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7006fe2f7f
- Fix 32-bit PTI for real. pti_clone_entry_text() is called twice, once
before initcalls so that initcalls can use the user-mode helper and
then again after text is set read only. Setting read only on 32-bit
might break up the PMD mapping, which makes the second invocation of
pti_clone_entry_text() find the mappings out of sync and failing.
Allow the second call to split the existing PMDs in the user mapping
and synchronize with the kernel mapping.
- Don't make acpi_mp_wake_mailbox not read only after init as the mail
box must be writable in the case that CPU hotplug operations happen
after boot. Otherwise the attempt to start a CPU crashes with a write
to read only memory.
- Add a missing sanity check in mtrr_save_state() to ensure that the
fixed MTRR MSRs are supported.
Otherwise mtrr_save_state() ends up in a #GP, which is fixed up, but
the WARN_ON() can bring systems down when panic on warn is set.
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Merge tag 'x86-urgent-2024-08-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Thomas Gleixner:
- Fix 32-bit PTI for real.
pti_clone_entry_text() is called twice, once before initcalls so that
initcalls can use the user-mode helper and then again after text is
set read only. Setting read only on 32-bit might break up the PMD
mapping, which makes the second invocation of pti_clone_entry_text()
find the mappings out of sync and failing.
Allow the second call to split the existing PMDs in the user mapping
and synchronize with the kernel mapping.
- Don't make acpi_mp_wake_mailbox read-only after init as the mail box
must be writable in the case that CPU hotplug operations happen after
boot. Otherwise the attempt to start a CPU crashes with a write to
read only memory.
- Add a missing sanity check in mtrr_save_state() to ensure that the
fixed MTRR MSRs are supported.
Otherwise mtrr_save_state() ends up in a #GP, which is fixed up, but
the WARN_ON() can bring systems down when panic on warn is set.
* tag 'x86-urgent-2024-08-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/mtrr: Check if fixed MTRRs exist before saving them
x86/paravirt: Fix incorrect virt spinlock setting on bare metal
x86/acpi: Remove __ro_after_init from acpi_mp_wake_mailbox
x86/mm: Fix PTI for i386 some more
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