Due to the fact that Intel-PT virtualization support has been broken in QEMU since Sapphire Rapids generation[1], below warning is triggered when luanching TD guest: warning: host doesn't support requested feature: CPUID.07H:EBX.intel-pt [bit 25] Before Intel-pt is fixed in QEMU, just make Intel-PT unsupported for TD guest, to avoid the confusing warning. [1] https://lore.kernel.org/qemu-devel/20230531084311.3807277-1-xiaoyao.li@xxxxxxxxx/ Signed-off-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx> --- Changes in v4: - newly added patch; --- target/i386/kvm/tdx.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c index a962f8a4ea60..2703e97f991d 100644 --- a/target/i386/kvm/tdx.c +++ b/target/i386/kvm/tdx.c @@ -292,6 +292,11 @@ void tdx_get_supported_cpuid(uint32_t function, uint32_t index, int reg, if (function == 1 && reg == R_ECX && !enable_cpu_pm) { *ret &= ~CPUID_EXT_MONITOR; } + + /* QEMU Intel-pt support is broken, don't advertise Intel-PT */ + if (function == 7 && reg == R_EBX) { + *ret &= ~CPUID_7_0_EBX_INTEL_PT; + } } enum tdx_ioctl_level{ -- 2.34.1
