From 26606676d9d88c3f301fb8b3d39941ceff267af5 Mon Sep 17 00:00:00 2001 From: "plai@redhat.com" Date: Mon, 13 May 2019 16:27:20 +0200 Subject: 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 Rebase notes (4.0.0): - update to no compat format Signed-off-by: Danilo C. L. de Paula --- hw/i386/pc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 03497eed9a..91a4c5833a 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -360,6 +360,11 @@ GlobalProperty pc_rhel_compat[] = { .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", -- 2.20.1