Public bug reported:
[Impact]
Enable AMX (aka TMUL) new instructions on the 5.15 kernel.
[Test case]
Tests have been performed directly by Intel.
[Fix]
Apply the following upstream commits:
20df73756148 ("selftests/x86/amx: Update the ARCH_REQ_XCOMP_PERM test")
063452fd94d1 ("x86/fpu/xstate: Fix the ARCH_REQ_XCOMP_PERM implementation")
fa31a4d669bd ("x86/cpufeatures: Put the AMX macros in the word 18 block")
6c3118c32129 ("signal: Skip the altstack update when not needed")
52d0b8b18776 ("x86/fpu/signal: Initialize sw_bytes in save_xstate_epilog()")
d7a9590f608d ("Documentation/x86: Add documentation for using dynamic XSTATE
features")
101c669d165d ("selftests/x86/amx: Add context switch test")
6a3e0651b4a0 ("selftests/x86/amx: Add test cases for AMX state management")
2308ee57d93d ("x86/fpu/amx: Enable the AMX feature in 64-bit mode")
db3e7321b4b8 ("x86/fpu: Add XFD handling for dynamic states")
2ae996e0c1a3 ("x86/fpu: Calculate the default sizes independently")
eec2113eabd9 ("x86/fpu/amx: Define AMX state components and have it used for
boot-time checks")
70c3f1671b0c ("x86/fpu/xstate: Prepare XSAVE feature table for gaps in state
component numbers")
500afbf645a0 ("x86/fpu/xstate: Add fpstate_realloc()/free()")
783e87b40495 ("x86/fpu/xstate: Add XFD #NM handler")
672365477ae8 ("x86/fpu: Update XFD state where required")
5529acf47ec3 ("x86/fpu: Add sanity checks for XFD")
8bf26758ca96 ("x86/fpu: Add XFD state to fpstate")
dae1bd583896 ("x86/msr-index: Add MSRs for XFD")
c351101678ce ("x86/cpufeatures: Add eXtended Feature Disabling (XFD) feature
bit")
e61d6310a0f8 ("x86/fpu: Reset permission and fpstate on exec()")
9e798e9aa14c ("x86/fpu: Prepare fpu_clone() for dynamically enabled features")
53599b4d54b9 ("x86/fpu/signal: Prepare for variable sigframe length")
4b7ca609a33d ("x86/signal: Use fpu::__state_user_size for sigalt stack
validation")
23686ef25d4a ("x86/fpu: Add basic helpers for dynamically enabled features")
db8268df0983 ("x86/arch_prctl: Add controls for dynamic XSTATE components")
c33f0a81a2cf ("x86/fpu: Add fpu_state_config::legacy_features")
6f6a7c09c406 ("x86/fpu: Add members to struct fpu to cache permission
information")
84e4dccc8fce ("x86/fpu/xstate: Provide xstate_calculate_size()")
3aac3ebea08f ("x86/signal: Implement sigaltstack size validation")
1bdda24c4af6 ("signal: Add an optional check for altstack size")
582b01b6ab27 ("x86/fpu: Remove old KVM FPU interface")
d69c1382e1b7 ("x86/kvm: Convert FPU handling to a single swap buffer")
69f6ed1d14c6 ("x86/fpu: Provide infrastructure for KVM FPU cleanup")
75c52dad5e32 ("x86/fpu: Prepare for sanitizing KVM FPU code")
d72c87018d00 ("x86/fpu/xstate: Move remaining xfeature helpers to core")
eda32f4f93b4 ("x86/fpu: Rework restore_regs_from_fpstate()")
daddee247319 ("x86/fpu: Mop up xfeatures_mask_uabi()")
1c253ff2287f ("x86/fpu: Move xstate feature masks to fpu_*_cfg")
2bd264bce238 ("x86/fpu: Move xstate size to fpu_*_cfg")
cd9ae7617449 ("x86/fpu/xstate: Cleanup size calculations")
617473acdfe4 ("x86/fpu: Cleanup fpu__init_system_xstate_size_legacy()")
578971f4e228 ("x86/fpu: Provide struct fpu_config")
5509cc78080d ("x86/fpu/signal: Use fpstate for size and features")
49e4eb4125d5 ("x86/fpu/xstate: Use fpstate for copy_uabi_to_xstate()")
3ac8d75778fc ("x86/fpu: Use fpstate in __copy_xstate_to_uabi_buf()")
ad6ede407aae ("x86/fpu: Use fpstate in fpu_copy_kvm_uabi_to_fpstate()")
0b2d39aa0357 ("x86/fpu/xstate: Use fpstate for xsave_to_user_sigframe()")
073e627a4537 ("x86/fpu/xstate: Use fpstate for os_xsave()")
be31dfdfd75b ("x86/fpu: Use fpstate::size")
248452ce21ae ("x86/fpu: Add size and mask information to fpstate")
2dd8eedc80b1 ("x86/process: Move arch_thread_struct_whitelist() out of line")
f0cbc8b3cdf7 ("x86/fpu: Do not leak fpstate pointer on fork")
2f27b5034244 ("x86/fpu: Remove fpu::state")
63d6bdf36ce1 ("x86/math-emu: Convert to fpstate")
c20942ce5128 ("x86/fpu/core: Convert to fpstate")
7e049e8b7459 ("x86/fpu/signal: Convert to fpstate")
caee31a36c33 ("x86/fpu/regset: Convert to fpstate")
cceb496420fa ("x86/fpu: Convert tracing to fpstate")
1c57572d754f ("x86/KVM: Convert to fpstate")
087df48c298c ("x86/fpu: Replace KVMs xstate component clearing")
18b3fa1ad15f ("x86/fpu: Convert restore_fpregs_from_fpstate() to struct
fpstate")
f83ac56acdad ("x86/fpu: Convert fpstate_init() to struct fpstate")
87d0e5be0fac ("x86/fpu: Provide struct fpstate")
bf5d00470787 ("x86/fpu: Replace KVMs home brewed FPU copy to user")
079ec41b22b9 ("x86/fpu: Provide a proper function for ex_handler_fprestore()")
b56d2795b297 ("x86/fpu: Replace the includes of fpu/internal.h")
6415bb809263 ("x86/fpu: Mop up the internal.h leftovers")
ff0c37e191f2 ("x86/sev: Include fpu/xcr.h")
0ae67cc34f76 ("x86/fpu: Remove internal.h dependency from fpu/signal.h")
90489f1dee8b ("x86/fpu: Move fpstate functions to api.h")
d9d005f32aac ("x86/fpu: Move mxcsr related code to core")
9848fb96839b ("x86/fpu: Move fpregs_restore_userregs() to core")
cdcb6fa14e14 ("x86/fpu: Make WARN_ON_FPU() private")
34002571cb41 ("x86/fpu: Move legacy ASM wrappers to core")
df95b0f1aa56 ("x86/fpu: Move os_xsave() and os_xrstor() to core")
b579d0c3750e ("x86/fpu: Make os_xrstor_booting() private")
d06241f52cfe ("x86/fpu: Clean up CPU feature tests")
63e81807c1f9 ("x86/fpu: Move context switch and exit to user inlines into
sched.h")
9603445549da ("x86/fpu: Mark fpu__init_prepare_fx_sw_frame() as __init")
ca834defd33b ("x86/fpu: Rework copy_xstate_to_uabi_buf()")
ea4d6938d4c0 ("x86/fpu: Replace KVMs home brewed FPU copy from user")
a0ff0611c2fb ("x86/fpu: Move KVMs FPU swapping to FPU core")
63cf05a19a5d ("x86/fpu/xstate: Mark all init only functions __init")
ffd3e504c9e0 ("x86/fpu/xstate: Provide and use for_each_xfeature()")
126fe0401883 ("x86/fpu: Cleanup xstate xcomp_bv initialization")
509e7a30cd0a ("x86/fpu: Do not inherit FPU context for kernel and IO worker
threads")
2d16a1876f20 ("x86/process: Clone FPU in copy_thread()")
01f9f62d3ae7 ("x86/fpu: Remove pointless memset in fpu_clone()")
dc2f39fd1bf2 ("x86/fpu: Cleanup the on_boot_cpu clutter")
f5daf836f292 ("x86/fpu: Restrict xsaves()/xrstors() to independent states")
b50854eca0e0 ("x86/pkru: Remove useless include")
d2d926482cdf ("x86/fpu: Update stale comments")
9568bfb4f04b ("x86/fpu: Remove pointless argument from switch_fpu_finish()")
724fc0248d45 ("x86/fpu/signal: Fix missed conversion to correct boolean retval
in save_xstate_epilog()")
a2a8fd9a3efd ("x86/fpu/signal: Change return code of restore_fpregs_from_user()
to boolean")
be0040144152 ("x86/fpu/signal: Change return code of check_xstate_in_sigframe()
to boolean")
1193f408cd51 ("x86/fpu/signal: Change return type of __fpu_restore_sig() to
boolean")
f3305be5feec ("x86/fpu/signal: Change return type of fpu__restore_sig() to
boolean")
ee4ecdfbd289 ("x86/signal: Change return type of restore_sigcontext() to
boolean")
2af07f3a6e9f ("x86/fpu/signal: Change return type of copy_fpregs_to_sigframe()
helpers to boolean")
052adee66828 ("x86/fpu/signal: Change return type of copy_fpstate_to_sigframe()
to boolean")
fcfb7163329c ("x86/fpu/signal: Move xstate clearing out of
copy_fpregs_to_sigframe()")
4164a482a5d9 ("x86/fpu/signal: Move header zeroing out of
xsave_to_user_sigframe()")
4339d0c63c2d ("x86/fpu/signal: Clarify exception handling in
restore_fpregs_from_user()")
0c2e62ba04cd ("x86/extable: Remove EX_TYPE_FAULT from MCE safe fixups")
c6304556f3ae ("x86/fpu: Use EX_TYPE_FAULT_MCE_SAFE for exception fixups")
c1c97d175493 ("x86/copy_mc: Use EX_TYPE_DEFAULT_MCE_SAFE for exception fixups")
2cadf5248b93 ("x86/extable: Provide EX_TYPE_DEFAULT_MCE_SAFE and
EX_TYPE_FAULT_MCE_SAFE")
46d28947d987 ("x86/extable: Rework the exception table mechanics")
083b32d6f4fa ("x86/mce: Get rid of stray semicolons")
e42404afc4ca ("x86/mce: Deduplicate exception handling")
32fd8b59f91f ("x86/extable: Get rid of redundant macros")
326b567f82df ("x86/extable: Tidy up redundant handler functions")
[Regression potential]
The changes are limited to x86, mostly fpu code and signal handling, so
we may see regressions on x86, especially on FPU-intensive workloads.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1967750
Title:
Intel: enable x86 AMX
Status in linux package in Ubuntu:
New
Bug description:
[Impact]
Enable AMX (aka TMUL) new instructions on the 5.15 kernel.
[Test case]
Tests have been performed directly by Intel.
[Fix]
Apply the following upstream commits:
20df73756148 ("selftests/x86/amx: Update the ARCH_REQ_XCOMP_PERM test")
063452fd94d1 ("x86/fpu/xstate: Fix the ARCH_REQ_XCOMP_PERM implementation")
fa31a4d669bd ("x86/cpufeatures: Put the AMX macros in the word 18 block")
6c3118c32129 ("signal: Skip the altstack update when not needed")
52d0b8b18776 ("x86/fpu/signal: Initialize sw_bytes in save_xstate_epilog()")
d7a9590f608d ("Documentation/x86: Add documentation for using dynamic XSTATE
features")
101c669d165d ("selftests/x86/amx: Add context switch test")
6a3e0651b4a0 ("selftests/x86/amx: Add test cases for AMX state management")
2308ee57d93d ("x86/fpu/amx: Enable the AMX feature in 64-bit mode")
db3e7321b4b8 ("x86/fpu: Add XFD handling for dynamic states")
2ae996e0c1a3 ("x86/fpu: Calculate the default sizes independently")
eec2113eabd9 ("x86/fpu/amx: Define AMX state components and have it used for
boot-time checks")
70c3f1671b0c ("x86/fpu/xstate: Prepare XSAVE feature table for gaps in state
component numbers")
500afbf645a0 ("x86/fpu/xstate: Add fpstate_realloc()/free()")
783e87b40495 ("x86/fpu/xstate: Add XFD #NM handler")
672365477ae8 ("x86/fpu: Update XFD state where required")
5529acf47ec3 ("x86/fpu: Add sanity checks for XFD")
8bf26758ca96 ("x86/fpu: Add XFD state to fpstate")
dae1bd583896 ("x86/msr-index: Add MSRs for XFD")
c351101678ce ("x86/cpufeatures: Add eXtended Feature Disabling (XFD) feature
bit")
e61d6310a0f8 ("x86/fpu: Reset permission and fpstate on exec()")
9e798e9aa14c ("x86/fpu: Prepare fpu_clone() for dynamically enabled features")
53599b4d54b9 ("x86/fpu/signal: Prepare for variable sigframe length")
4b7ca609a33d ("x86/signal: Use fpu::__state_user_size for sigalt stack
validation")
23686ef25d4a ("x86/fpu: Add basic helpers for dynamically enabled features")
db8268df0983 ("x86/arch_prctl: Add controls for dynamic XSTATE components")
c33f0a81a2cf ("x86/fpu: Add fpu_state_config::legacy_features")
6f6a7c09c406 ("x86/fpu: Add members to struct fpu to cache permission
information")
84e4dccc8fce ("x86/fpu/xstate: Provide xstate_calculate_size()")
3aac3ebea08f ("x86/signal: Implement sigaltstack size validation")
1bdda24c4af6 ("signal: Add an optional check for altstack size")
582b01b6ab27 ("x86/fpu: Remove old KVM FPU interface")
d69c1382e1b7 ("x86/kvm: Convert FPU handling to a single swap buffer")
69f6ed1d14c6 ("x86/fpu: Provide infrastructure for KVM FPU cleanup")
75c52dad5e32 ("x86/fpu: Prepare for sanitizing KVM FPU code")
d72c87018d00 ("x86/fpu/xstate: Move remaining xfeature helpers to core")
eda32f4f93b4 ("x86/fpu: Rework restore_regs_from_fpstate()")
daddee247319 ("x86/fpu: Mop up xfeatures_mask_uabi()")
1c253ff2287f ("x86/fpu: Move xstate feature masks to fpu_*_cfg")
2bd264bce238 ("x86/fpu: Move xstate size to fpu_*_cfg")
cd9ae7617449 ("x86/fpu/xstate: Cleanup size calculations")
617473acdfe4 ("x86/fpu: Cleanup fpu__init_system_xstate_size_legacy()")
578971f4e228 ("x86/fpu: Provide struct fpu_config")
5509cc78080d ("x86/fpu/signal: Use fpstate for size and features")
49e4eb4125d5 ("x86/fpu/xstate: Use fpstate for copy_uabi_to_xstate()")
3ac8d75778fc ("x86/fpu: Use fpstate in __copy_xstate_to_uabi_buf()")
ad6ede407aae ("x86/fpu: Use fpstate in fpu_copy_kvm_uabi_to_fpstate()")
0b2d39aa0357 ("x86/fpu/xstate: Use fpstate for xsave_to_user_sigframe()")
073e627a4537 ("x86/fpu/xstate: Use fpstate for os_xsave()")
be31dfdfd75b ("x86/fpu: Use fpstate::size")
248452ce21ae ("x86/fpu: Add size and mask information to fpstate")
2dd8eedc80b1 ("x86/process: Move arch_thread_struct_whitelist() out of line")
f0cbc8b3cdf7 ("x86/fpu: Do not leak fpstate pointer on fork")
2f27b5034244 ("x86/fpu: Remove fpu::state")
63d6bdf36ce1 ("x86/math-emu: Convert to fpstate")
c20942ce5128 ("x86/fpu/core: Convert to fpstate")
7e049e8b7459 ("x86/fpu/signal: Convert to fpstate")
caee31a36c33 ("x86/fpu/regset: Convert to fpstate")
cceb496420fa ("x86/fpu: Convert tracing to fpstate")
1c57572d754f ("x86/KVM: Convert to fpstate")
087df48c298c ("x86/fpu: Replace KVMs xstate component clearing")
18b3fa1ad15f ("x86/fpu: Convert restore_fpregs_from_fpstate() to struct
fpstate")
f83ac56acdad ("x86/fpu: Convert fpstate_init() to struct fpstate")
87d0e5be0fac ("x86/fpu: Provide struct fpstate")
bf5d00470787 ("x86/fpu: Replace KVMs home brewed FPU copy to user")
079ec41b22b9 ("x86/fpu: Provide a proper function for ex_handler_fprestore()")
b56d2795b297 ("x86/fpu: Replace the includes of fpu/internal.h")
6415bb809263 ("x86/fpu: Mop up the internal.h leftovers")
ff0c37e191f2 ("x86/sev: Include fpu/xcr.h")
0ae67cc34f76 ("x86/fpu: Remove internal.h dependency from fpu/signal.h")
90489f1dee8b ("x86/fpu: Move fpstate functions to api.h")
d9d005f32aac ("x86/fpu: Move mxcsr related code to core")
9848fb96839b ("x86/fpu: Move fpregs_restore_userregs() to core")
cdcb6fa14e14 ("x86/fpu: Make WARN_ON_FPU() private")
34002571cb41 ("x86/fpu: Move legacy ASM wrappers to core")
df95b0f1aa56 ("x86/fpu: Move os_xsave() and os_xrstor() to core")
b579d0c3750e ("x86/fpu: Make os_xrstor_booting() private")
d06241f52cfe ("x86/fpu: Clean up CPU feature tests")
63e81807c1f9 ("x86/fpu: Move context switch and exit to user inlines into
sched.h")
9603445549da ("x86/fpu: Mark fpu__init_prepare_fx_sw_frame() as __init")
ca834defd33b ("x86/fpu: Rework copy_xstate_to_uabi_buf()")
ea4d6938d4c0 ("x86/fpu: Replace KVMs home brewed FPU copy from user")
a0ff0611c2fb ("x86/fpu: Move KVMs FPU swapping to FPU core")
63cf05a19a5d ("x86/fpu/xstate: Mark all init only functions __init")
ffd3e504c9e0 ("x86/fpu/xstate: Provide and use for_each_xfeature()")
126fe0401883 ("x86/fpu: Cleanup xstate xcomp_bv initialization")
509e7a30cd0a ("x86/fpu: Do not inherit FPU context for kernel and IO worker
threads")
2d16a1876f20 ("x86/process: Clone FPU in copy_thread()")
01f9f62d3ae7 ("x86/fpu: Remove pointless memset in fpu_clone()")
dc2f39fd1bf2 ("x86/fpu: Cleanup the on_boot_cpu clutter")
f5daf836f292 ("x86/fpu: Restrict xsaves()/xrstors() to independent states")
b50854eca0e0 ("x86/pkru: Remove useless include")
d2d926482cdf ("x86/fpu: Update stale comments")
9568bfb4f04b ("x86/fpu: Remove pointless argument from switch_fpu_finish()")
724fc0248d45 ("x86/fpu/signal: Fix missed conversion to correct boolean
retval in save_xstate_epilog()")
a2a8fd9a3efd ("x86/fpu/signal: Change return code of
restore_fpregs_from_user() to boolean")
be0040144152 ("x86/fpu/signal: Change return code of
check_xstate_in_sigframe() to boolean")
1193f408cd51 ("x86/fpu/signal: Change return type of __fpu_restore_sig() to
boolean")
f3305be5feec ("x86/fpu/signal: Change return type of fpu__restore_sig() to
boolean")
ee4ecdfbd289 ("x86/signal: Change return type of restore_sigcontext() to
boolean")
2af07f3a6e9f ("x86/fpu/signal: Change return type of
copy_fpregs_to_sigframe() helpers to boolean")
052adee66828 ("x86/fpu/signal: Change return type of
copy_fpstate_to_sigframe() to boolean")
fcfb7163329c ("x86/fpu/signal: Move xstate clearing out of
copy_fpregs_to_sigframe()")
4164a482a5d9 ("x86/fpu/signal: Move header zeroing out of
xsave_to_user_sigframe()")
4339d0c63c2d ("x86/fpu/signal: Clarify exception handling in
restore_fpregs_from_user()")
0c2e62ba04cd ("x86/extable: Remove EX_TYPE_FAULT from MCE safe fixups")
c6304556f3ae ("x86/fpu: Use EX_TYPE_FAULT_MCE_SAFE for exception fixups")
c1c97d175493 ("x86/copy_mc: Use EX_TYPE_DEFAULT_MCE_SAFE for exception
fixups")
2cadf5248b93 ("x86/extable: Provide EX_TYPE_DEFAULT_MCE_SAFE and
EX_TYPE_FAULT_MCE_SAFE")
46d28947d987 ("x86/extable: Rework the exception table mechanics")
083b32d6f4fa ("x86/mce: Get rid of stray semicolons")
e42404afc4ca ("x86/mce: Deduplicate exception handling")
32fd8b59f91f ("x86/extable: Get rid of redundant macros")
326b567f82df ("x86/extable: Tidy up redundant handler functions")
[Regression potential]
The changes are limited to x86, mostly fpu code and signal handling,
so we may see regressions on x86, especially on FPU-intensive
workloads.
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