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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2021-03-19 10:23:08 +0300 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-04-06 20:18:27 +0300 |
| commit | d155030b1e7c0e448aab22a803f7a71ea2e117d7 (patch) | |
| tree | d6275581b9dfe86a20b9e31484d6c4dea42c8f12 /arch/x86/include/asm/sgx.h | |
| parent | 73916b6a0c714258f9c2619408a66c6696a761a7 (diff) | |
| download | linux-d155030b1e7c0e448aab22a803f7a71ea2e117d7.tar.xz | |
x86/sgx: Add helpers to expose ECREATE and EINIT to KVM
The host kernel must intercept ECREATE to impose policies on guests, and
intercept EINIT to be able to write guest's virtual SGX_LEPUBKEYHASH MSR
values to hardware before running guest's EINIT so it can run correctly
according to hardware behavior.
Provide wrappers around __ecreate() and __einit() to hide the ugliness
of overloading the ENCLS return value to encode multiple error formats
in a single int. KVM will trap-and-execute ECREATE and EINIT as part
of SGX virtualization, and reflect ENCLS execution result to guest by
setting up guest's GPRs, or on an exception, injecting the correct fault
based on return value of __ecreate() and __einit().
Use host userspace addresses (provided by KVM based on guest physical
address of ENCLS parameters) to execute ENCLS/EINIT when possible.
Accesses to both EPC and memory originating from ENCLS are subject to
segmentation and paging mechanisms. It's also possible to generate
kernel mappings for ENCLS parameters by resolving PFN but using
__uaccess_xx() is simpler.
[ bp: Return early if the __user memory accesses fail, use
cpu_feature_enabled(). ]
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Kai Huang <kai.huang@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Jarkko Sakkinen <jarkko@kernel.org>
Link: https://lkml.kernel.org/r/20e09daf559aa5e9e680a0b4b5fba940f1bad86e.1616136308.git.kai.huang@intel.com
Diffstat (limited to 'arch/x86/include/asm/sgx.h')
| -rw-r--r-- | arch/x86/include/asm/sgx.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/include/asm/sgx.h b/arch/x86/include/asm/sgx.h index 3b025afec0a7..954042e04102 100644 --- a/arch/x86/include/asm/sgx.h +++ b/arch/x86/include/asm/sgx.h @@ -365,4 +365,11 @@ struct sgx_sigstruct { * comment! */ +#ifdef CONFIG_X86_SGX_KVM +int sgx_virt_ecreate(struct sgx_pageinfo *pageinfo, void __user *secs, + int *trapnr); +int sgx_virt_einit(void __user *sigstruct, void __user *token, + void __user *secs, u64 *lepubkeyhash, int *trapnr); +#endif + #endif /* _ASM_X86_SGX_H */ |