motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-04 08:13:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

kvm: Allow to set shadow MMU size

Browse source 
Introduce the KVM-specific machine option kvm_shadow_mem. It allows to
set a custom shadow MMU size for the virtual machine. This is useful for
stress testing e.g.

Only x86 supports this for now, but it is in principle a generic
concept for all targets with shadow MMUs.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Jan Kiszka 2012-01-25 18:14:15 +01:00 • committed by Marcelo Tosatti
parent cf4dc461a4
commit 39d6960aab
3 changed files with 21 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

13
target-i386/kvm.c
View file

@ -646,7 +646,9 @@ static int kvm_get_supported_msrs(KVMState *s)
int kvm_arch_init(KVMState *s)
{
QemuOptsList *list = qemu_find_opts("machine");
uint64_t identity_base = 0xfffbc000;
uint64_t shadow_mem;
int ret;
struct utsname utsname;
@ -693,6 +695,17 @@ int kvm_arch_init(KVMState *s)
}
qemu_register_reset(kvm_unpoison_all, NULL);
if (!QTAILQ_EMPTY(&list->head)) {
shadow_mem = qemu_opt_get_size(QTAILQ_FIRST(&list->head),
"kvm_shadow_mem", -1);
if (shadow_mem != -1) {
shadow_mem /= 4096;
ret = kvm_vm_ioctl(s, KVM_SET_NR_MMU_PAGES, shadow_mem);
if (ret < 0) {
return ret;
}
}
}
return 0;
}