Linux-Sgx Archive on lore.kernel.org
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From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: <x86@kernel.org>, <platform-driver-x86@vger.kernel.org>,
	<linux-sgx@vger.kernel.org>
Cc: <dave.hansen@intel.com>, <sean.j.christopherson@intel.com>,
	<nhorman@redhat.com>, <npmccallum@redhat.com>,
	<serge.ayoun@intel.com>, <shay.katz-zamir@intel.com>,
	<haitao.huang@intel.com>, <andriy.shevchenko@linux.intel.com>,
	<tglx@linutronix.de>, <kai.svahn@intel.com>,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	David Woodhouse <dwmw@amazon.co.uk>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Fenghua Yu <fenghua.yu@intel.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	"open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
	<linux-kernel@vger.kernel.org>
Subject: [PATCH v16 03/22] x86/cpufeatures: Add SGX sub-features (as Linux-defined bits)
Date: Tue, 6 Nov 2018 15:45:42 +0200
Message-ID: <20181106134758.10572-4-jarkko.sakkinen@linux.intel.com> (raw)
In-Reply-To: <20181106134758.10572-1-jarkko.sakkinen@linux.intel.com>

From: Sean Christopherson <sean.j.christopherson@intel.com>

CPUID_12_EAX is an Intel-defined feature bits leaf dedicated for SGX
that enumerates the SGX instruction sets that are supported by the
CPU, e.g. SGX1, SGX2, etc...  Because Linux currently only cares about
two bits (SGX1 and SGX2) and there are currently only four documented
bits in total, relocate the bits to Linux-defined word 8 to conserve
space.

But, keep the bit positions identical between the Intel-defined value
and the Linux-defined value, e.g. keep SGX1 at bit 0.  This allows KVM
to use its existing code for probing guest CPUID bits using Linux's
X86_FEATURE_* definitions.  To do so, shift around some existing bits
to effectively reserve bits 0-7 of word 8 for SGX sub-features.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 arch/x86/include/asm/cpufeatures.h       | 21 +++++++++++++++------
 arch/x86/kernel/cpu/scattered.c          |  2 ++
 tools/arch/x86/include/asm/cpufeatures.h | 21 +++++++++++++++------
 3 files changed, 32 insertions(+), 12 deletions(-)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 22271752fd1e..1b8dea9a06cb 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -222,12 +222,21 @@
 #define X86_FEATURE_L1TF_PTEINV		( 7*32+29) /* "" L1TF workaround PTE inversion */
 #define X86_FEATURE_IBRS_ENHANCED	( 7*32+30) /* Enhanced IBRS */
 
-/* Virtualization flags: Linux defined, word 8 */
-#define X86_FEATURE_TPR_SHADOW		( 8*32+ 0) /* Intel TPR Shadow */
-#define X86_FEATURE_VNMI		( 8*32+ 1) /* Intel Virtual NMI */
-#define X86_FEATURE_FLEXPRIORITY	( 8*32+ 2) /* Intel FlexPriority */
-#define X86_FEATURE_EPT			( 8*32+ 3) /* Intel Extended Page Table */
-#define X86_FEATURE_VPID		( 8*32+ 4) /* Intel Virtual Processor ID */
+/*
+ * Scattered Intel features: Linux defined, word 8.
+ *
+ * Note that the bit location of the SGX features is meaningful as KVM expects
+ * the Linux defined bit to match the Intel defined bit, e.g. X86_FEATURE_SGX1
+ * must remain at bit 0, SGX2 at bit 1, etc...
+ */
+#define X86_FEATURE_SGX1		( 8*32+ 0) /* SGX1 leaf functions */
+#define X86_FEATURE_SGX2		( 8*32+ 1) /* SGX2 leaf functions */
+
+#define X86_FEATURE_TPR_SHADOW		( 8*32+ 8) /* Intel TPR Shadow */
+#define X86_FEATURE_VNMI		( 8*32+ 9) /* Intel Virtual NMI */
+#define X86_FEATURE_FLEXPRIORITY	( 8*32+10) /* Intel FlexPriority */
+#define X86_FEATURE_EPT			( 8*32+11) /* Intel Extended Page Table */
+#define X86_FEATURE_VPID		( 8*32+12) /* Intel Virtual Processor ID */
 
 #define X86_FEATURE_VMMCALL		( 8*32+15) /* Prefer VMMCALL to VMCALL */
 #define X86_FEATURE_XENPV		( 8*32+16) /* "" Xen paravirtual guest */
diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c
index 772c219b6889..f7f0970b8f89 100644
--- a/arch/x86/kernel/cpu/scattered.c
+++ b/arch/x86/kernel/cpu/scattered.c
@@ -26,6 +26,8 @@ static const struct cpuid_bit cpuid_bits[] = {
 	{ X86_FEATURE_CDP_L3,		CPUID_ECX,  2, 0x00000010, 1 },
 	{ X86_FEATURE_CDP_L2,		CPUID_ECX,  2, 0x00000010, 2 },
 	{ X86_FEATURE_MBA,		CPUID_EBX,  3, 0x00000010, 0 },
+	{ X86_FEATURE_SGX1,             CPUID_EAX,  0, 0x00000012, 0 },
+	{ X86_FEATURE_SGX2,             CPUID_EAX,  1, 0x00000012, 0 },
 	{ X86_FEATURE_HW_PSTATE,	CPUID_EDX,  7, 0x80000007, 0 },
 	{ X86_FEATURE_CPB,		CPUID_EDX,  9, 0x80000007, 0 },
 	{ X86_FEATURE_PROC_FEEDBACK,    CPUID_EDX, 11, 0x80000007, 0 },
diff --git a/tools/arch/x86/include/asm/cpufeatures.h b/tools/arch/x86/include/asm/cpufeatures.h
index 89a048c2faec..9cc7628b9845 100644
--- a/tools/arch/x86/include/asm/cpufeatures.h
+++ b/tools/arch/x86/include/asm/cpufeatures.h
@@ -222,12 +222,21 @@
 #define X86_FEATURE_L1TF_PTEINV		( 7*32+29) /* "" L1TF workaround PTE inversion */
 #define X86_FEATURE_IBRS_ENHANCED	( 7*32+30) /* Enhanced IBRS */
 
-/* Virtualization flags: Linux defined, word 8 */
-#define X86_FEATURE_TPR_SHADOW		( 8*32+ 0) /* Intel TPR Shadow */
-#define X86_FEATURE_VNMI		( 8*32+ 1) /* Intel Virtual NMI */
-#define X86_FEATURE_FLEXPRIORITY	( 8*32+ 2) /* Intel FlexPriority */
-#define X86_FEATURE_EPT			( 8*32+ 3) /* Intel Extended Page Table */
-#define X86_FEATURE_VPID		( 8*32+ 4) /* Intel Virtual Processor ID */
+/*
+ * Scattered Intel features: Linux defined, word 8.
+ *
+ * Note that the bit numbers of the SGX features are meaningful as KVM expects
+ * the Linux defined bit to match the Intel defined bit, e.g. X86_FEATURE_SGX1
+ * must remain at bit 0, SGX2 at bit 1, etc...
+ */
+#define X86_FEATURE_SGX1		( 8*32+ 0) /* SGX1 leaf functions */
+#define X86_FEATURE_SGX2		( 8*32+ 1) /* SGX2 leaf functions */
+
+#define X86_FEATURE_TPR_SHADOW		( 8*32+ 8) /* Intel TPR Shadow */
+#define X86_FEATURE_VNMI		( 8*32+ 9) /* Intel Virtual NMI */
+#define X86_FEATURE_FLEXPRIORITY	( 8*32+10) /* Intel FlexPriority */
+#define X86_FEATURE_EPT			( 8*32+11) /* Intel Extended Page Table */
+#define X86_FEATURE_VPID		( 8*32+12) /* Intel Virtual Processor ID */
 
 #define X86_FEATURE_VMMCALL		( 8*32+15) /* Prefer VMMCALL to VMCALL */
 #define X86_FEATURE_XENPV		( 8*32+16) /* "" Xen paravirtual guest */
-- 
2.19.1

From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: x86@kernel.org, platform-driver-x86@vger.kernel.org,
	linux-sgx@vger.kernel.org
Cc: dave.hansen@intel.com, sean.j.christopherson@intel.com,
	nhorman@redhat.com, npmccallum@redhat.com, serge.ayoun@intel.com,
	shay.katz-zamir@intel.com, haitao.huang@intel.com,
	andriy.shevchenko@linux.intel.com, tglx@linutronix.de,
	kai.svahn@intel.com,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	David Woodhouse <dwmw@amazon.co.uk>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Fenghua Yu <fenghua.yu@intel.com>,
	Tom Lendacky <thomas.lendacky@amd.com>,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	linux-kernel@vger.kernel.org (open list:X86 ARCHITECTURE (32-BIT
	AND 64-BIT))
Subject: [PATCH v16 03/22] x86/cpufeatures: Add SGX sub-features (as Linux-defined bits)
Date: Tue,  6 Nov 2018 15:45:42 +0200
Message-ID: <20181106134758.10572-4-jarkko.sakkinen@linux.intel.com> (raw)
Message-ID: <20181106134542.lhm60U8hgqDAhel_EZ7ELokQfuhKd4IJ-sfIepXN2qk@z> (raw)
In-Reply-To: <20181106134758.10572-1-jarkko.sakkinen@linux.intel.com>

From: Sean Christopherson <sean.j.christopherson@intel.com>

CPUID_12_EAX is an Intel-defined feature bits leaf dedicated for SGX
that enumerates the SGX instruction sets that are supported by the
CPU, e.g. SGX1, SGX2, etc...  Because Linux currently only cares about
two bits (SGX1 and SGX2) and there are currently only four documented
bits in total, relocate the bits to Linux-defined word 8 to conserve
space.

But, keep the bit positions identical between the Intel-defined value
and the Linux-defined value, e.g. keep SGX1 at bit 0.  This allows KVM
to use its existing code for probing guest CPUID bits using Linux's
X86_FEATURE_* definitions.  To do so, shift around some existing bits
to effectively reserve bits 0-7 of word 8 for SGX sub-features.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
 arch/x86/include/asm/cpufeatures.h       | 21 +++++++++++++++------
 arch/x86/kernel/cpu/scattered.c          |  2 ++
 tools/arch/x86/include/asm/cpufeatures.h | 21 +++++++++++++++------
 3 files changed, 32 insertions(+), 12 deletions(-)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 22271752fd1e..1b8dea9a06cb 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -222,12 +222,21 @@
 #define X86_FEATURE_L1TF_PTEINV		( 7*32+29) /* "" L1TF workaround PTE inversion */
 #define X86_FEATURE_IBRS_ENHANCED	( 7*32+30) /* Enhanced IBRS */
 
-/* Virtualization flags: Linux defined, word 8 */
-#define X86_FEATURE_TPR_SHADOW		( 8*32+ 0) /* Intel TPR Shadow */
-#define X86_FEATURE_VNMI		( 8*32+ 1) /* Intel Virtual NMI */
-#define X86_FEATURE_FLEXPRIORITY	( 8*32+ 2) /* Intel FlexPriority */
-#define X86_FEATURE_EPT			( 8*32+ 3) /* Intel Extended Page Table */
-#define X86_FEATURE_VPID		( 8*32+ 4) /* Intel Virtual Processor ID */
+/*
+ * Scattered Intel features: Linux defined, word 8.
+ *
+ * Note that the bit location of the SGX features is meaningful as KVM expects
+ * the Linux defined bit to match the Intel defined bit, e.g. X86_FEATURE_SGX1
+ * must remain at bit 0, SGX2 at bit 1, etc...
+ */
+#define X86_FEATURE_SGX1		( 8*32+ 0) /* SGX1 leaf functions */
+#define X86_FEATURE_SGX2		( 8*32+ 1) /* SGX2 leaf functions */
+
+#define X86_FEATURE_TPR_SHADOW		( 8*32+ 8) /* Intel TPR Shadow */
+#define X86_FEATURE_VNMI		( 8*32+ 9) /* Intel Virtual NMI */
+#define X86_FEATURE_FLEXPRIORITY	( 8*32+10) /* Intel FlexPriority */
+#define X86_FEATURE_EPT			( 8*32+11) /* Intel Extended Page Table */
+#define X86_FEATURE_VPID		( 8*32+12) /* Intel Virtual Processor ID */
 
 #define X86_FEATURE_VMMCALL		( 8*32+15) /* Prefer VMMCALL to VMCALL */
 #define X86_FEATURE_XENPV		( 8*32+16) /* "" Xen paravirtual guest */
diff --git a/arch/x86/kernel/cpu/scattered.c b/arch/x86/kernel/cpu/scattered.c
index 772c219b6889..f7f0970b8f89 100644
--- a/arch/x86/kernel/cpu/scattered.c
+++ b/arch/x86/kernel/cpu/scattered.c
@@ -26,6 +26,8 @@ static const struct cpuid_bit cpuid_bits[] = {
 	{ X86_FEATURE_CDP_L3,		CPUID_ECX,  2, 0x00000010, 1 },
 	{ X86_FEATURE_CDP_L2,		CPUID_ECX,  2, 0x00000010, 2 },
 	{ X86_FEATURE_MBA,		CPUID_EBX,  3, 0x00000010, 0 },
+	{ X86_FEATURE_SGX1,             CPUID_EAX,  0, 0x00000012, 0 },
+	{ X86_FEATURE_SGX2,             CPUID_EAX,  1, 0x00000012, 0 },
 	{ X86_FEATURE_HW_PSTATE,	CPUID_EDX,  7, 0x80000007, 0 },
 	{ X86_FEATURE_CPB,		CPUID_EDX,  9, 0x80000007, 0 },
 	{ X86_FEATURE_PROC_FEEDBACK,    CPUID_EDX, 11, 0x80000007, 0 },
diff --git a/tools/arch/x86/include/asm/cpufeatures.h b/tools/arch/x86/include/asm/cpufeatures.h
index 89a048c2faec..9cc7628b9845 100644
--- a/tools/arch/x86/include/asm/cpufeatures.h
+++ b/tools/arch/x86/include/asm/cpufeatures.h
@@ -222,12 +222,21 @@
 #define X86_FEATURE_L1TF_PTEINV		( 7*32+29) /* "" L1TF workaround PTE inversion */
 #define X86_FEATURE_IBRS_ENHANCED	( 7*32+30) /* Enhanced IBRS */
 
-/* Virtualization flags: Linux defined, word 8 */
-#define X86_FEATURE_TPR_SHADOW		( 8*32+ 0) /* Intel TPR Shadow */
-#define X86_FEATURE_VNMI		( 8*32+ 1) /* Intel Virtual NMI */
-#define X86_FEATURE_FLEXPRIORITY	( 8*32+ 2) /* Intel FlexPriority */
-#define X86_FEATURE_EPT			( 8*32+ 3) /* Intel Extended Page Table */
-#define X86_FEATURE_VPID		( 8*32+ 4) /* Intel Virtual Processor ID */
+/*
+ * Scattered Intel features: Linux defined, word 8.
+ *
+ * Note that the bit numbers of the SGX features are meaningful as KVM expects
+ * the Linux defined bit to match the Intel defined bit, e.g. X86_FEATURE_SGX1
+ * must remain at bit 0, SGX2 at bit 1, etc...
+ */
+#define X86_FEATURE_SGX1		( 8*32+ 0) /* SGX1 leaf functions */
+#define X86_FEATURE_SGX2		( 8*32+ 1) /* SGX2 leaf functions */
+
+#define X86_FEATURE_TPR_SHADOW		( 8*32+ 8) /* Intel TPR Shadow */
+#define X86_FEATURE_VNMI		( 8*32+ 9) /* Intel Virtual NMI */
+#define X86_FEATURE_FLEXPRIORITY	( 8*32+10) /* Intel FlexPriority */
+#define X86_FEATURE_EPT			( 8*32+11) /* Intel Extended Page Table */
+#define X86_FEATURE_VPID		( 8*32+12) /* Intel Virtual Processor ID */
 
 #define X86_FEATURE_VMMCALL		( 8*32+15) /* Prefer VMMCALL to VMCALL */
 #define X86_FEATURE_XENPV		( 8*32+16) /* "" Xen paravirtual guest */
-- 
2.19.1


  parent reply index

Thread overview: 61+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-06 13:45 [PATCH v16 00/22] Intel SGX1 support Jarkko Sakkinen
2018-11-06 13:45 ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 01/22] x86/sgx: Update MAINTAINERS Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 02/22] x86/cpufeatures: Add Intel-defined SGX feature bit Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` Jarkko Sakkinen [this message]
2018-11-06 13:45   ` [PATCH v16 03/22] x86/cpufeatures: Add SGX sub-features (as Linux-defined bits) Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 04/22] x86/msr: Add IA32_FEATURE_CONTROL.SGX_ENABLE definition Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 05/22] x86/cpufeatures: Add Intel-defined SGX_LC feature bit Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 06/22] x86/cpu/intel: Detect SGX support and update caps appropriately Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:58   ` Sean Christopherson
2018-11-06 13:58     ` Sean Christopherson
2018-11-07 15:58     ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 07/22] x86/mm: x86/sgx: Add new 'PF_SGX' page fault error code bit Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 08/22] x86/mm: x86/sgx: Signal SIGSEGV for userspace #PFs w/ PF_SGX Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 09/22] x86/sgx: Define SGX1 and SGX2 ENCLS leafs Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 10/22] x86/sgx: Add ENCLS architectural error codes Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 11/22] x86/sgx: Add SGX1 and SGX2 architectural data structures Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 12/22] x86/sgx: Add definitions for SGX's CPUID leaf and variable sub-leafs Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 13/22] x86/msr: Add SGX Launch Control MSR definitions Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 14/22] x86/sgx: Add wrappers for ENCLS leaf functions Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 15/22] x86/sgx: Enumerate and track EPC sections Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 16/22] x86/sgx: Add functions to allocate and free EPC pages Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 17/22] x86/sgx: Add sgx_einit() for initializing enclaves Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 18/22] platform/x86: Intel SGX driver Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 16:40   ` Sean Christopherson
2018-11-06 16:57     ` Dave Hansen
2018-11-07 16:37     ` Jarkko Sakkinen
2018-11-07 18:00       ` Sean Christopherson
2018-11-07 18:00         ` Sean Christopherson
2018-11-08 14:46         ` Jarkko Sakkinen
2018-11-15 20:00           ` Jarkko Sakkinen
2018-11-15 20:04             ` Jarkko Sakkinen
2018-11-15 20:16               ` Jarkko Sakkinen
2018-11-21 11:46                 ` Jarkko Sakkinen
2018-11-07 10:29   ` David Laight
2018-11-06 13:45 ` [PATCH v16 19/22] platform/x86: sgx: Add swapping functionality to the " Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:45 ` [PATCH v16 20/22] x86/sgx: Add a simple swapper for the EPC memory manager Jarkko Sakkinen
2018-11-06 13:45   ` Jarkko Sakkinen
2018-11-06 13:46 ` [PATCH v16 21/22] platform/x86: ptrace() support for the SGX driver Jarkko Sakkinen
2018-11-06 13:46   ` Jarkko Sakkinen
2018-11-06 13:46 ` [PATCH v16 22/22] x86/sgx: SGX documentation Jarkko Sakkinen
2018-11-06 13:46   ` Jarkko Sakkinen
2018-11-27 20:13   ` Pavel Machek

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