diff options
| author | Peng Hao <peng.hao2@zte.com.cn> | 2018-10-14 07:09:55 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-10-17 00:30:11 +0200 |
| commit | 0804c849f1df0992d39a37c4fc259f7f8b16f385 (patch) | |
| tree | 40ab26eea50c1c904522352d56870beb6126b20b /include/uapi | |
| parent | 9943450b7b8831c5045362eed45f6fefd1986d72 (diff) | |
kvm/x86 : add coalesced pio support
Coalesced pio is based on coalesced mmio and can be used for some port
like rtc port, pci-host config port and so on.
Specially in case of rtc as coalesced pio, some versions of windows guest
access rtc frequently because of rtc as system tick. guest access rtc like
this: write register index to 0x70, then write or read data from 0x71.
writing 0x70 port is just as index and do nothing else. So we can use
coalesced pio to handle this scene to reduce VM-EXIT time.
When starting and closing a virtual machine, it will access pci-host config
port frequently. So setting these port as coalesced pio can reduce startup
and shutdown time.
without my patch, get the vm-exit time of accessing rtc 0x70 and piix 0xcf8
using perf tools: (guest OS : windows 7 64bit)
IO Port Access Samples Samples% Time% Min Time Max Time Avg time
0x70:POUT 86 30.99% 74.59% 9us 29us 10.75us (+- 3.41%)
0xcf8:POUT 1119 2.60% 2.12% 2.79us 56.83us 3.41us (+- 2.23%)
with my patch
IO Port Access Samples Samples% Time% Min Time Max Time Avg time
0x70:POUT 106 32.02% 29.47% 0us 10us 1.57us (+- 7.38%)
0xcf8:POUT 1065 1.67% 0.28% 0.41us 65.44us 0.66us (+- 10.55%)
Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/uapi')
| -rw-r--r-- | include/uapi/linux/kvm.h | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 7785678caedb..97780a0277fe 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -420,13 +420,19 @@ struct kvm_run { struct kvm_coalesced_mmio_zone { __u64 addr; __u32 size; - __u32 pad; + union { + __u32 pad; + __u32 pio; + }; }; struct kvm_coalesced_mmio { __u64 phys_addr; __u32 len; - __u32 pad; + union { + __u32 pad; + __u32 pio; + }; __u8 data[8]; }; @@ -956,6 +962,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_MSR_PLATFORM_INFO 159 #define KVM_CAP_PPC_NESTED_HV 160 #define KVM_CAP_HYPERV_SEND_IPI 161 +#define KVM_CAP_COALESCED_PIO 162 #ifdef KVM_CAP_IRQ_ROUTING |