diff options
| author | Adam Dunlap <[email protected]> | 2023-09-11 17:27:02 -0700 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2023-09-28 22:49:35 +0200 |
| commit | f79936545fb122856bd78b189d3c7ee59928c751 (patch) | |
| tree | 0ecbebf171b37820ec7c62c999f03294c301bf70 /drivers/cdx/controller/cdx_controller.c | |
| parent | f4c5ca9850124fb5715eff06cffb1beed837500c (diff) | |
x86/sev-es: Allow copy_from_kernel_nofault() in earlier boot
Previously, if copy_from_kernel_nofault() was called before
boot_cpu_data.x86_virt_bits was set up, then it would trigger undefined
behavior due to a shift by 64.
This ended up causing boot failures in the latest version of ubuntu2204
in the gcp project when using SEV-SNP.
Specifically, this function is called during an early #VC handler which
is triggered by a CPUID to check if NX is implemented.
Fixes: 1aa9aa8ee517 ("x86/sev-es: Setup GHCB-based boot #VC handler")
Suggested-by: Dave Hansen <[email protected]>
Signed-off-by: Adam Dunlap <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Tested-by: Jacob Xu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Diffstat (limited to 'drivers/cdx/controller/cdx_controller.c')
0 files changed, 0 insertions, 0 deletions