39 lines
1.4 KiB
Diff
39 lines
1.4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Alexander Bulekov <alxndr@bu.edu>
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Date: Mon, 13 Mar 2023 04:24:16 -0400
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Subject: [PATCH] memory: Allow disabling re-entrancy checking per-MR
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Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
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---
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include/exec/memory.h | 3 +++
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softmmu/memory.c | 2 +-
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2 files changed, 4 insertions(+), 1 deletion(-)
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diff --git a/include/exec/memory.h b/include/exec/memory.h
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index 15ade918ba..e6819e3c39 100644
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--- a/include/exec/memory.h
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+++ b/include/exec/memory.h
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@@ -791,6 +791,9 @@ struct MemoryRegion {
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unsigned ioeventfd_nb;
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MemoryRegionIoeventfd *ioeventfds;
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RamDiscardManager *rdm; /* Only for RAM */
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+
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+ /* For devices designed to perform re-entrant IO into their own IO MRs */
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+ bool disable_reentrancy_guard;
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};
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struct IOMMUMemoryRegion {
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diff --git a/softmmu/memory.c b/softmmu/memory.c
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index e4d2268d32..d88acb204b 100644
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--- a/softmmu/memory.c
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+++ b/softmmu/memory.c
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@@ -544,7 +544,7 @@ static MemTxResult access_with_adjusted_size(hwaddr addr,
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}
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/* Do not allow more than one simultanous access to a device's IO Regions */
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- if (mr->owner &&
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+ if (mr->owner && !mr->disable_reentrancy_guard &&
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!mr->ram_device && !mr->ram && !mr->rom_device && !mr->readonly) {
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dev = (DeviceState *) object_dynamic_cast(mr->owner, TYPE_DEVICE);
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if (dev) {
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