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cppc init failure after guest reboot #8695

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yison opened this issue Aug 14, 2024 · 1 comment
Open

cppc init failure after guest reboot #8695

yison opened this issue Aug 14, 2024 · 1 comment
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status: new The issue status: new for creation

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@yison
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yison commented Aug 14, 2024

at first guest boot, cppc can init successfully.
But cppc failed to init after guest reboot.
@yison yison added the status: new The issue status: new for creation label Aug 14, 2024
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yison commented Aug 14, 2024

[External_System_ID] ACRN-10970

yison added a commit to yison/acrn-hypervisor that referenced this issue Aug 14, 2024
@yison
hv: hypercall: change condition for hcall_get_cpu_pm_state
44dd7b4 
After rebooting guest, CPPC initialization failed because _CST and _CPC
missed in DSDT table. When writing _CST and _CPC in DSDT table, it gets
cx_cnt or px_cnt as condition. Getting cx_cnt or px_cnt triggers
the hypercall hcall_get_cpu_pm_state. The hypercall hcall_get_cpu_pm_state
uses VM_CREATED as VM state's condition. While, after rebooting guest,
the VM state is VM_PAUSED when writing _CST and _CPC in DSDT table.
Therefore, changing VM state's condition from VM_CREATED to VM_CREATED or
VM_PAUSED for hcall_get_cpu_pm_state can solve the CPPC initialization
failed issue after rebooting guest.

Tracked-On: projectacrn#8695
Signed-off-by: Yuan Lu <yuan.y.lu@intel.com>
Reviewed-by: Fei Li <fei1.li@intel.com>
@yison yison mentioned this issue Aug 14, 2024
Merged
acrnsi-robot pushed a commit that referenced this issue Aug 16, 2024
@yison @acrnsi-robot
hv: hypercall: change condition for hcall_get_cpu_pm_state
95bfc87 
After rebooting guest, CPPC initialization failed because _CST and _CPC
missed in DSDT table. When writing _CST and _CPC in DSDT table, it gets
cx_cnt or px_cnt as condition. Getting cx_cnt or px_cnt triggers
the hypercall hcall_get_cpu_pm_state. The hypercall hcall_get_cpu_pm_state
uses VM_CREATED as VM state's condition. While, after rebooting guest,
the VM state is VM_PAUSED when writing _CST and _CPC in DSDT table.
Therefore, changing VM state's condition from VM_CREATED to VM_CREATED or
VM_PAUSED for hcall_get_cpu_pm_state can solve the CPPC initialization
failed issue after rebooting guest.

Tracked-On: #8695
Signed-off-by: Yuan Lu <yuan.y.lu@intel.com>
Reviewed-by: Fei Li <fei1.li@intel.com>
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