[linux-6.6/devel] x86: Add support for Zhaoxin PAUSEOPT instruction · Pull Request !669 · OpenCloudOS/OpenCloudOS-Kernel

Include:
1. KVM: x86: Introduce support for Zhaoxin PAUSEOPT instruction
2. x86/delay: add support for Zhaoxin PAUSEOPT instruction
3. Revert the HOST and KVM ZXPAUSE patches

-------------------

This series introduces support for the Zhaoxin PAUSEOPT instruction, which
replaces the previous ZXPAUSE implementation. The changes include:

1. Revert old ZXPAUSE patches (Patch 1/3)
   - Removes the previous zxpause implementation to prepare for the new
     PAUSEOPT support

2. Add PAUSEOPT support in x86/delay (Patch 2/3)
   - Adds the new PAUSEOPT instruction support with CPU feature detection
   - Implements delay functions using PAUSEOPT
   - Adds necessary MSR registers for pause control

3. Add KVM support for PAUSEOPT (Patch 3/3)
   - Adds VMX support for PAUSEOPT instruction in guests
   - Handles PAUSEOPT VM exits properly
   - Adds required VMCS fields and tertiary controls

PAUSEOPT is a Zhaoxin-specific instruction similar to Intel's TPAUSE, allowing
the processor to enter an optimized power/performance state. Unlike TPAUSE,
PAUSEOPT uses delta TSC and only supports C0.1 state.

Impact:
- Affects only Zhaoxin processors with PAUSEOPT support
- No impact on other x86 vendors
- KVM support enables guests to use PAUSEOPT on supported Zhaoxin hosts

类型	指派人员	状态
审查	chinaljp030 刘诗	已完成 (0/0人)
测试	chinaljp030 刘诗	已完成 (0/0人)

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