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62 lines
2.4 KiB
62 lines
2.4 KiB
2 months ago
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From d0163127a47250170e01e39f48250a2725f531c0 Mon Sep 17 00:00:00 2001
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From: Gavin Shan <gshan@redhat.com>
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Date: Tue, 1 Oct 2024 16:58:57 +1000
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Subject: [PATCH] hostmem: Apply merge property after the memory region is
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initialized
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RH-Author: Gavin Shan <gshan@redhat.com>
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RH-MergeRequest: 272: hostmem: Apply merge property after the memory region is initialized
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RH-Jira: RHEL-58936
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Eric Auger <eric.auger@redhat.com>
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RH-Acked-by: David Hildenbrand <david@redhat.com>
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RH-Commit: [1/1] aa47bedf64698b277bb8835f4689d4f1d5eca53c (gwshan/qemu-centos)
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JIRA: https://issues.redhat.com/browse/RHEL-58936
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The semantic change has been introduced by commit 5becdc0ab0 ("hostmem:
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simplify the code for merge and dump properties") even it clarifies that
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no senmatic change has been introduced. After the commit, the merge
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property can be applied even the corresponding memory region isn't
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initialized yet. This leads to crash dump by the following command
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lines.
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# /home/gavin/sandbox/qemu.main/build/qemu-system-aarch64 \
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-accel kvm -machine virt -cpu host \
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-object memory-backend-ram,id=mem-memN0,size=4096M,merge=off
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:
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qemu-system-aarch64: ../system/memory.c:2419: memory_region_get_ram_ptr: \
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Assertion `mr->ram_block' failed.
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Fix it by applying the merge property only when the memory region is
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initialized.
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Message-ID: <20240915233117.478169-1-gshan@redhat.com>
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Fixes: 5becdc0ab083 ("hostmem: simplify the code for merge and dump properties")
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Reported-by: Zhenyu Zhang <zhenyzha@redhat.com>
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Tested-by: Zhenyu Zhang <zhenyzha@redhat.com>
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Signed-off-by: Gavin Shan <gshan@redhat.com>
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Signed-off-by: David Hildenbrand <david@redhat.com>
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(cherry picked from commit 78c8f780d3f0d6d17aa93d6f99ff72960080fdd7)
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Signed-off-by: Gavin Shan <gshan@redhat.com>
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---
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backends/hostmem.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/backends/hostmem.c b/backends/hostmem.c
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index 4e5576a4ad..181446626a 100644
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--- a/backends/hostmem.c
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+++ b/backends/hostmem.c
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@@ -178,7 +178,7 @@ static void host_memory_backend_set_merge(Object *obj, bool value, Error **errp)
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return;
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}
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- if (!host_memory_backend_mr_inited(backend) &&
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+ if (host_memory_backend_mr_inited(backend) &&
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value != backend->merge) {
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void *ptr = memory_region_get_ram_ptr(&backend->mr);
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uint64_t sz = memory_region_size(&backend->mr);
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--
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2.39.3
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