Messages in this thread | | | Date | Mon, 28 Mar 2022 05:39:02 -0700 | Subject | Re: [patch 0/7] x86/fpu: Cure supervisor mode (ENQCMD) fallout | From | "Chang S. Bae" <> |
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On 3/24/2022 6:47 AM, Thomas Gleixner wrote: > > It builds, boots on host and guest, but is not yet extensively tested. > Testing with a AMX + PASID enabled machine has not been done at all as I > don't have easy access to such a beast.
The AMX tests [1][2] went well on both host and guest. Also dmesg logs look to be okay:
On host,
$ sudo dmesg | grep fpu [ 0.000000] x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x020: 'AVX-512 opmask' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x040: 'AVX-512 Hi256' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x080: 'AVX-512 ZMM_Hi256' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x200: 'Protection Keys User registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x400: 'PASID state' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x20000: 'AMX Tile config' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x40000: 'AMX Tile data' [ 0.000000] x86/fpu: xstate_offset[2]: 576, xstate_sizes[2]: 256 [ 0.000000] x86/fpu: xstate_offset[5]: 832, xstate_sizes[5]: 64 [ 0.000000] x86/fpu: xstate_offset[6]: 896, xstate_sizes[6]: 512 [ 0.000000] x86/fpu: xstate_offset[7]: 1408, xstate_sizes[7]: 1024 [ 0.000000] x86/fpu: xstate_offset[9]: 2432, xstate_sizes[9]: 8 [ 0.000000] x86/fpu: xstate_offset[10]: 2440, xstate_sizes[10]: 8 [ 0.000000] x86/fpu: xstate_offset[17]: 2496, xstate_sizes[17]: 64 [ 0.000000] x86/fpu: xstate_offset[18]: 2560, xstate_sizes[18]: 8192 [ 0.000000] x86/fpu: Enabled xstate features 0x606e7, context size is 10752 bytes, using 'compacted' format.
On guest, (AMX is available with the upstream Qemu [3].)
$ sudo dmesg | grep fpu ... [ 0.000000] x86/fpu: Supporting XSAVE feature 0x200: 'Protection Keys User registers' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x20000: 'AMX Tile config' [ 0.000000] x86/fpu: Supporting XSAVE feature 0x40000: 'AMX Tile data' ... [ 0.000000] x86/fpu: xstate_offset[9]: 2432, xstate_sizes[9]: 8 [ 0.000000] x86/fpu: xstate_offset[17]: 2496, xstate_sizes[17]: 64 [ 0.000000] x86/fpu: xstate_offset[18]: 2560, xstate_sizes[18]: 8192 [ 0.000000] x86/fpu: Enabled xstate features 0x602e7, context size is 10752 bytes, using 'compacted' format.
Thanks, Chang
[1] https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/tree/tools/testing/selftests/x86/amx.c?h=x86/fpu [2] https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git/tree/tools/testing/selftests/kvm/x86_64/amx_test.c?h=x86/fpu [3] https://git.qemu.org/?p=qemu.git;a=commit;h=3d31fe4d662f13c70eb7e87f29513623ccd76322
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