I just realized that from my previous comment I said: (2)
There is *no current request* to allow following features to be reported by EAX_7H_ECX_0_EDX QEMU/KVM right now: * CPUID.(EAX=7H,ECX=0):EDX[27] STIBP support flag. * CPUID.(EAX=7H,ECX=0):EDX[28] L1D_FLUSH support flag. * CPUID.(EAX=7H,ECX=0):EDX[31] SSBD support flag. But the other bug: https://bugs.launchpad.net/intel/+bug/1830821 Is about enabling SSBD support: CPUID.(EAX=7H,ECX=0):EDX[29] (IA32_ARCH_CAPABILITIES feature flag) ... - (bit 4) SSB_NO: processor not susceptible to spec store bypass and to enable guest to opt out from SSB (speculative store bypass) ** Changed in: qemu (Ubuntu) Status: Triaged => Confirmed ** Changed in: linux (Ubuntu) Importance: Undecided => Wishlist ** Changed in: qemu (Ubuntu) Assignee: (unassigned) => Rafael David Tinoco (rafaeldtinoco) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1828495 Title: [KVM][CLX] CPUID_7_0_EDX_ARCH_CAPABILITIES is not enabled in VM. Status in intel: New Status in linux package in Ubuntu: Confirmed Status in qemu package in Ubuntu: Confirmed Bug description: This is a bug. Test Environment: Repro Steps: 1. Boot up guest using: -cpu Cascadelake-Server [root@clx-2s2 yexin]# qemu-system-x86_64 -accel kvm -drive if=virtio,id=hd,file=/home/x/x,format=qcow2 -m 4096 -smp 4 -cpu Cascadelake-Server -serial stdio char device redirected to /dev/pts/3 (label serial0) qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX [bit 4] qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX [bit 4] qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX [bit 4] qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX [bit 4] 2. To check CPU ID related to features[FEAT_7_0_EDX] ：CPUID_7_0_EDX_ARCH_CAPABILITIES Expected Result: Both host and guest's CPUID.07H EDX bit 29 should be 1. Actual Result: Host's cpuid: 0x00000007 0x00: eax=0x00000000 ebx=0xd39ffffb ecx=0x00000818 edx=0xbc000000 (EDX bit 29=1) Guest's cpuid : 0x00000007 0x00: eax=0x00000000 ebx=0xd19f0fb9 ecx=0x00000818 edx=0x84000000 (EDX bit 29=0) Commit:2bdb76c015df7125783d8394d6339d181cb5bc30 Target Kerned: 5.1 Target Release: 19.10 To manage notifications about this bug go to: https://bugs.launchpad.net/intel/+bug/1828495/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
