id = 2037
title = "CPUID.07H:EBX.intel-pt not supported warning info shown in terminal when start guest with -cpu qemu64,+intel-pt"
state = "opened"
created_at = "2023-12-14T06:43:06.232Z"
closed_at = "n/a"
labels = ["accel: KVM", "target: i386"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/2037"
host-os = "CentOS stream 9"
host-arch = "x86"
qemu-version = "8.1.92"
guest-os = "CentOS stream 9"
guest-arch = "x86"
description = """When launch guest with qemu-system-x86_64 with parameter -cpu host,+intel-pt, it will show warning info in terminal :
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EBX.intel-pt [bit 25] 'intel_pt' can not be found  in guest's CPU flag. 
While host already support intel_pt."""
reproduce = """1. Run the above QEMU command."""
additional = """This issue was observed with kernel 5.13

qemu-system-x86_64 -accel kvm -m 4096 -smp 4 -cpu host,+intel-pt,min-level=0x14
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EBX.intel-pt [bit 25]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EBX.intel-pt [bit 25]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EBX.intel-pt [bit 25]
qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:EBX.intel-pt [bit 25]"""