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hv: passthru TSC_ADJUST to VM with lapic pt

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Linux access TSC_ADJUST to verify it has not tampered every time when enter idle.
So for RTVM running rt-linux, the access will cause vm exit which affect real-time performance.

This commit pass through TSC_ADJUST to VM with lapic_pt, to avoid TSC_ADJUST caused vm_exit.
For other VMs, TSC_ADJUST msr access is still trapped and emulated.

Tracked-On: #2813
Signed-off-by: Yan, Like <like.yan@intel.com>
This commit is contained in:
Yan, Like 2019-03-18 16:04:00 +08:00 committed by wenlingz
parent f32b59d73d
commit 93ed2af165
1 changed files with 1 additions and 0 deletions
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hypervisor/arch/x86/guest/vmsr.c
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@ -661,4 +661,5 @@ void update_msr_bitmap_x2apic_passthru(const struct acrn_vcpu *vcpu)
enable_msr_interception(msr_bitmap, MSR_IA32_EXT_APIC_LDR, INTERCEPT_READ); enable_msr_interception(msr_bitmap, MSR_IA32_EXT_APIC_LDR, INTERCEPT_READ);
enable_msr_interception(msr_bitmap, MSR_IA32_EXT_APIC_ICR, INTERCEPT_WRITE); enable_msr_interception(msr_bitmap, MSR_IA32_EXT_APIC_ICR, INTERCEPT_WRITE);
enable_msr_interception(msr_bitmap, MSR_IA32_TSC_DEADLINE, INTERCEPT_DISABLE); enable_msr_interception(msr_bitmap, MSR_IA32_TSC_DEADLINE, INTERCEPT_DISABLE);
enable_msr_interception(msr_bitmap, MSR_IA32_TSC_ADJUST, INTERCEPT_DISABLE);
} }