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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).

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Haozhong Zhang 2016-06-23 14:15:43 +08:00 • committed by Eduardo Habkost
parent 87f8b62604
commit 217f1b4a72
2 changed files with 33 additions and 0 deletions
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4
target-i386/cpu.h
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@ -332,6 +332,10 @@
#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