Author: anish
Date: Mon Apr 11 05:09:43 2016
New Revision: 297806
URL: https://svnweb.freebsd.org/changeset/base/297806
Log:
Allow guest writes to AMD microcode update[0xc0010020] MSR without updating
actual hardware MSR. This allows guest microcode update to go through which
otherwise failing because wrmsr() was returning EINVAL.
Submitted by:Yamagi Burmeister
Approved by:grehan
MFC after:2 weeks
Modified:
head/sys/amd64/vmm/amd/svm_msr.c
Modified: head/sys/amd64/vmm/amd/svm_msr.c
==============================================================================
--- head/sys/amd64/vmm/amd/svm_msr.c Mon Apr 11 04:56:23 2016
(r297805)
+++ head/sys/amd64/vmm/amd/svm_msr.c Mon Apr 11 05:09:43 2016
(r297806)
@@ -156,6 +156,11 @@ svm_wrmsr(struct svm_softc *sc, int vcpu
* Ignore writes to the "Interrupt Pending Message" MSR.
*/
break;
+ case MSR_K8_UCODE_UPDATE:
+ /*
+ * Ignore writes to microcode update register.
+ */
+ break;
default:
error = EINVAL;
break;
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