From: Jithu Joseph Date: Fri, 12 Apr 2024 17:23:49 +0000 (-0700) Subject: platform/x86/intel/ifs: Disable irq during one load stage X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=bd25a3f5ed51540d873c6c581f4dab08aedc73ea;p=linux.git 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 Reviewed-by: Tony Luck Reviewed-by: Ashok Raj Reviewed-by: Kuppuswamy Sathyanarayanan Link: https://lore.kernel.org/r/20240412172349.544064-4-jithu.joseph@intel.com Reviewed-by: Hans de Goede Signed-off-by: Hans de Goede --- diff --git a/drivers/platform/x86/intel/ifs/load.c b/drivers/platform/x86/intel/ifs/load.c index 584c44387e103..39f19cb517498 100644 --- a/drivers/platform/x86/intel/ifs/load.c +++ b/drivers/platform/x86/intel/ifs/load.c @@ -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);