[Bug 115451] memset hang on pci device memory using kvm

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https://bugzilla.kernel.org/show_bug.cgi?id=115451

--- Comment #2 from Gaurav Sharma <gauravs.2010@gmail.com> ---
Following is the system info :
Host machine kernel version : 2.6.18-308.el5
Guest OS : Debian 3.2.0-4-686-pae
KVM vesrion : QEMU PC emulator version 0.9.1

Following are the steps to re-create the issue :
1. Boot the guest OS using QEMU with KVM enabled.
2. lspci will list down the pci devices configured on the guest OS.
3. I have a some PCI device configured with bar0 memory.
4. modify the pcimem.c application to use call memset

// This code is being modified to call memset to do a bulk write transaction
case 'w':
         fprintf(stderr, "Before doing memset\n");
         memset((virt_addr), 1, datalen);
         fprintf(stderr, "after doing memset\n");
         break;

5. Call the pcimem application to write on bar0 memory.
6. It results in memset call in hang, and the application needs to be
explicitly killed. I do not get the log message after memset call.

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