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From: David Hildenbrand <david@redhat.com>
To: qemu-devel@nongnu.org
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
	"Philippe Mathieu-Daudé" <philmd@redhat.com>,
	"Peter Xu" <peterx@redhat.com>,
	"David Hildenbrand" <david@redhat.com>
Subject: [PATCH-for-6.1 v2] softmmu/physmem: fix wrong assertion in qemu_ram_alloc_internal()
Date: Thu,  5 Aug 2021 11:23:50 +0200	[thread overview]
Message-ID: <20210805092350.31195-1-david@redhat.com> (raw)

When adding RAM_NORESERVE, we forgot to remove the old assertion when
adding the updated one, most probably when reworking the patches or
rebasing. We can easily crash QEMU by adding
  -object memory-backend-ram,id=mem0,size=500G,reserve=off
to the QEMU cmdline:
  qemu-system-x86_64: ../softmmu/physmem.c:2146: qemu_ram_alloc_internal:
  Assertion `(ram_flags & ~(RAM_SHARED | RAM_RESIZEABLE | RAM_PREALLOC))
  == 0' failed.

Fix it by removing the old assertion.

Fixes: 8dbe22c6868b ("memory: Introduce RAM_NORESERVE and wire it up in qemu_ram_mmap()")
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---

v1 -> v2:
- Added rbs
- Tagged for 6.1 inclusion

---
 softmmu/physmem.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/softmmu/physmem.c b/softmmu/physmem.c
index 3c1912a1a0..2e18947598 100644
--- a/softmmu/physmem.c
+++ b/softmmu/physmem.c
@@ -2143,7 +2143,6 @@ RAMBlock *qemu_ram_alloc_internal(ram_addr_t size, ram_addr_t max_size,
     RAMBlock *new_block;
     Error *local_err = NULL;
 
-    assert((ram_flags & ~(RAM_SHARED | RAM_RESIZEABLE | RAM_PREALLOC)) == 0);
     assert((ram_flags & ~(RAM_SHARED | RAM_RESIZEABLE | RAM_PREALLOC |
                           RAM_NORESERVE)) == 0);
     assert(!host ^ (ram_flags & RAM_PREALLOC));
-- 
2.31.1



             reply	other threads:[~2021-08-05  9:24 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-05  9:23 David Hildenbrand [this message]
2021-08-06  5:04 ` [PATCH-for-6.1 v2] softmmu/physmem: fix wrong assertion in qemu_ram_alloc_internal() Pankaj Gupta
2021-08-16 20:52 ` Peter Xu
2021-08-17  7:14   ` David Hildenbrand
2021-08-17 14:25     ` Peter Xu
2021-08-17 15:51     ` Peter Maydell

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