Oops.. Please ignore this patch :)
Thanks,
-Kai
On 5/8/2017 5:24 PM, Kai Huang wrote:
even this bit is not set by BIOS, current ucode patch allows write to
IA32_SGXLEPUBKEYHASHn.
---
arch/x86/kvm/vmx.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 1022295ba925..9e687ce45b48 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2254,12 +2254,20 @@ static void decache_tsc_multiplier(struct vcpu_vmx *vmx)
vmcs_write64(TSC_MULTIPLIER, vmx->current_tsc_ratio);
}
+#define UCODE_PATCH
static bool cpu_sgx_lepubkeyhash_writable(void)
{
u64 val, sgx_lc_enabled_mask = (FEATURE_CONTROL_LOCKED |
FEATURE_CONTROL_SGX_LAUNCH_CONTROL_ENABLE);
rdmsrl(MSR_IA32_FEATURE_CONTROL, val);
+#ifdef UCODE_PATCH
+ /*
+ * current ucode patch can support write to IA32_SGXLEPUBKEYHASHn
+ * even if FEATURE_CONTROL[17] is not set.
+ */
+ val |= FEATURE_CONTROL_SGX_LAUNCH_CONTROL_ENABLE;
+#endif
return ((val & sgx_lc_enabled_mask) == sgx_lc_enabled_mask);
}
