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Fri, 28 Mar 2025 23:13:32 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 45jj701k81-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Fri, 28 Mar 2025 23:13:32 +0000 Received: from phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 52SNDV5w027033; Fri, 28 Mar 2025 23:13:31 GMT Received: from bur-virt-x6-2-100.us.oracle.com (bur-virt-x6-2-100.us.oracle.com [10.153.92.40]) by phxpaimrmta03.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 45jj701k77-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Fri, 28 Mar 2025 23:13:31 +0000 From: Ross Philipson To: linux-kernel@vger.kernel.org, x86@kernel.org, linux-integrity@vger.kernel.org, linux-doc@vger.kernel.org, linux-crypto@vger.kernel.org, kexec@lists.infradead.org, linux-efi@vger.kernel.org, iommu@lists.linux.dev Cc: ross.philipson@oracle.com, dpsmith@apertussolutions.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, dave.hansen@linux.intel.com, ardb@kernel.org, mjg59@srcf.ucam.org, James.Bottomley@hansenpartnership.com, peterhuewe@gmx.de, jarkko@kernel.org, jgg@ziepe.ca, luto@amacapital.net, nivedita@alum.mit.edu, herbert@gondor.apana.org.au, davem@davemloft.net, corbet@lwn.net, ebiederm@xmission.com, dwmw2@infradead.org, baolu.lu@linux.intel.com, kanth.ghatraju@oracle.com, andrew.cooper3@citrix.com, trenchboot-devel@googlegroups.com Subject: [PATCH v13 13/19] x86/reboot: Secure Launch SEXIT support on reboot paths Date: Fri, 28 Mar 2025 16:08:08 -0700 Message-Id: <20250328230814.2210230-14-ross.philipson@oracle.com> X-Mailer: git-send-email 2.39.3 In-Reply-To: <20250328230814.2210230-1-ross.philipson@oracle.com> References: <20250328230814.2210230-1-ross.philipson@oracle.com> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-28_11,2025-03-27_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 mlxlogscore=999 adultscore=0 phishscore=0 suspectscore=0 malwarescore=0 spamscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2502280000 definitions=main-2503280156 X-Proofpoint-GUID: IvCBu-NqQRPMYCp3b7pQaaNbQMGzZ1Cy X-Proofpoint-ORIG-GUID: IvCBu-NqQRPMYCp3b7pQaaNbQMGzZ1Cy If the MLE kernel is being powered off, rebooted or halted, then SEXIT must be called. Note that the SEXIT GETSEC leaf can only be called after a machine_shutdown() has been done on these paths. The machine_shutdown() is not called on a few paths like when poweroff action does not have a poweroff callback (into ACPI code) or when an emergency reset is done. In these cases, just the TXT registers are finalized but SEXIT is skipped. Signed-off-by: Ross Philipson --- arch/x86/kernel/reboot.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c index 964f6b0a3d68..9069415e0788 100644 --- a/arch/x86/kernel/reboot.c +++ b/arch/x86/kernel/reboot.c @@ -13,6 +13,7 @@ #include #include #include +#include #include #include #include @@ -778,6 +779,7 @@ static void native_machine_restart(char *__unused) if (!reboot_force) machine_shutdown(); + slaunch_finalize(!reboot_force); __machine_emergency_restart(0); } @@ -788,6 +790,9 @@ static void native_machine_halt(void) tboot_shutdown(TB_SHUTDOWN_HALT); + /* SEXIT done after machine_shutdown() to meet TXT requirements */ + slaunch_finalize(1); + stop_this_cpu(NULL); } @@ -796,8 +801,12 @@ static void native_machine_power_off(void) if (kernel_can_power_off()) { if (!reboot_force) machine_shutdown(); + slaunch_finalize(!reboot_force); do_kernel_power_off(); + } else { + slaunch_finalize(0); } + /* A fallback in case there is no PM info available */ tboot_shutdown(TB_SHUTDOWN_HALT); } @@ -825,6 +834,7 @@ void machine_shutdown(void) void machine_emergency_restart(void) { + slaunch_finalize(0); __machine_emergency_restart(1); }