Re: [PATCH 11/11] kvm: vmx: workaround FEATURE_CONTROL[17] is not set by BIOS

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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);
 }




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