From nobody Mon Feb 9 12:10:00 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of groups.io designates 66.175.222.108 as permitted sender) client-ip=66.175.222.108; envelope-from=bounce+27952+72365+1787277+3901457@groups.io; helo=mail02.groups.io; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce+27952+72365+1787277+3901457@groups.io; dmarc=fail(p=none dis=none) header.from=linux.ibm.com ARC-Seal: i=1; a=rsa-sha256; t=1614718197; cv=none; d=zohomail.com; s=zohoarc; b=YqLoFWk8SaTermsNab2aqImq2WRQeyFwXecYyO8T0jjjaHUzwS3DLUuQs10/PREfemz90PCviq5qyEVoVT5RUaR5Px14PoP6FqKFoFeK0hqNLTOD9khfii6LGeD6r7ZMVRyimqEWUSCHwm5X1sLvt0UXOh9ZYfm9mg5DLq6pukM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1614718197; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Id:List-Unsubscribe:MIME-Version:Message-ID:Reply-To:References:Sender:Subject:To; bh=jwTHAi22yj5nLXjZ01QMRnI7aZW+vbxUTtG8yka6fkU=; b=bXCRF9lhq+GSQ4kkIdP6IkZUJ2gLTvhWo016aDWq3Q2Gfbk87+F0/PMqM1k71vKmE8pvlrHnN8Blqdnszu+RaIF2RebhjL3NmDqChEAKRYDLeIMea7OsovblyELhTGuGE+nxR3k2+3Afs0Tvy0bnr40sJkKZfpUZ5qyIC3lFajc= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of groups.io designates 66.175.222.108 as permitted sender) smtp.mailfrom=bounce+27952+72365+1787277+3901457@groups.io; dmarc=fail header.from= (p=none dis=none) header.from= Received: from mail02.groups.io (mail02.groups.io [66.175.222.108]) by mx.zohomail.com with SMTPS id 1614718197922688.7518253515582; Tue, 2 Mar 2021 12:49:57 -0800 (PST) Return-Path: X-Received: by 127.0.0.2 with SMTP id DPrgYY1788612xBxcaJpNdGN; Tue, 02 Mar 2021 12:49:57 -0800 X-Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by mx.groups.io with SMTP id smtpd.web08.482.1614718196826762954 for ; Tue, 02 Mar 2021 12:49:57 -0800 X-Received: from pps.filterd (m0098421.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.43/8.16.0.43) with SMTP id 122KhJHk124690; Tue, 2 Mar 2021 15:49:54 -0500 X-Received: from ppma03dal.us.ibm.com (b.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.11]) by mx0a-001b2d01.pphosted.com with ESMTP id 371vn7r8un-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 02 Mar 2021 15:49:54 -0500 X-Received: from pps.filterd (ppma03dal.us.ibm.com [127.0.0.1]) by ppma03dal.us.ibm.com (8.16.0.42/8.16.0.42) with SMTP id 122Km8v4014171; Tue, 2 Mar 2021 20:48:53 GMT X-Received: from b03cxnp07027.gho.boulder.ibm.com (b03cxnp07027.gho.boulder.ibm.com [9.17.130.14]) by ppma03dal.us.ibm.com with ESMTP id 37103w5sk0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 02 Mar 2021 20:48:53 +0000 X-Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp07027.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 122KmpY917563910 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 2 Mar 2021 20:48:51 GMT X-Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 109FCC605B; Tue, 2 Mar 2021 20:48:51 +0000 (GMT) X-Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7C15BC6055; Tue, 2 Mar 2021 20:48:50 +0000 (GMT) X-Received: from amdrome1.watson.ibm.com (unknown [9.2.130.16]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Tue, 2 Mar 2021 20:48:50 +0000 (GMT) From: "Tobin Feldman-Fitzthum" To: devel@edk2.groups.io Cc: Dov Murik , Tobin Feldman-Fitzthum , Tobin Feldman-Fitzthum , James Bottomley , Hubertus Franke , Brijesh Singh , Ashish Kalra , Jon Grimm , Tom Lendacky Subject: [edk2-devel] [RFC PATCH 07/14] OvmfPkg/AmdSev: MH support for mailbox protocol Date: Tue, 2 Mar 2021 15:48:32 -0500 Message-Id: <20210302204839.82042-8-tobin@linux.ibm.com> In-Reply-To: <20210302204839.82042-1-tobin@linux.ibm.com> References: <20210302204839.82042-1-tobin@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 Precedence: Bulk List-Unsubscribe: Sender: devel@edk2.groups.io List-Id: Mailing-List: list devel@edk2.groups.io; contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,tobin@linux.ibm.com X-Gm-Message-State: 8celPlfKrlwkc8PK8mLiWc7Vx1787277AA= Content-Transfer-Encoding: quoted-printable DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=groups.io; q=dns/txt; s=20140610; t=1614718197; bh=C9IHICFcSiuXjlTmKifD/fB6GRsEqtFw+9wLRjiVASw=; h=Cc:Date:From:Reply-To:Subject:To; b=acB45wqz83LyEyQKYqA44DYy4ExZZNW26tzQYbGG+rGopsa4hsIR1gngwpfJmafLFpY msHMJSna4DhpOSvOzD6Xw4uIpoEPOWPmyMCvBnFimE0drktowj/IvFyalK/OtbKYxBUHe apaqjGFSITSlp445LAX6ZlryTOsbeUAR/Bc= X-ZohoMail-DKIM: pass (identity @groups.io) Content-Type: text/plain; charset="utf-8" The migration handler communicates with the hypervisor via a shared mailbox page. The MH can perform four functions at the behest of the HV: init, save page, restore page, and reset. Signed-off-by: Tobin Feldman-Fitzthum --- .../ConfidentialMigrationDxe.inf | 1 + .../ConfidentialMigrationDxe.c | 78 +++++++++++++++++++ 2 files changed, 79 insertions(+) diff --git a/OvmfPkg/AmdSev/ConfidentialMigration/ConfidentialMigrationDxe.= inf b/OvmfPkg/AmdSev/ConfidentialMigration/ConfidentialMigrationDxe.inf index a4906a2451..49457d5d17 100644 --- a/OvmfPkg/AmdSev/ConfidentialMigration/ConfidentialMigrationDxe.inf +++ b/OvmfPkg/AmdSev/ConfidentialMigration/ConfidentialMigrationDxe.inf @@ -34,6 +34,7 @@ [Pcd] gUefiOvmfPkgTokenSpaceGuid.PcdIsConfidentialMigrationTarget gUefiOvmfPkgTokenSpaceGuid.PcdStartConfidentialMigrationHandler + gUefiOvmfPkgTokenSpaceGuid.PcdConfidentialMigrationMailboxBase =20 [Depex] gEfiMpServiceProtocolGuid diff --git a/OvmfPkg/AmdSev/ConfidentialMigration/ConfidentialMigrationDxe.= c b/OvmfPkg/AmdSev/ConfidentialMigration/ConfidentialMigrationDxe.c index 6d9fe7043b..8402fcc4fa 100644 --- a/OvmfPkg/AmdSev/ConfidentialMigration/ConfidentialMigrationDxe.c +++ b/OvmfPkg/AmdSev/ConfidentialMigration/ConfidentialMigrationDxe.c @@ -9,16 +9,94 @@ #include #include #include +#include =20 +// +// Functions implemented by the migration handler +// +#define MH_FUNC_INIT 0 +#define MH_FUNC_SAVE_PAGE 1 +#define MH_FUNC_RESTORE_PAGE 2 +#define MH_FUNC_RESET 3 + +// +// Return codes for MH functions +// +#define MH_SUCCESS 0 +#define MH_INVALID_FUNC (-1) +#define MH_AUTH_ERR (-2) + +// +// Index of CPU that MH runs on. +// UINTN MigrationHandlerCpuIndex; =20 +// +// Mailbox for communication with hypervisor +// +typedef volatile struct { + UINT64 nr; + UINT64 gpa; + UINT32 do_prefetch; + UINT32 ret; + UINT32 go; + UINT32 done; +} MH_COMMAND_PARAMETERS; + + VOID EFIAPI MigrationHandlerMain ( IN OUT VOID *Buffer ) { + UINT64 params_base; + MH_COMMAND_PARAMETERS *params; + VOID *page_va; + DebugPrint (DEBUG_INFO,"MIGRATION Handler Started\n"); + + params_base =3D PcdGet32 (PcdConfidentialMigrationMailboxBase); + params =3D (VOID *)params_base; + page_va =3D (VOID *)params_base + 0x1000; + + DisableInterrupts(); + params->go =3D 0; + + while (1) { + while (!params->go) { + CpuPause(); + } + params->done =3D 0; + + switch (params->nr) { + case MH_FUNC_INIT: + params->ret =3D MH_SUCCESS; + break; + + case MH_FUNC_SAVE_PAGE: + CopyMem(page_va, (VOID *)params->gpa, 4096); + params->ret =3D MH_SUCCESS; + break; + + case MH_FUNC_RESTORE_PAGE: + CopyMem((VOID *)params->gpa, page_va, 4096); + params->ret =3D MH_SUCCESS; + break; + + case MH_FUNC_RESET: + params->ret =3D MH_SUCCESS; + break; + + default: + params->ret =3D MH_INVALID_FUNC; + break; + } + + params->go =3D 0; + params->done =3D 1; + + } } =20 EFI_STATUS --=20 2.20.1 -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. 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