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target-i386: Publish advised value of MSR_IA32_FEATURE_CONTROL via fw_cfg

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It's a prerequisite that certain bits of MSR_IA32_FEATURE_CONTROL should
be set before some features (e.g. VMX and LMCE) can be used, which is
usually done by the firmware. This patch adds a fw_cfg file
"etc/msr_feature_control" which contains the advised value of
MSR_IA32_FEATURE_CONTROL and can be used by guest firmware (e.g. SeaBIOS).

Backports commit 217f1b4a72153cf8d556e9d45919e9222c38d25e from qemu
This commit is contained in:
Haozhong Zhang 2018-02-25 02:49:35 -05:00 committed by Lioncash
parent b58f1fccce
commit 2893a1c381
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1 changed files with 4 additions and 0 deletions
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4
qemu/target-i386/cpu.h
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@ -330,6 +330,10 @@
#define MSR_TSC_ADJUST 0x0000003b
#define MSR_IA32_TSCDEADLINE 0x6e0
#define FEATURE_CONTROL_LOCKED (1<<0)
#define FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX (1<<2)
#define FEATURE_CONTROL_LMCE (1<<20)
#define MSR_P6_PERFCTR0 0xc1
#define MSR_IA32_SMBASE 0x9e