### Summary of changes EwanHai (4): target/i386: Add support for Zhaoxin CPU vendor identification target/i386: Add CPUID leaf 0xC000_0001 EDX definitions target/i386: Introduce Zhaoxin Yongfeng CPU model target/i386: Update CMPLegacy handling for Zhaoxin CPUs
target/i386/cpu.c | 128 ++++++++++++++++++++++++++++++++++++++++++++-- target/i386/cpu.h | 41 ++++++++++++++- 2 files changed, 165 insertions(+), 4 deletions(-) ### Changes since v1 1. Removed VIA-related information from the patch description to avoid misunderstanding. 2. Replaced CPUID_VENDOR_VIA with CPUID_VENDOR_ZHAOXIN1 because the "Centaurhauls" vendor ID now belongs to Zhaoxin.The previous CPUID_VENDOR_VIA macro was only defined but never used in QEMU, making this change straightforward. v1 link: https://lore.kernel.org/qemu-devel/20240625091905.1325205-1-ewanhai- o...@zhaoxin.com/ ### Known Issues 1. Issue with VMX Preemption Timer Rate on Yongfeng CPU: - Description: On Yongfeng CPUs, the VMX preemption timer rate is 128, meaning that bits 4:0 of MSR_IA32_VMX_MISC_CTLS should be set to 7. However, due to Intel's rate being 5, the Linux kernel has hardcoded this value as 5: `#define VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE 5`. - Impact: This discrepancy can cause incorrect behavior in the VMX preemption timer on Yongfeng CPUs. - Workaround: A patch to correct this issue in the Linux kernel is currently being prepared and will be submitted soon. -- 2.34.1
