If the CPU doesn't support GUEST_MAXPHYADDR < HOST_MAXPHYADDR we
let QEMU choose to use the host MAXPHYADDR and print a warning to the
user.
Signed-off-by: Mohammed Gamal <mgamal@xxxxxxxxxx>
---
target/i386/cpu.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index b1b311baa2..91c57117ce 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -6589,6 +6589,17 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
uint32_t host_phys_bits = x86_host_phys_bits();
static bool warned;
+ /*
+ * If host doesn't support setting physical bits on the guest,
+ * report it and return
+ */
+ if (cpu->phys_bits < host_phys_bits &&
+ !kvm_has_smaller_maxphyaddr()) {
+ warn_report("Host doesn't support setting smaller phys-bits."
+ " Using host phys-bits\n");
+ cpu->phys_bits = host_phys_bits;
+ }
+
/* Print a warning if the user set it to a value that's not the
* host value.
*/
--
2.26.2
