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Message-Id: <20180608171216.26521-9-jarkko.sakkinen@linux.intel.com>
Date: Fri, 8 Jun 2018 19:09:43 +0200
From: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To: x86@...nel.org, platform-driver-x86@...r.kernel.org
Cc: dave.hansen@...el.com, sean.j.christopherson@...el.com,
nhorman@...hat.com, npmccallum@...hat.com,
Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
linux-kernel@...r.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND
64-BIT)), intel-sgx-kernel-dev@...ts.01.org (open list:INTEL SGX)
Subject: [PATCH v11 08/13] x86, sgx: added ENCLS wrappers
This commit adds wrappers for Intel(R) SGX ENCLS opcode functionality.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
arch/x86/include/asm/sgx.h | 198 +++++++++++++++++++++++++++++++++++++
1 file changed, 198 insertions(+)
diff --git a/arch/x86/include/asm/sgx.h b/arch/x86/include/asm/sgx.h
index fa3e6e0eb8af..a2f727f85b91 100644
--- a/arch/x86/include/asm/sgx.h
+++ b/arch/x86/include/asm/sgx.h
@@ -10,6 +10,10 @@
#ifndef _ASM_X86_SGX_H
#define _ASM_X86_SGX_H
+#include <asm/sgx_arch.h>
+#include <asm/asm.h>
+#include <linux/bitops.h>
+#include <linux/err.h>
#include <linux/types.h>
#define SGX_CPUID 0x12
@@ -20,6 +24,200 @@ enum sgx_cpuid {
SGX_CPUID_EPC_BANKS = 2,
};
+enum sgx_commands {
+ ECREATE = 0x0,
+ EADD = 0x1,
+ EINIT = 0x2,
+ EREMOVE = 0x3,
+ EDGBRD = 0x4,
+ EDGBWR = 0x5,
+ EEXTEND = 0x6,
+ ELDU = 0x8,
+ EBLOCK = 0x9,
+ EPA = 0xA,
+ EWB = 0xB,
+ ETRACK = 0xC,
+ EAUG = 0xD,
+ EMODPR = 0xE,
+ EMODT = 0xF,
+};
+
+#define IS_ENCLS_FAULT(r) ((r) & 0xffff0000)
+#define ENCLS_FAULT_VECTOR(r) ((r) >> 16)
+
+#define ENCLS_TO_ERR(r) (IS_ENCLS_FAULT(r) ? -EFAULT : \
+ (r) == SGX_UNMASKED_EVENT ? -EINTR : \
+ (r) == SGX_MAC_COMPARE_FAIL ? -EIO : \
+ (r) == SGX_ENTRYEPOCH_LOCKED ? -EBUSY : -EPERM)
+
+#define __encls_ret_N(rax, inputs...) \
+ ({ \
+ int ret; \
+ asm volatile( \
+ "1: .byte 0x0f, 0x01, 0xcf;\n\t" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3: shll $16,%%eax\n" \
+ " jmp 2b\n" \
+ ".previous\n" \
+ _ASM_EXTABLE_FAULT(1b, 3b) \
+ : "=a"(ret) \
+ : "a"(rax), inputs \
+ : "memory"); \
+ ret; \
+ })
+
+#define __encls_ret_1(rax, rcx) \
+ ({ \
+ __encls_ret_N(rax, "c"(rcx)); \
+ })
+
+#define __encls_ret_2(rax, rbx, rcx) \
+ ({ \
+ __encls_ret_N(rax, "b"(rbx), "c"(rcx)); \
+ })
+
+#define __encls_ret_3(rax, rbx, rcx, rdx) \
+ ({ \
+ __encls_ret_N(rax, "b"(rbx), "c"(rcx), "d"(rdx)); \
+ })
+
+#define __encls_N(rax, rbx_out, inputs...) \
+ ({ \
+ int ret; \
+ asm volatile( \
+ "1: .byte 0x0f, 0x01, 0xcf;\n\t" \
+ " xor %%eax,%%eax;\n" \
+ "2:\n" \
+ ".section .fixup,\"ax\"\n" \
+ "3: shll $16,%%eax\n" \
+ " jmp 2b\n" \
+ ".previous\n" \
+ _ASM_EXTABLE_FAULT(1b, 3b) \
+ : "=a"(ret), "=b"(rbx_out) \
+ : "a"(rax), inputs \
+ : "memory"); \
+ ret; \
+ })
+
+#define __encls_2(rax, rbx, rcx) \
+ ({ \
+ unsigned long ign_rbx_out; \
+ __encls_N(rax, ign_rbx_out, "b"(rbx), "c"(rcx)); \
+ })
+
+#define __encls_1_1(rax, data, rcx) \
+ ({ \
+ unsigned long rbx_out; \
+ int ret = __encls_N(rax, rbx_out, "c"(rcx)); \
+ if (!ret) \
+ data = rbx_out; \
+ ret; \
+ })
+
+static inline int __ecreate(struct sgx_pageinfo *pginfo, void *secs)
+{
+ return __encls_2(ECREATE, pginfo, secs);
+}
+
+static inline int __eextend(void *secs, void *epc)
+{
+ return __encls_2(EEXTEND, secs, epc);
+}
+
+static inline int __eadd(struct sgx_pageinfo *pginfo, void *epc)
+{
+ return __encls_2(EADD, pginfo, epc);
+}
+
+static inline int __einit(void *sigstruct, struct sgx_einittoken *einittoken,
+ void *secs)
+{
+ return __encls_ret_3(EINIT, sigstruct, secs, einittoken);
+}
+
+static inline int __eremove(void *epc)
+{
+ return __encls_ret_1(EREMOVE, epc);
+}
+
+static inline int __edbgwr(unsigned long addr, unsigned long *data)
+{
+ return __encls_2(EDGBWR, *data, addr);
+}
+
+static inline int __edbgrd(unsigned long addr, unsigned long *data)
+{
+ return __encls_1_1(EDGBRD, *data, addr);
+}
+
+static inline int __etrack(void *epc)
+{
+ return __encls_ret_1(ETRACK, epc);
+}
+
+static inline int __eldu(struct sgx_pageinfo *pginfo, void *epc, void *va)
+{
+ return __encls_ret_3(ELDU, pginfo, epc, va);
+}
+
+static inline int __eblock(void *epc)
+{
+ return __encls_ret_1(EBLOCK, epc);
+}
+
+static inline int __epa(void *epc)
+{
+ unsigned long rbx = SGX_PAGE_TYPE_VA;
+
+ return __encls_2(EPA, rbx, epc);
+}
+
+static inline int __ewb(struct sgx_pageinfo *pginfo, void *epc, void *va)
+{
+ return __encls_ret_3(EWB, pginfo, epc, va);
+}
+
+static inline int __eaug(struct sgx_pageinfo *pginfo, void *epc)
+{
+ return __encls_2(EAUG, pginfo, epc);
+}
+
+static inline int __emodpr(struct sgx_secinfo *secinfo, void *epc)
+{
+ return __encls_ret_2(EMODPR, secinfo, epc);
+}
+
+static inline int __emodt(struct sgx_secinfo *secinfo, void *epc)
+{
+ return __encls_ret_2(EMODT, secinfo, epc);
+}
+
extern bool sgx_enabled;
+#define SGX_FN(name, params...) \
+{ \
+ void *epc; \
+ int ret; \
+ epc = sgx_get_page(epc_page); \
+ ret = __##name(params); \
+ sgx_put_page(epc); \
+ return ret; \
+}
+
+#define BUILD_SGX_FN(fn, name) \
+static inline int fn(struct sgx_epc_page *epc_page) \
+ SGX_FN(name, epc)
+BUILD_SGX_FN(sgx_eremove, eremove)
+BUILD_SGX_FN(sgx_eblock, eblock)
+BUILD_SGX_FN(sgx_etrack, etrack)
+BUILD_SGX_FN(sgx_epa, epa)
+
+static inline int sgx_emodpr(struct sgx_secinfo *secinfo,
+ struct sgx_epc_page *epc_page)
+ SGX_FN(emodpr, secinfo, epc)
+static inline int sgx_emodt(struct sgx_secinfo *secinfo,
+ struct sgx_epc_page *epc_page)
+ SGX_FN(emodt, secinfo, epc)
+
#endif /* _ASM_X86_SGX_H */
--
2.17.0
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