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From 01a2ecb4c38fe4a35455ea706e76984ee8d5a769 Mon Sep 17 00:00:00 2001
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From: Eduardo Habkost <ehabkost@redhat.com>
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Date: Thu, 13 Dec 2018 15:52:00 +0000
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Subject: [PATCH 2/5] rhel: Set host-phys-bits-limit=48 on rhel machine-types
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RH-Author: Eduardo Habkost <ehabkost@redhat.com>
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Message-id: <20181213155200.20300-3-ehabkost@redhat.com>
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Patchwork-id: 83480
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O-Subject: [RHEL8/rhel qemu-kvm PATCH 2/2] rhel: Set host-phys-bits-limit=48 on rhel machine-types
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Bugzilla: 1598284
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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RH-Acked-by: Pankaj Gupta <pagupta@redhat.com>
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RH-Acked-by: Bandan Das <bsd@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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Upstream status: not applicable
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Currently we use the host physical address size by default on
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VMs. This was a good default on most cases, but this is not the
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case on host CPUs supporting 5-level EPT. On those cases, we
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want VMs to use 4-level EPT by default.
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Ensure VMs will use 4-level EPT by default, by limiting physical
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address bits to 48.
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Not applicable upstream because upstream doesn't set
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host-phys-bits=on by default.
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Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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include/hw/i386/pc.h | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
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index 285e8df..c29176d 100644
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--- a/include/hw/i386/pc.h
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+++ b/include/hw/i386/pc.h
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@@ -963,6 +963,11 @@ extern void igd_passthrough_isa_bridge_create(PCIBus *bus, uint16_t gpu_dev_id);
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.property = "host-phys-bits",\
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.value = "on",\
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},\
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+ { /* PC_RHEL_COMPAT */ \
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+ .driver = TYPE_X86_CPU,\
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+ .property = "host-phys-bits-limit",\
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+ .value = "48",\
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+ },\
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{ /* PC_RHEL_COMPAT bz 1508330 */ \
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.driver = "vfio-pci",\
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.property = "x-no-geforce-quirks",\
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--
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1.8.3.1
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