41 lines
1.5 KiB
Diff
41 lines
1.5 KiB
Diff
From 3d83dfa18e0e64a0a16dfd692ad98273b60d4417 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= <berrange@redhat.com>
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Date: Tue, 10 Jun 2025 13:36:56 +0100
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Subject: [PATCH] hw/misc/aspeed_hace: skip automatic zero-init of large array
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The 'do_hash_operation' method has a 256 element iovec array used for
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holding pointers to data that is to be hashed. Skip the automatic
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zero-init of this array to eliminate the performance overhead in the
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I/O hot path.
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The 'iovec' array will be selectively initialized based on data that
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needs to be hashed.
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Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
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Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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Message-id: 20250610123709.835102-19-berrange@redhat.com
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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---
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hw/misc/aspeed_hace.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/hw/misc/aspeed_hace.c b/hw/misc/aspeed_hace.c
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index c06c04ddc..d2118f186 100644
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--- a/hw/misc/aspeed_hace.c
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+++ b/hw/misc/aspeed_hace.c
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@@ -188,7 +188,7 @@ static int gen_acc_mode_iov(AspeedHACEState *s, struct iovec *iov, int id,
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static void do_hash_operation(AspeedHACEState *s, int algo, bool sg_mode,
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bool acc_mode)
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{
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- struct iovec iov[ASPEED_HACE_MAX_SG];
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+ QEMU_UNINITIALIZED struct iovec iov[ASPEED_HACE_MAX_SG];
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g_autofree uint8_t *digest_buf = NULL;
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size_t digest_len = 0;
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int niov = 0;
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--
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2.43.5
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