xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

x86/bugs: Keep a per-CPU IA32_SPEC_CTRL value

Browse Source 
commit caa0ff24d5d0e02abce5e65c3d2b7f20a6617be5 upstream.

Due to TIF_SSBD and TIF_SPEC_IB the actual IA32_SPEC_CTRL value can
differ from x86_spec_ctrl_base. As such, keep a per-CPU value
reflecting the current task's MSR content.

  [jpoimboe: rename]

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Zijlstra
2022-06-14 23:15:52 +02:00
committed by Greg Kroah-Hartman
parent a989e75136
commit 9e727e0d94
3 changed files with 25 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/kernel/process.c
View File

@@ -556,7 +556,7 @@ static __always_inline void __speculation_ctrl_update(unsigned long tifp,
}
if (updmsr)
wrmsrl(MSR_IA32_SPEC_CTRL, msr);
write_spec_ctrl_current(msr);
}
static unsigned long speculation_ctrl_update_tif(struct task_struct *tsk)