org, xuwei5@hisilicon.com, linuxarm@huawei.com, eric.auger@redhat.com, qemu-arm@nongnu.org, mst@redhat.com, lersek@redhat.com Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: "Qemu-arm" X-TUID: dINKVcV6der9 On Wed, 11 Mar 2020 17:20:08 +0000 Shameer Kolothum wrote: > As per ACPI spec 6.3, Table 19-419 Object Conversion Rules, if > the Buffer Field <= to the size of an Integer (in bits), it will > be treated as an integer. Moreover, the integer size depends on > DSDT tables revision number. If revision number is < 2, integer > size is 32 bits, otherwise it is 64 bits. Current NVDIMM common > DSM aml code (NCAL) uses CreateField() for creating DSM output > buffer. This creates an issue in arm/virt platform where DSDT > revision number is 2 and results in DSM buffer with a wrong > size(8 bytes) gets returned when actual length is < 8 bytes. > This causes guest kernel to report, > > "nfit ACPI0012:00: found a zero length table '0' parsing nfit" > > In order to fix this, aml code is now modified such that it builds > the DSM output buffer in a byte by byte fashion when length is > smaller than Integer size. > > Suggested-by: Igor Mammedov > Signed-off-by: Shameer Kolothum Reviewed-by: Igor Mammedov > --- > v2 -> v3 > - Using Integer size as 8 bytes instead of SizeOf(Integer) > --- > hw/acpi/nvdimm.c | 40 +++++++++++++++++++-- > tests/qtest/bios-tables-test-allowed-diff.h | 2 ++ > 2 files changed, 39 insertions(+), 3 deletions(-) > > diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c > index 5219dd0e2e..213556f35d 100644 > --- a/hw/acpi/nvdimm.c > +++ b/hw/acpi/nvdimm.c > @@ -938,6 +938,7 @@ static void nvdimm_build_common_dsm(Aml *dev) > Aml *method, *ifctx, *function, *handle, *uuid, *dsm_mem, *elsectx2; > Aml *elsectx, *unsupport, *unpatched, *expected_uuid, *uuid_invalid; > Aml *pckg, *pckg_index, *pckg_buf, *field, *dsm_out_buf, *dsm_out_buf_size; > + Aml *whilectx, *offset; > uint8_t byte_list[1]; > > method = aml_method(NVDIMM_COMMON_DSM, 5, AML_SERIALIZED); > @@ -1091,13 +1092,46 @@ static void nvdimm_build_common_dsm(Aml *dev) > /* RLEN is not included in the payload returned to guest. */ > aml_append(method, aml_subtract(aml_name(NVDIMM_DSM_OUT_BUF_SIZE), > aml_int(4), dsm_out_buf_size)); > + > + /* > + * As per ACPI spec 6.3, Table 19-419 Object Conversion Rules, if > + * the Buffer Field <= to the size of an Integer (in bits), it will > + * be treated as an integer. Moreover, the integer size depends on > + * DSDT tables revision number. If revision number is < 2, integer > + * size is 32 bits, otherwise it is 64 bits. > + * Because of this CreateField() canot be used if RLEN < Integer Size. > + * > + * Also please note that APCI ASL operator SizeOf() doesn't support > + * Integer and there isn't any other way to figure out the Integer > + * size. Hence we assume 8 byte as Integer size and if RLEN < 8 bytes, > + * build dsm_out_buf byte by byte. > + */ > + ifctx = aml_if(aml_lless(dsm_out_buf_size, aml_int(8))); > + offset = aml_local(2); > + aml_append(ifctx, aml_store(aml_int(0), offset)); > + aml_append(ifctx, aml_name_decl("TBUF", aml_buffer(1, NULL))); > + aml_append(ifctx, aml_store(aml_buffer(0, NULL), dsm_out_buf)); > + > + whilectx = aml_while(aml_lless(offset, dsm_out_buf_size)); > + /* Copy 1 byte at offset from ODAT to temporary buffer(TBUF). */ > + aml_append(whilectx, aml_store(aml_derefof(aml_index( > + aml_name(NVDIMM_DSM_OUT_BUF), offset)), > + aml_index(aml_name("TBUF"), aml_int(0)))); > + aml_append(whilectx, aml_concatenate(dsm_out_buf, aml_name("TBUF"), > + dsm_out_buf)); > + aml_append(whilectx, aml_increment(offset)); > + aml_append(ifctx, whilectx); > + > + aml_append(ifctx, aml_return(dsm_out_buf)); > + aml_append(method, ifctx); > + > + /* If RLEN >= Integer size, just use CreateField() operator */ > aml_append(method, aml_store(aml_shiftleft(dsm_out_buf_size, aml_int(3)), > dsm_out_buf_size)); > aml_append(method, aml_create_field(aml_name(NVDIMM_DSM_OUT_BUF), > aml_int(0), dsm_out_buf_size, "OBUF")); > - aml_append(method, aml_concatenate(aml_buffer(0, NULL), aml_name("OBUF"), > - dsm_out_buf)); > - aml_append(method, aml_return(dsm_out_buf)); > + aml_append(method, aml_return(aml_name("OBUF"))); > + > aml_append(dev, method); > } > > diff --git a/tests/qtest/bios-tables-test-allowed-diff.h b/tests/qtest/bios-tables-test-allowed-diff.h > index dfb8523c8b..eb8bae1407 100644 > --- a/tests/qtest/bios-tables-test-allowed-diff.h > +++ b/tests/qtest/bios-tables-test-allowed-diff.h > @@ -1 +1,3 @@ > /* List of comma-separated changed AML files to ignore */ > +"tests/data/acpi/pc/SSDT.dimmpxm", > +"tests/data/acpi/q35/SSDT.dimmpxm",