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c2283743f0
Linux commit edfe63ec97ed ("x86/mtrr: Fix Xorg crashes in Qemu sessions")
disables PAT feature if MTRR is not enabled. This patch does partial
emulation of MTRR to prevent this from happening: enable fixed-range
MTRRs and disable virable range MTRRs
By default IA32_PAT MSR (SDM Vol3 11.12.4, Table 11-12) doesn't include
'WC' type. If MTRR is disabled from the guests, Linux doesn't allow
writing IA32_PAT MSR so WC type can't be enabled. This creates some
performance issues for certian applications that rely on WC memory type.
Implementation summary:
- Enable MTRR feature: MTRRdefType.E=1
- Enable fixed range MTRRs: MTRRCAP.fix=1, MTRRdefType.FE=1
- For simplicity, disable variable range MTRRs: MTRRCAP.vcnt=0.
It's expected that this bit is honored by the guests and they won't
change the guest memory type through variable MTRRs.
Signed-off-by: bliu11 <baohong.liu@intel.com>
Signed-off-by: Zide Chen <zide.chen@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
40 lines
678 B
C
40 lines
678 B
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef HV_ARCH_H
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#define HV_ARCH_H
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#include <cpu.h>
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#include <gdt.h>
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#include <idt.h>
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#include <apicreg.h>
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#include <ioapic.h>
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#include <lapic.h>
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#include <msr.h>
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#include <io.h>
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#include <mtrr.h>
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#include <vcpu.h>
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#include <trusty.h>
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#include <pm.h>
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#include <vm.h>
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#include <cpuid.h>
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#include <mmu.h>
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#include <irq.h>
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#include <timer.h>
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#include <softirq.h>
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#include <vmx.h>
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#include <assign.h>
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#include <vtd.h>
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#include <vpic.h>
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#include <vlapic.h>
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#include <vioapic.h>
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#include <guest.h>
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#include <vmexit.h>
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#include <cpufeatures.h>
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#endif /* HV_ARCH_H */
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