* [Qemu-devel] e1000 emulation and mmio_exists counter
@ 2016-03-14 17:02 alexnln
0 siblings, 0 replies; only message in thread
From: alexnln @ 2016-03-14 17:02 UTC (permalink / raw)
To: qemu-devel
Hi list,
I am testing e1000 emulation with qemu 2.5. Command line:
-netdev tap,fd=21,id=hostnet0 \
-device e1000,netdev=hostnet0,id=net0,mac=$MAC1,bus=pci.0,addr=0x4
AFAIU, e1000 is emulated in qemu (userspace) and each i/o should cause
vmexit to userspace. And each exit to userspace should increment
mmio_exits counter (/sys/kernel/debug/kvm/mmio_exits).
As I see in kvm code,
kvm_mmu_page_fault() in arch/x86/kvm/mmu.c, case for EMULATE_USER_EXIT.
http://lxr.free-electrons.com/source/arch/x86/kvm/mmu.c#L4391
However, when I run load I see that mmio_exits counter is almost constant.
What am I missing here?
Thank you
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2016-03-14 17:02 [Qemu-devel] e1000 emulation and mmio_exists counter alexnln
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