hw/misc/aspeed_hace: Ensure HASH_IRQ is always set to prevent firmware hang

Currently, if the program encounters an unsupported algorithm, it does not set
the HASH_IRQ bit in the status register and send an interrupt to indicate
command completion. As a result, the FW gets stuck waiting for a completion
signal from the HACE module.

Additionally, in do_hash_operation, if an error occurs within the conditional
statement, the HASH_IRQ bit is not set in the status register. This causes the
firmware to continuously send HASH commands, as it is unaware that the HACE
model has completed processing the command.

To fix this, the HASH_IRQ bit in the status register must always be set to
ensure that the firmware receives an interrupt from the HACE module, preventing
it from getting stuck or repeatedly sending HASH commands.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Fixes: c5475b3 ("hw: Model ASPEED's Hash and Crypto Engine")
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250515081008.583578-4-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
(cherry picked from commit fb8e59abbe46957cd599bb9aa9221fad1e4e989e)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/hw/misc/aspeed_hace.c b/hw/misc/aspeed_hace.c
index 11bd25708e0edc975f9b93b04fa318230d522bc9..20f645f49bd72a88c53b224ddb2c909bb82cef0f 100644 (file)
--- a/hw/misc/aspeed_hace.c
+++ b/hw/misc/aspeed_hace.c
@@ -278,12 +278,6 @@ static void do_hash_operation(AspeedHACEState *s, int algo, bool sg_mode,
                             iov[i - 1].iov_len, false,
                             iov[i - 1].iov_len);
     }
-
-    /*
-     * Set status bits to indicate completion. Testing shows hardware sets
-     * these irrespective of HASH_IRQ_EN.
-     */
-    s->regs[R_STATUS] |= HASH_IRQ;
 }
 
 static uint64_t aspeed_hace_read(void *opaque, hwaddr addr, unsigned int size)
@@ -358,10 +352,16 @@ static void aspeed_hace_write(void *opaque, hwaddr addr, uint64_t data,
                 qemu_log_mask(LOG_GUEST_ERROR,
                         "%s: Invalid hash algorithm selection 0x%"PRIx64"\n",
                         __func__, data & ahc->hash_mask);
-                break;
+        } else {
+            do_hash_operation(s, algo, data & HASH_SG_EN,
+                    ((data & HASH_HMAC_MASK) == HASH_DIGEST_ACCUM));
         }
-        do_hash_operation(s, algo, data & HASH_SG_EN,
-                ((data & HASH_HMAC_MASK) == HASH_DIGEST_ACCUM));
+
+        /*
+         * Set status bits to indicate completion. Testing shows hardware sets
+         * these irrespective of HASH_IRQ_EN.
+         */
+        s->regs[R_STATUS] |= HASH_IRQ;
 
         if (data & HASH_IRQ_EN) {
             qemu_irq_raise(s->irq);