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authorJan Kiszka <jan.kiszka@siemens.com>2012-01-25 18:14:15 +0100
committerMarcelo Tosatti <mtosatti@redhat.com>2012-02-08 15:57:50 -0200
commit39d6960aabfd90bf0bf7ba38d69e918962b70b16 (patch)
tree5bd0698b7cb7fe62efc169dc886d3584bee3b9b9 /target-i386
parentcf4dc461a4cfc3e056ee24edb26154f4d34a6278 (diff)
kvm: Allow to set shadow MMU size
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>
Diffstat (limited to 'target-i386')
-rw-r--r--target-i386/kvm.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index e41de394d2..445c06082c 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -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;
}