The branch stable/13 has been updated by grehan:
URL:
https://cgit.FreeBSD.org/src/commit/?id=4bb2057c13b5894393034d82899c930e36c34153
commit 4bb2057c13b5894393034d82899c930e36c34153
Author: Corvin Köhne <c.koe...@beckhoff.com>
AuthorDate: 2021-04-15 03:49:19 +0000
Commit: Peter Grehan <gre...@freebsd.org>
CommitDate: 2021-06-28 10:08:56 +0000
bhyve: implement rdmsr for MSR_IA32_FEATURE_CONTROL
Without the -w option, Windows guests crash on boot. This is caused by a
rdmsr
of MSR_IA32_FEATURE_CONTROL. Windows checks this MSR to determine enabled
VMX
features. This MSR isn't emulated in bhyve, so a #GP exception is injected
which causes Windows to crash.
Fix by returning a rdmsr of MSR_IA32_FEATURE_CONTROL with Lock Bit set and
VMX disabled to informWindows that VMX isn't available.
(cherry picked from commit 17d214c2ca9f110db3fa2a10d6b448d624e87774)
---
usr.sbin/bhyve/xmsr.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/usr.sbin/bhyve/xmsr.c b/usr.sbin/bhyve/xmsr.c
index 0b87821836b7..1a7f98ee222a 100644
--- a/usr.sbin/bhyve/xmsr.c
+++ b/usr.sbin/bhyve/xmsr.c
@@ -124,6 +124,14 @@ emulate_rdmsr(struct vmctx *ctx, int vcpu, uint32_t num,
uint64_t *val)
*/
*val = 0x000a1003;
break;
+ case MSR_IA32_FEATURE_CONTROL:
+ /*
+ * Windows guests check this MSR.
+ * Set the lock bit to avoid writes
+ * to this MSR.
+ */
+ *val = IA32_FEATURE_CONTROL_LOCK;
+ break;
default:
error = -1;
break;
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