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| author | Cédric Le Goater <clg@kaod.org> | 2019-05-13 10:42:34 +0200 |
|---|---|---|
| committer | David Gibson <david@gibson.dropbear.id.au> | 2019-05-29 11:39:45 +1000 |
| commit | 0c575703e487b6e36d226b67e0c8d08c004ce998 (patch) | |
| tree | 65df568ec35b18ea8029da81f5f0a4672dff2efd /hw/core/qdev-properties-system.c | |
| parent | 38afd772f802ff787ea16af73b0c0d24a8c46b6c (diff) | |
| download | focaccia-qemu-0c575703e487b6e36d226b67e0c8d08c004ce998.tar.gz focaccia-qemu-0c575703e487b6e36d226b67e0c8d08c004ce998.zip | |
spapr/xive: add hcall support when under KVM
XIVE hcalls are all redirected to QEMU as none are on a fast path.
When necessary, QEMU invokes KVM through specific ioctls to perform
host operations. QEMU should have done the necessary checks before
calling KVM and, in case of failure, H_HARDWARE is simply returned.
H_INT_ESB is a special case that could have been handled under KVM
but the impact on performance was low when under QEMU. Here are some
figures :
kernel irqchip OFF ON
H_INT_ESB KVM QEMU
rtl8139 (LSI ) 1.19 1.24 1.23 Gbits/sec
virtio 31.80 42.30 -- Gbits/sec
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20190513084245.25755-4-clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'hw/core/qdev-properties-system.c')
0 files changed, 0 insertions, 0 deletions