diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 7882c54bc1..b848e535e6 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -2010,6 +2010,7 @@
<tlbflush state='on'/>
<ipi state='on'/>
<evmcs state='on'/>
+ <msrs unknown='ignore'/>
</hyperv>
<kvm>
<hidden state='on'/>
@@ -2307,6 +2308,15 @@
defined, the hypervisor default will be used.
Since 4.10.0 (QEMU/KVM only)
+
msrs
+ Some guests might require ignoring unknown
+ Model Specific Registers (MSRs) reads and writes. It's possible
+ to switch this by setting unknown
attribute
+ of msrs
to ignore
. If the attribute is
+ not defined, or set to fault
, unknown reads and writes
+ will not be ignored.
+ Since 5.1.0 (bhyve only)
+
diff --git a/src/bhyve/bhyve_command.c b/src/bhyve/bhyve_command.c
index 1f215dac08..52ad3e3714 100644
--- a/src/bhyve/bhyve_command.c
+++ b/src/bhyve/bhyve_command.c
@@ -506,6 +506,10 @@ virBhyveProcessBuildBhyveCmd(virConnectPtr conn,
virCommandAddArg(cmd, "-A"); /* Create an ACPI table */
if (def->features[VIR_DOMAIN_FEATURE_APIC] == VIR_TRISTATE_SWITCH_ON)
virCommandAddArg(cmd, "-I"); /* Present ioapic to the guest */
+ if (def->features[VIR_DOMAIN_FEATURE_MSRS] == VIR_TRISTATE_SWITCH_ON) {
+ if (def->msrs_features[VIR_DOMAIN_MSRS_UNKNOWN] == VIR_DOMAIN_MSRS_UNKNOWN_IGNORE)
+ virCommandAddArg(cmd, "-w");
+ }
switch (def->clock.offset) {
case VIR_DOMAIN_CLOCK_OFFSET_LOCALTIME:
diff --git a/tests/bhyvexml2argvdata/bhyvexml2argv-msrs.args b/tests/bhyvexml2argvdata/bhyvexml2argv-msrs.args
new file mode 100644
index 0000000000..dbe377421b
--- /dev/null
+++ b/tests/bhyvexml2argvdata/bhyvexml2argv-msrs.args
@@ -0,0 +1,10 @@
+/usr/sbin/bhyve \
+-c 1 \
+-m 214 \
+-w \
+-u \
+-H \
+-P \
+-s 0:0,hostbridge \
+-s 2:0,ahci,hd:/tmp/freebsd.img \
+-s 3:0,virtio-net,faketapdev,mac=52:54:00:b9:94:02 bhyve
diff --git a/tests/bhyvexml2argvdata/bhyvexml2argv-msrs.ldargs b/tests/bhyvexml2argvdata/bhyvexml2argv-msrs.ldargs
new file mode 100644
index 0000000000..32538b558e
--- /dev/null
+++ b/tests/bhyvexml2argvdata/bhyvexml2argv-msrs.ldargs
@@ -0,0 +1,3 @@
+/usr/sbin/bhyveload \
+-m 214 \
+-d /tmp/freebsd.img bhyve
diff --git a/tests/bhyvexml2argvdata/bhyvexml2argv-msrs.xml b/tests/bhyvexml2argvdata/bhyvexml2argv-msrs.xml
new file mode 100644
index 0000000000..dc9de93abc
--- /dev/null
+++ b/tests/bhyvexml2argvdata/bhyvexml2argv-msrs.xml
@@ -0,0 +1,26 @@
+
+ bhyve
+ df3be7e7-a104-11e3-aeb0-50e5492bd3dc
+ 219136
+ 1
+
+ hvm
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/tests/bhyvexml2argvtest.c b/tests/bhyvexml2argvtest.c
index 4a7f65a8e2..c84925c57b 100644
--- a/tests/bhyvexml2argvtest.c
+++ b/tests/bhyvexml2argvtest.c
@@ -211,6 +211,7 @@ mymain(void)
DO_TEST("cputopology");
DO_TEST_FAILURE("cputopology-nvcpu-mismatch");
DO_TEST("commandline");
+ DO_TEST("msrs");
/* Address allocation tests */
DO_TEST("addr-single-sata-disk");
diff --git a/tests/bhyvexml2xmloutdata/bhyvexml2xmlout-msrs.xml b/tests/bhyvexml2xmloutdata/bhyvexml2xmlout-msrs.xml
new file mode 100644
index 0000000000..7c8594fed8
--- /dev/null
+++ b/tests/bhyvexml2xmloutdata/bhyvexml2xmlout-msrs.xml
@@ -0,0 +1,36 @@
+
+ bhyve
+ df3be7e7-a104-11e3-aeb0-50e5492bd3dc
+ 219136
+ 219136
+ 1
+
+ hvm
+
+
+
+
+
+
+ destroy
+ restart
+ destroy
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
diff --git a/tests/bhyvexml2xmltest.c b/tests/bhyvexml2xmltest.c
index ed421b8839..e8a6867fcd 100644
--- a/tests/bhyvexml2xmltest.c
+++ b/tests/bhyvexml2xmltest.c
@@ -111,6 +111,7 @@ mymain(void)
DO_TEST_DIFFERENT("vnc-vgaconf-io");
DO_TEST_DIFFERENT("vnc-autoport");
DO_TEST_DIFFERENT("commandline");
+ DO_TEST_DIFFERENT("msrs");
/* Address allocation tests */
DO_TEST_DIFFERENT("addr-single-sata-disk");