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x86/sgx: Add encls_faulted() helper

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Add a helper to extract the fault indicator from an encoded ENCLS return
value.  SGX virtualization will also need to detect ENCLS faults.

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>
Acked-by: Dave Hansen <dave.hansen@intel.com>
Link: https://lkml.kernel.org/r/c1f955898110de2f669da536fc6cf62e003dff88.1616136308.git.kai.huang@intel.com
This commit is contained in:
Sean Christopherson 2021-03-19 20:23:06 +13:00 • committed by Borislav Petkov
parent 32ddda8e44
commit a67136b458
2 changed files with 15 additions and 2 deletions
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15
arch/x86/kernel/cpu/sgx/encls.h
View file

@ -40,6 +40,19 @@
} while (0); \
}
/*
* encls_faulted() - Check if an ENCLS leaf faulted given an error code
* @ret: the return value of an ENCLS leaf function call
*
* Return:
* - true: ENCLS leaf faulted.
* - false: Otherwise.
*/
static inline bool encls_faulted(int ret)
{
return ret & ENCLS_FAULT_FLAG;
}
/**
* encls_failed() - Check if an ENCLS function failed
* @ret: the return value of an ENCLS function call
@ -50,7 +63,7 @@
*/
static inline bool encls_failed(int ret)
{
if (ret & ENCLS_FAULT_FLAG)
if (encls_faulted(ret))
return ENCLS_TRAPNR(ret) != X86_TRAP_PF;
return !!ret;

2
arch/x86/kernel/cpu/sgx/ioctl.c
View file

@ -568,7 +568,7 @@ static int sgx_encl_init(struct sgx_encl *encl, struct sgx_sigstruct *sigstruct,
}
}
if (ret & ENCLS_FAULT_FLAG) {
if (encls_faulted(ret)) {
if (encls_failed(ret))
ENCLS_WARN(ret, "EINIT");