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[Qemu-devel] [PATCH] extend limit of physical sections number
From: |
Amos Kong |
Subject: |
[Qemu-devel] [PATCH] extend limit of physical sections number |
Date: |
Sat, 28 Sep 2013 00:49:20 +0800 |
# qemu -drive file=/disk0,if=none,id=v0,format=qcow2 \
-device virtio-blk-pci,drive=v0,id=v00,multifunction=on,addr=0x04.0
....
Launching guest with more than 32 virtio-blk disks,
qemu will crash, because there are too many BARs.
This patch brings the limit of non-tcg up by a factor
of 8 (32767 / 4096), i.e. 32*8 = 256.
Signed-off-by: Paolo Bonzini <address@hidden>
Signed-off-by: Amos Kong <address@hidden>
---
exec.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
diff --git a/exec.c b/exec.c
index 5aef833..f639c01 100644
--- a/exec.c
+++ b/exec.c
@@ -763,11 +763,18 @@ void phys_mem_set_alloc(void *(*alloc)(ram_addr_t))
static uint16_t phys_section_add(MemoryRegionSection *section)
{
- /* The physical section number is ORed with a page-aligned
- * pointer to produce the iotlb entries. Thus it should
- * never overflow into the page-aligned value.
- */
- assert(next_map.sections_nb < TARGET_PAGE_SIZE);
+ if (tcg_enabled()) {
+ /* The physical section number is ORed with a page-aligned
+ * pointer to produce the iotlb entries. Thus it should
+ * never overflow into the page-aligned value.
+ */
+ assert(next_map.sections_nb < TARGET_PAGE_SIZE);
+ } else {
+ /* For KVM or Xen we can use the full range of the ptr field
+ * in PhysPageEntry.
+ */
+ assert(next_map.sections_nb < SHRT_MAX);
+ }
if (next_map.sections_nb == next_map.sections_nb_alloc) {
next_map.sections_nb_alloc = MAX(next_map.sections_nb_alloc * 2,
--
1.8.3.1
- [Qemu-devel] [PATCH] extend limit of physical sections number,
Amos Kong <=