From e204c887357f2d2ee1df5436a7d7f68b227c4b64 Mon Sep 17 00:00:00 2001 From: "plai@redhat.com" Date: Fri, 22 Mar 2019 17:45:15 +0000 Subject: [PATCH 2/2] rhel: Set host-phys-bits-limit=48 on rhel machine-types RH-Author: plai@redhat.com Message-id: <1553276715-26278-3-git-send-email-plai@redhat.com> Patchwork-id: 85126 O-Subject: [RHEL8.0 qemu-kvm PATCH 2/2] rhel: Set host-phys-bits-limit=48 on rhel machine-types Bugzilla: 1688915 RH-Acked-by: Dr. David Alan Gilbert RH-Acked-by: Eduardo Habkost RH-Acked-by: Michael S. Tsirkin From: Eduardo Habkost Upstream status: not applicable Currently we use the host physical address size by default on VMs. This was a good default on most cases, but this is not the case on host CPUs supporting 5-level EPT. On those cases, we want VMs to use 4-level EPT by default. Ensure VMs will use 4-level EPT by default, by limiting physical address bits to 48. Not applicable upstream because upstream doesn't set host-phys-bits=on by default. Signed-off-by: Eduardo Habkost Signed-off-by: Danilo C. L. de Paula (cherry picked from commit 01a2ecb4c38fe4a35455ea706e76984ee8d5a769) Signed-off-by: Paul Lai Signed-off-by: Danilo C. L. de Paula --- include/hw/i386/pc.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h index 782d728..de25407 100644 --- a/include/hw/i386/pc.h +++ b/include/hw/i386/pc.h @@ -992,6 +992,11 @@ extern void igd_passthrough_isa_bridge_create(PCIBus *bus, uint16_t gpu_dev_id); .property = "host-phys-bits",\ .value = "on",\ },\ + { /* PC_RHEL_COMPAT */ \ + .driver = TYPE_X86_CPU,\ + .property = "host-phys-bits-limit",\ + .value = "48",\ + },\ { /* PC_RHEL_COMPAT bz 1508330 */ \ .driver = "vfio-pci",\ .property = "x-no-geforce-quirks",\ -- 1.8.3.1