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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 13/21] x86/sgx: Move the intermediate EINIT helper into the driver
Date: Fri, 26 Jul 2019 22:52:06 -0700
Message-ID: <20190727055214.9282-14-sean.j.christopherson@intel.com> (raw)
In-Reply-To: <20190727055214.9282-1-sean.j.christopherson@intel.com>

Providing sgx_einit() in the common SGX code was a bit premature.  The
thought was that the native SGX driver and KVM would be able to use a
common EINIT helper, but that may or may not hold true depending on
how KVM's implementation shakes out.  For example, KVM may want to pass
user pointers directly to EINIT in order to avoid copying large amounts
of data to in-kernel temp structures.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/kernel/cpu/sgx/driver/ioctl.c | 21 +++++++++++--
 arch/x86/kernel/cpu/sgx/main.c         | 43 ++++++--------------------
 arch/x86/kernel/cpu/sgx/sgx.h          |  4 +--
 3 files changed, 30 insertions(+), 38 deletions(-)

diff --git a/arch/x86/kernel/cpu/sgx/driver/ioctl.c b/arch/x86/kernel/cpu/sgx/driver/ioctl.c
index b7aa06920d10..a1cb5f772363 100644
--- a/arch/x86/kernel/cpu/sgx/driver/ioctl.c
+++ b/arch/x86/kernel/cpu/sgx/driver/ioctl.c
@@ -658,6 +658,23 @@ static int sgx_get_key_hash(const void *modulus, void *hash)
 	return ret;
 }
 
+static int __sgx_einit(struct sgx_sigstruct *sigstruct,
+		       struct sgx_einittoken *token, struct sgx_epc_page *secs,
+		       u64 *lepubkeyhash)
+{
+	int ret;
+
+	preempt_disable();
+	sgx_update_lepubkeyhash_msrs(lepubkeyhash, false);
+	ret = __einit(sigstruct, token, sgx_epc_addr(secs));
+	if (ret == SGX_INVALID_EINITTOKEN) {
+		sgx_update_lepubkeyhash_msrs(lepubkeyhash, true);
+		ret = __einit(sigstruct, token, sgx_epc_addr(secs));
+	}
+	preempt_enable();
+	return ret;
+}
+
 static int sgx_encl_init(struct sgx_encl *encl, struct sgx_sigstruct *sigstruct,
 			 struct sgx_einittoken *token)
 {
@@ -686,8 +703,8 @@ static int sgx_encl_init(struct sgx_encl *encl, struct sgx_sigstruct *sigstruct,
 
 	for (i = 0; i < SGX_EINIT_SLEEP_COUNT; i++) {
 		for (j = 0; j < SGX_EINIT_SPIN_COUNT; j++) {
-			ret = sgx_einit(sigstruct, token, encl->secs.epc_page,
-					mrsigner);
+			ret = __sgx_einit(sigstruct, token,
+					  encl->secs.epc_page, mrsigner);
 			if (ret == SGX_UNMASKED_EVENT)
 				continue;
 			else
diff --git a/arch/x86/kernel/cpu/sgx/main.c b/arch/x86/kernel/cpu/sgx/main.c
index 532dd90e09e1..542427c6ae9c 100644
--- a/arch/x86/kernel/cpu/sgx/main.c
+++ b/arch/x86/kernel/cpu/sgx/main.c
@@ -166,7 +166,15 @@ void sgx_free_page(struct sgx_epc_page *page)
 	WARN(ret > 0, "sgx: EREMOVE returned %d (0x%x)", ret, ret);
 }
 
-static void sgx_update_lepubkeyhash_msrs(u64 *lepubkeyhash, bool enforce)
+/**
+ * sgx_update_lepubkeyhash_msrs - Write the IA32_SGXLEPUBKEYHASHx MSRs
+ * @lepubkeyhash:	array of desired MSRs values
+ * @enforce:		force WRMSR regardless of cache status
+ *
+ * Write the IA32_SGXLEPUBKEYHASHx MSRs according to @lepubkeyhash if the
+ * last cached value doesn't match the desired value, or if @enforce is %true.
+ */
+void sgx_update_lepubkeyhash_msrs(u64 *lepubkeyhash, bool enforce)
 {
 	u64 *cache;
 	int i;
@@ -180,39 +188,6 @@ static void sgx_update_lepubkeyhash_msrs(u64 *lepubkeyhash, bool enforce)
 	}
 }
 
-/**
- * sgx_einit - initialize an enclave
- * @sigstruct:		a pointer a SIGSTRUCT
- * @token:		a pointer an EINITTOKEN (optional)
- * @secs:		a pointer a SECS
- * @lepubkeyhash:	the desired value for IA32_SGXLEPUBKEYHASHx MSRs
- *
- * Execute ENCLS[EINIT], writing the IA32_SGXLEPUBKEYHASHx MSRs according
- * to @lepubkeyhash (if possible and necessary).
- *
- * Return:
- *   0 on success,
- *   -errno or SGX error on failure
- */
-int sgx_einit(struct sgx_sigstruct *sigstruct, struct sgx_einittoken *token,
-	      struct sgx_epc_page *secs, u64 *lepubkeyhash)
-{
-	int ret;
-
-	if (!boot_cpu_has(X86_FEATURE_SGX_LC))
-		return __einit(sigstruct, token, sgx_epc_addr(secs));
-
-	preempt_disable();
-	sgx_update_lepubkeyhash_msrs(lepubkeyhash, false);
-	ret = __einit(sigstruct, token, sgx_epc_addr(secs));
-	if (ret == SGX_INVALID_EINITTOKEN) {
-		sgx_update_lepubkeyhash_msrs(lepubkeyhash, true);
-		ret = __einit(sigstruct, token, sgx_epc_addr(secs));
-	}
-	preempt_enable();
-	return ret;
-}
-
 static __init void sgx_free_epc_section(struct sgx_epc_section *section)
 {
 	struct sgx_epc_page *page;
diff --git a/arch/x86/kernel/cpu/sgx/sgx.h b/arch/x86/kernel/cpu/sgx/sgx.h
index 748b1633d770..3f3311024bd0 100644
--- a/arch/x86/kernel/cpu/sgx/sgx.h
+++ b/arch/x86/kernel/cpu/sgx/sgx.h
@@ -85,8 +85,8 @@ void sgx_reclaim_pages(void);
 struct sgx_epc_page *sgx_alloc_page(void *owner, bool reclaim);
 int __sgx_free_page(struct sgx_epc_page *page);
 void sgx_free_page(struct sgx_epc_page *page);
-int sgx_einit(struct sgx_sigstruct *sigstruct, struct sgx_einittoken *token,
-	      struct sgx_epc_page *secs, u64 *lepubkeyhash);
+
+void sgx_update_lepubkeyhash_msrs(u64 *lepubkeyhash, bool enforce);
 
 #define SGX_ENCL_DEV_MINOR	0
 #define SGX_PROV_DEV_MINOR	1
-- 
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 ` Sean Christopherson [this message]
2019-07-27  5:52 ` [RFC PATCH 14/21] x86/sgx: Add helpers to expose ECREATE and EINIT to KVM Sean Christopherson
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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