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virt: arm-cca-guest: fix error check for RSI_INCOMPLETE

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The RSI interface can return RSI_INCOMPLETE when a report spans
multiple granules. This is an expected condition and should not be
treated as a fatal error.

Currently, arm_cca_report_new() checks for `info.result != RSI_SUCCESS`
and bails out, which incorrectly flags RSI_INCOMPLETE as a failure.
Fix the check to only break out on results other than RSI_SUCCESS or
RSI_INCOMPLETE.

This ensures partial reports are handled correctly and avoids spurious
-ENXIO errors when generating attestation reports.

Fixes: 7999edc484 ("virt: arm-cca-guest: TSM_REPORT support for realms")
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Reported-by: Jagdish Gediya <Jagdish.Gediya@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Sami Mujawar
2026-04-10 17:36:36 +01:00
committed by Catalin Marinas
parent 680b961ebf
commit e534e9d13d
1 changed files with 2 additions and 1 deletions
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3
drivers/virt/coco/arm-cca-guest/arm-cca-guest.c
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@@ -157,7 +157,8 @@ static int arm_cca_report_new(struct tsm_report *report, void *data)
} while (info.result == RSI_INCOMPLETE &&
info.offset < RSI_GRANULE_SIZE);
if (info.result != RSI_SUCCESS) {
/* Break out in case of failure */
if (info.result != RSI_SUCCESS && info.result != RSI_INCOMPLETE) {
ret = -ENXIO;
token_size = 0;
goto exit_free_granule_page;