2008年1月8日 · Note: once "x2APIC mode" is enabled it can't be disabled by software, and if there's more than 255 CPUs the BIOS is meant to enable x2APIC mode before the OS boots. This means that any OS that doesn't support x2APIC will be useless for high-end servers in about 5 years, so most OSs will support x2APIC before then, and Intel will probably be ...

2019年6月23日 · QEMU virtualizes x2APIC mode when using KVM (-enable-kvm option). I think, your host CPU has to support x2APIC (which is about guaranteed these days) for this to work. But beware. GDB stub is not very reliable when using KVM.

2008年11月25日 · Intel x2APIC spec wrote: 2.4.2 Logical Destination Register To enable cluster ID assignment in a fashion that matches the system topology characteristics and to enable efficient routing of logical mode lowest priority device interrupts

2021年11月12日 · I'm now working on the initializing code of x2apic, but my qemu gives me this warning: qemu-system-x86_64: warning: TCG doesn't support requested feature: CPUID.01H:ECX.x2apic [bit 21] When I want to check whether my emulator supports x2apic or not. My work platform is on a virtual machine, so it does not support KVM.

2016年10月13日 · I've checked qemu's source, and I've found a stupid patch that silently disables x2apic when irqchip is not used, so I've tried Code: Select all qemu-system-x86_64 -m 32 -d guest_errors -hda bin/disk.dd -enable-kvm -machine kernel-irqchip=off -cpu host,+x2apic -monitor stdio QEMU 2.8.50 monitor - type 'help' for more information (qemu) warning ...

2008年11月9日 · The Processor X2APIC structure (type 9) is very similar to the processor local APIC structure (type 0). When using the X2APIC interrupt model, logical processors with APIC ID values of 255 and greater in the system are required to have a Processor X2APIC record and an ACPI Device object .

2007年10月15日 · johnsa wrote:My local apic code supports both xapic and x2apic mode. All my emulators only run xapic mode while my real machines run x2apic. If I leave the init in xapic all runs as planned, the second I switch to x2apic mode (and on real h/w) configuring the lint0 and lint1 in any way seem to cause a GPF.

2019年6月23日 · - furthermore, for x2apic: here and here for example. - and for tsc-deadline msr here. But kvm emulation also works for all of these, so if the OP can do kvm, they definitely should. Just for the records, x2apic and tsc-deadline works since SandyBridge, it's only fma and pcid that requires Haswell.

2013年12月18日 · I compiled from source code v2.6 under that 'x2apic' is included by default，and i use the default pre-defined cpu: cpu: model = core2_penryn_t9600 ... The problem is that x2apic is not supported, i have tried other cpu parameters-----# corei5_lynnfield_750 Intel(R) Core(TM) i5 750 (Lynnfield)

2022年7月22日 · I added experimental support for long mode (proudly supporting 4GB linear and 4GB physical address space) as it seems odd that 32bit Linux doesn't enable x2apic on this machine. But again it didn't seem to change anything and both backlight adjusting SMI and _BCM still have a high chance of sending core 0 into the ISR bit set but interrupt ...