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From: Sean Christopherson <sean.j.christopherson@intel.com>
To: "Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Ingo Molnar" <mingo@redhat.com>,
	"Borislav Petkov" <bp@alien8.de>,
	x86@kernel.org,
	"Jarkko Sakkinen" <jarkko.sakkinen@linux.intel.com>,
	"Sean Christopherson" <sean.j.christopherson@intel.com>,
	"Joerg Roedel" <joro@8bytes.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-sgx@vger.kernel.org, Andy Lutomirski <luto@amacapital.net>
Subject: [RFC PATCH 14/21] x86/sgx: Add helpers to expose ECREATE and EINIT to KVM
Date: Fri, 26 Jul 2019 22:52:07 -0700
Message-ID: <20190727055214.9282-15-sean.j.christopherson@intel.com> (raw)
In-Reply-To: <20190727055214.9282-1-sean.j.christopherson@intel.com>

Provide wrappers around __ecreate() and __einit() to export their
functionality for use by KVM without having to export a large amount of
SGX boilerplate code.  Intermediate helpers also shelter KVM from the
ugliness of overloading the ENCLS return value to encode multiple error
formats in a single int.

KVM will use the helpers to trap-and-execute ECREATE and EINIT as part
its SGX virtualization.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/Kconfig               |  3 ++
 arch/x86/include/asm/sgx.h     | 15 ++++++++++
 arch/x86/kernel/cpu/sgx/virt.c | 55 ++++++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+)
 create mode 100644 arch/x86/include/asm/sgx.h

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index c1bdb9f85928..8bbc6a30588d 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1969,6 +1969,9 @@ config INTEL_SGX_VIRTUALIZATION
 	  "raw" EPC for the purpose of exposing EPC to a KVM guest, i.e. a
 	  virtual machine, via a device node (/dev/sgx/virt_epc by default).
 
+	  SGX virtualization also adds helpers that are used by KVM to trap
+	  and execute certain ENCLS instructions on behalf of a KVM guest.
+
 	  If unsure, say N.
 
 config EFI
diff --git a/arch/x86/include/asm/sgx.h b/arch/x86/include/asm/sgx.h
new file mode 100644
index 000000000000..f0f0176b8e2f
--- /dev/null
+++ b/arch/x86/include/asm/sgx.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_SGX_H
+#define _ASM_X86_SGX_H
+
+#include <linux/types.h>
+
+struct sgx_pageinfo;
+
+#if IS_ENABLED(CONFIG_KVM_INTEL)
+int sgx_ecreate(struct sgx_pageinfo *pageinfo, void __user *secs, int *trapnr);
+int sgx_einit(void __user *sigstruct, void __user *token,
+	      void __user *secs, u64 *lepubkeyhash, int *trapnr);
+#endif
+
+#endif /* _ASM_X86_SGX_H */
diff --git a/arch/x86/kernel/cpu/sgx/virt.c b/arch/x86/kernel/cpu/sgx/virt.c
index 79ee5917a4fc..9e5bf4450bf7 100644
--- a/arch/x86/kernel/cpu/sgx/virt.c
+++ b/arch/x86/kernel/cpu/sgx/virt.c
@@ -251,3 +251,58 @@ int __init sgx_virt_epc_init(void)
 
 	return ret;
 }
+
+#if IS_ENABLED(CONFIG_KVM_INTEL)
+int sgx_ecreate(struct sgx_pageinfo *pageinfo, void __user *secs, int *trapnr)
+{
+	int ret;
+
+	__uaccess_begin();
+	ret = __ecreate(pageinfo, (void *)secs);
+	__uaccess_end();
+
+	if (encls_faulted(ret)) {
+		*trapnr = ENCLS_TRAPNR(ret);
+		return -EFAULT;
+	}
+	return ret;
+}
+EXPORT_SYMBOL_GPL(sgx_ecreate);
+
+static int __sgx_einit(void __user *sigstruct, void __user *token,
+		       void __user *secs)
+{
+	int ret;
+
+	__uaccess_begin();
+	ret =  __einit((void *)sigstruct, (void *)token, (void *)secs);
+	__uaccess_end();
+	return ret;
+}
+
+int sgx_einit(void __user *sigstruct, void __user *token,
+	      void __user *secs, u64 *lepubkeyhash, int *trapnr)
+{
+	int ret;
+
+	if (!boot_cpu_has(X86_FEATURE_SGX_LC)) {
+		ret = __sgx_einit(sigstruct, token, secs);
+	} else {
+		preempt_disable();
+		sgx_update_lepubkeyhash_msrs(lepubkeyhash, false);
+		ret = __sgx_einit(sigstruct, token, secs);
+		if (ret == SGX_INVALID_EINITTOKEN) {
+			sgx_update_lepubkeyhash_msrs(lepubkeyhash, true);
+			ret = __sgx_einit(sigstruct, token, secs);
+		}
+		preempt_enable();
+	}
+
+	if (encls_faulted(ret)) {
+		*trapnr = ENCLS_TRAPNR(ret);
+		return -EFAULT;
+	}
+	return ret;
+}
+EXPORT_SYMBOL_GPL(sgx_einit);
+#endif
-- 
2.22.0


  parent reply index

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-27  5:51 [RFC PATCH 00/21] x86/sgx: KVM: Add SGX virtualization Sean Christopherson
2019-07-27  5:51 ` [RFC PATCH 01/21] x86/sgx: Add defines for SGX device minor numbers Sean Christopherson
2019-07-27  5:51 ` [RFC PATCH 02/21] x86/sgx: Move bus registration and device init to common code Sean Christopherson
2019-07-27  5:51 ` [RFC PATCH 03/21] x86/sgx: Move provisioning device " Sean Christopherson
2019-07-27  5:51 ` [RFC PATCH 04/21] x86/sgx: Add /dev/sgx/virt_epc device to allocate "raw" EPC for VMs Sean Christopherson
2019-07-27 17:44   ` Andy Lutomirski
2019-07-29 17:05     ` Sean Christopherson
2019-07-27  5:51 ` [RFC PATCH 05/21] x86/sgx: Expose SGX architectural definitions to the kernel Sean Christopherson
2019-07-27  5:51 ` [RFC PATCH 06/21] KVM: x86: Add SGX sub-features leaf to reverse CPUID table Sean Christopherson
2019-07-27  5:52 ` [RFC PATCH 07/21] KVM: x86: Add WARN_ON_ONCE(index!=0) in __do_cpuid_ent Sean Christopherson
2019-07-27  5:52 ` [RFC PATCH 08/21] KVM: x86: Add kvm_x86_ops hook to short circuit emulation Sean Christopherson
2019-07-27 17:38   ` Andy Lutomirski
2019-07-30  2:49     ` Sean Christopherson
2019-08-16  0:47       ` Andy Lutomirski
2019-08-19 22:01         ` Sean Christopherson
2019-08-20  1:34           ` Andy Lutomirski
2019-08-20  1:41             ` Sean Christopherson
2019-07-30  3:08   ` Sean Christopherson
2019-07-27  5:52 ` [RFC PATCH 09/21] KVM: VMX: Add basic handling of VM-Exit from SGX enclave Sean Christopherson
2019-07-27  5:52 ` [RFC PATCH 10/21] KVM: x86: Export kvm_mmu_gva_to_gpa_{read,write}() for VMX/SGX Sean Christopherson
2019-07-27  5:52 ` [RFC PATCH 11/21] KVM: x86: Export kvm_propagate_fault (as kvm_propagate_page_fault) Sean Christopherson
2019-07-27  5:52 ` [RFC PATCH 12/21] KVM: x86: Define new #PF SGX error code bit Sean Christopherson
2019-07-27  5:52 ` [RFC PATCH 13/21] x86/sgx: Move the intermediate EINIT helper into the driver Sean Christopherson
2019-07-27  5:52 ` Sean Christopherson [this message]
2019-07-27  5:52 ` [RFC PATCH 15/21] KVM: VMX: Add SGX ENCLS[ECREATE] handler to enforce CPUID restrictions Sean Christopherson
2019-07-27  5:52 ` [RFC PATCH 16/21] KVM: VMX: Edd emulation of SGX Launch Control LE hash MSRs Sean Christopherson
2019-07-27  5:52 ` [RFC PATCH 17/21] KVM: VMX: Add handler for ENCLS[EINIT] to support SGX Launch Control Sean Christopherson
2019-07-27  5:52 ` [RFC PATCH 18/21] KVM: x86: Invoke kvm_x86_ops->cpuid_update() after kvm_update_cpuid() Sean Christopherson
2019-07-27  5:52 ` [RFC PATCH 19/21] KVM: VMX: Enable SGX virtualization for SGX1, SGX2 and LC Sean Christopherson
2019-07-27  5:52 ` [RFC PATCH 20/21] x86/sgx: Export sgx_set_attribute() for use by KVM Sean Christopherson
2019-07-27  5:52 ` [RFC PATCH 21/21] KVM: x86: Add capability to grant VM access to privileged SGX attribute Sean Christopherson
2019-07-27 17:32   ` Andy Lutomirski

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