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Enable FSGSBASE in Linux-SGX driver for Linux < 4.0.0

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This commit is contained in:
Chia-Che Tsai
2016-08-10 18:25:41 -04:00
parent cdba666030
commit 3f1f052d00
1 changed files with 5 additions and 1 deletions
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Pal/src/host/Linux-SGX/sgx-driver/gsgx_main.c
+5 -1
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@@ -42,6 +42,10 @@ static long gsgx_ioctl_enclave_create(struct file *filep, unsigned int cmd,
old_mmap_min_addr = 0;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0)
write_cr4(read_cr4() | X86_CR4_FSGSBASE);
#endif
isgx_create.secs = createp->secs;
filep->private_data = (void *) createp->addr;
@@ -258,7 +262,6 @@ static int gsgx_setup(void)
for_each_online_cpu(cpu) {
per_cpu(cpu_tlbstate.cr4, cpu) |= X86_CR4_FSGSBASE;
}
#else
#endif
return 0;
@@ -268,6 +271,7 @@ static void gsgx_teardown(void)
{
if (gsgx_dev.this_device)
misc_deregister(&gsgx_dev);
if (isgx_dev)
filp_close(isgx_dev, NULL);
}