From: Sami Mujawar <sami.mujawar@arm.com>
Date: Fri, 10 Apr 2026 16:36:36 +0000 (+0100)
Subject: virt: arm-cca-guest: fix error check for RSI_INCOMPLETE
X-Git-Url: http://git.ipfire.org/index.cgi?a=commitdiff_plain;h=e534e9d13d0b7bdbb2cccdace7b96b769a10540e;p=thirdparty%2Fkernel%2Flinux.git

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

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: 7999edc484ca ("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>
---

diff --git a/drivers/virt/coco/arm-cca-guest/arm-cca-guest.c b/drivers/virt/coco/arm-cca-guest/arm-cca-guest.c
index 0c9ea24a200c9..66d00b6ceb789 100644
--- a/drivers/virt/coco/arm-cca-guest/arm-cca-guest.c
+++ b/drivers/virt/coco/arm-cca-guest/arm-cca-guest.c
@@ -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;