diff options
Diffstat (limited to 'qemu-options.hx')
| -rw-r--r-- | qemu-options.hx | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/qemu-options.hx b/qemu-options.hx index e22fb94d99..ecdb064409 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -141,6 +141,7 @@ DEF("accel", HAS_ARG, QEMU_OPTION_accel, " kvm-shadow-mem=size of KVM shadow MMU in bytes\n" " split-wx=on|off (enable TCG split w^x mapping)\n" " tb-size=n (TCG translation block cache size)\n" + " dirty-ring-size=n (KVM dirty ring GFN count, default 0)\n" " thread=single|multi (enable multi-threaded TCG)\n", QEMU_ARCH_ALL) SRST ``-accel name[,prop=value[,...]]`` @@ -181,6 +182,17 @@ SRST where both the back-end and front-ends support it and no incompatible TCG features have been enabled (e.g. icount/replay). + + ``dirty-ring-size=n`` + When the KVM accelerator is used, it controls the size of the per-vCPU + dirty page ring buffer (number of entries for each vCPU). It should + be a value that is power of two, and it should be 1024 or bigger (but + still less than the maximum value that the kernel supports). 4096 + could be a good initial value if you have no idea which is the best. + Set this value to 0 to disable the feature. By default, this feature + is disabled (dirty-ring-size=0). When enabled, KVM will instead + record dirty pages in a bitmap. + ERST DEF("smp", HAS_ARG, QEMU_OPTION_smp, |