mirror of
https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
platform/x86/intel/ifs: Disable irq during one load stage
One of the stages in IFS image loading process involves loading individual chunks (test patterns) from test image file to secure memory. Driver issues a WRMSR(MSR_AUTHENTICATE_AND_COPY_CHUNK) operation to do this. This operation can take up to 5 msec, and if an interrupt occurs in between, the AUTH_AND_COPY_CHUNK u-code implementation aborts the operation. Interrupt sources such as NMI or SMI are handled by retrying. Regular interrupts may occur frequently enough to prevent this operation from ever completing. Disable irq on local cpu around the aforementioned WRMSR to allow the operation to complete. Signed-off-by: Jithu Joseph <jithu.joseph@intel.com> Reviewed-by: Tony Luck <tony.luck@intel.com> Reviewed-by: Ashok Raj <ashok.raj@intel.com> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Link: https://lore.kernel.org/r/20240412172349.544064-4-jithu.joseph@intel.com Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
parent
15b429f4e0
commit
bd25a3f5ed
|
@ -233,7 +233,9 @@ static int copy_hashes_authenticate_chunks_gen2(struct device *dev)
|
|||
chunk_table[0] = starting_chunk_nr + i;
|
||||
chunk_table[1] = linear_addr;
|
||||
do {
|
||||
local_irq_disable();
|
||||
wrmsrl(MSR_AUTHENTICATE_AND_COPY_CHUNK, (u64)chunk_table);
|
||||
local_irq_enable();
|
||||
rdmsrl(MSR_CHUNKS_AUTHENTICATION_STATUS, chunk_status.data);
|
||||
err_code = chunk_status.error_code;
|
||||
} while (err_code == AUTH_INTERRUPTED_ERROR && --retry_count);
|
||||
|
|
Loading…
Reference in a new issue