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| author | Paolo Bonzini <pbonzini@redhat.com> | 2024-02-01 02:09:01 +0300 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2024-02-26 19:16:15 +0300 |
| commit | 9a458198eba98b7207669a166e64d04b04cb651b (patch) | |
| tree | a574aa3c85eb923df636bd96dc6f4b857624cee3 /include/linux/fpga/fpga-mgr.h | |
| parent | 43fb862de8f628c5db5e96831c915b9aebf62d33 (diff) | |
| download | linux-9a458198eba98b7207669a166e64d04b04cb651b.tar.xz | |
x86/cpu: Allow reducing x86_phys_bits during early_identify_cpu()
In commit fbf6449f84bf ("x86/sev-es: Set x86_virt_bits to the correct
value straight away, instead of a two-phase approach"), the initialization
of c->x86_phys_bits was moved after this_cpu->c_early_init(c). This is
incorrect because early_init_amd() expected to be able to reduce the
value according to the contents of CPUID leaf 0x8000001f.
Fortunately, the bug was negated by init_amd()'s call to early_init_amd(),
which does reduce x86_phys_bits in the end. However, this is very
late in the boot process and, most notably, the wrong value is used for
x86_phys_bits when setting up MTRRs.
To fix this, call get_cpu_address_sizes() as soon as X86_FEATURE_CPUID is
set/cleared, and c->extended_cpuid_level is retrieved.
Fixes: fbf6449f84bf ("x86/sev-es: Set x86_virt_bits to the correct value straight away, instead of a two-phase approach")
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Cc:stable@vger.kernel.org
Link: https://lore.kernel.org/all/20240131230902.1867092-2-pbonzini%40redhat.com
Diffstat (limited to 'include/linux/fpga/fpga-mgr.h')
0 files changed, 0 insertions, 0 deletions