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Fri, 18 Jun 2021 16:06:55 +0000 Received: from userp3020.oracle.com (userp3020.oracle.com [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 15IG6sV1167639; Fri, 18 Jun 2021 16:06:54 GMT Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by userp3020.oracle.com with ESMTP id 396wayyuxh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 18 Jun 2021 16:06:54 +0000 Received: from abhmp0001.oracle.com (abhmp0001.oracle.com [141.146.116.7]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 15IG6pih018495; Fri, 18 Jun 2021 16:06:51 GMT Received: from lateralus.us.oracle.com (/10.149.232.101) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 18 Jun 2021 16:06:51 +0000 From: Ross Philipson To: linux-kernel@vger.kernel.org, x86@kernel.org, iommu@lists.linux-foundation.org, linux-integrity@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v2 08/12] kexec: Secure Launch kexec SEXIT support Date: Fri, 18 Jun 2021 12:12:53 -0400 Message-Id: <1624032777-7013-9-git-send-email-ross.philipson@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1624032777-7013-1-git-send-email-ross.philipson@oracle.com> References: <1624032777-7013-1-git-send-email-ross.philipson@oracle.com> X-Proofpoint-GUID: 0Viov2hHSfNgLDHDilXu2cMCH8No2Jc- X-Proofpoint-ORIG-GUID: 0Viov2hHSfNgLDHDilXu2cMCH8No2Jc- Cc: dpsmith@apertussolutions.com, ross.philipson@oracle.com, luto@amacapital.net, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, tglx@linutronix.de, trenchboot-devel@googlegroups.com X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" Prior to running the next kernel via kexec, the Secure Launch code closes down private SMX resources and does an SEXIT. This allows the next kernel to start normally without any issues starting the APs etc. Signed-off-by: Ross Philipson --- arch/x86/kernel/slaunch.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++ kernel/kexec_core.c | 4 +++ 2 files changed, 75 insertions(+) diff --git a/arch/x86/kernel/slaunch.c b/arch/x86/kernel/slaunch.c index a24d384..8db557a 100644 --- a/arch/x86/kernel/slaunch.c +++ b/arch/x86/kernel/slaunch.c @@ -470,3 +470,74 @@ void __init slaunch_setup(void) vendor[3] == INTEL_CPUID_MFGID_EDX) slaunch_setup_intel(); } + +static inline void smx_getsec_sexit(void) +{ + asm volatile (".byte 0x0f,0x37\n" + : : "a" (SMX_X86_GETSEC_SEXIT)); +} + +void slaunch_finalize(int do_sexit) +{ + void __iomem *config; + u64 one = TXT_REGVALUE_ONE, val; + + if ((slaunch_get_flags() & (SL_FLAG_ACTIVE|SL_FLAG_ARCH_TXT)) != + (SL_FLAG_ACTIVE|SL_FLAG_ARCH_TXT)) + return; + + config = ioremap(TXT_PRIV_CONFIG_REGS_BASE, TXT_NR_CONFIG_PAGES * + PAGE_SIZE); + if (!config) { + pr_emerg("Error SEXIT failed to ioremap TXT private reqs\n"); + return; + } + + /* Clear secrets bit for SEXIT */ + memcpy_toio(config + TXT_CR_CMD_NO_SECRETS, &one, sizeof(one)); + memcpy_fromio(&val, config + TXT_CR_E2STS, sizeof(val)); + + /* Unlock memory configurations */ + memcpy_toio(config + TXT_CR_CMD_UNLOCK_MEM_CONFIG, &one, sizeof(one)); + memcpy_fromio(&val, config + TXT_CR_E2STS, sizeof(val)); + + /* Close the TXT private register space */ + memcpy_toio(config + TXT_CR_CMD_CLOSE_PRIVATE, &one, sizeof(one)); + memcpy_fromio(&val, config + TXT_CR_E2STS, sizeof(val)); + + /* + * Calls to iounmap are not being done because of the state of the + * system this late in the kexec process. Local IRQs are disabled and + * iounmap causes a TLB flush which in turn causes a warning. Leaving + * thse mappings is not an issue since the next kernel is going to + * completely re-setup memory management. + */ + + /* Map public registers and do a final read fence */ + config = ioremap(TXT_PUB_CONFIG_REGS_BASE, TXT_NR_CONFIG_PAGES * + PAGE_SIZE); + if (!config) { + pr_emerg("Error SEXIT failed to ioremap TXT public reqs\n"); + return; + } + + memcpy_fromio(&val, config + TXT_CR_E2STS, sizeof(val)); + + pr_emerg("TXT clear secrets bit and unlock memory complete."); + + if (!do_sexit) + return; + + if (smp_processor_id() != 0) { + pr_emerg("Error TXT SEXIT must be called on CPU 0\n"); + return; + } + + /* Disable SMX mode */ + cr4_set_bits(X86_CR4_SMXE); + + /* Do the SEXIT SMX operation */ + smx_getsec_sexit(); + + pr_emerg("TXT SEXIT complete."); +} diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index f099bae..1dcf20c 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include @@ -1178,6 +1179,9 @@ int kernel_kexec(void) cpu_hotplug_enable(); pr_notice("Starting new kernel\n"); machine_shutdown(); + + /* Finalize TXT registers and do SEXIT */ + slaunch_finalize(1); } kmsg_dump(KMSG_DUMP_SHUTDOWN); -- 1.8.3.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu