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| author | Liu Yu <yu.liu@freescale.com> | 2011-06-14 18:35:14 -0500 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-07-12 13:16:39 +0300 |
| commit | dd9ebf1f94354b010f2ac7a98bf69168636cb08e (patch) | |
| tree | d7a6cbe2b31cd7349913d289b715fa1086ba0a1a /arch/powerpc/kvm/e500_emulate.c | |
| parent | 08b7fa92b9250eab0f493f7721977e781a887b3d (diff) | |
| download | linux-dd9ebf1f94354b010f2ac7a98bf69168636cb08e.tar.bz2 | |
KVM: PPC: e500: Add shadow PID support
Dynamically assign host PIDs to guest PIDs, splitting each guest PID into
multiple host (shadow) PIDs based on kernel/user and MSR[IS/DS]. Use
both PID0 and PID1 so that the shadow PIDs for the right mode can be
selected, that correspond both to guest TID = zero and guest TID = guest
PID.
This allows us to significantly reduce the frequency of needing to
invalidate the entire TLB. When the guest mode or PID changes, we just
update the host PID0/PID1. And since the allocation of shadow PIDs is
global, multiple guests can share the TLB without conflict.
Note that KVM does not yet support the guest setting PID1 or PID2 to
a value other than zero. This will need to be fixed for nested KVM
to work. Until then, we enforce the requirement for guest PID1/PID2
to stay zero by failing the emulation if the guest tries to set them
to something else.
Signed-off-by: Liu Yu <yu.liu@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/e500_emulate.c')
| -rw-r--r-- | arch/powerpc/kvm/e500_emulate.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/e500_emulate.c b/arch/powerpc/kvm/e500_emulate.c index 69cd665a0caf..d48ae396f41e 100644 --- a/arch/powerpc/kvm/e500_emulate.c +++ b/arch/powerpc/kvm/e500_emulate.c @@ -81,8 +81,12 @@ int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs) kvmppc_set_pid(vcpu, spr_val); break; case SPRN_PID1: + if (spr_val != 0) + return EMULATE_FAIL; vcpu_e500->pid[1] = spr_val; break; case SPRN_PID2: + if (spr_val != 0) + return EMULATE_FAIL; vcpu_e500->pid[2] = spr_val; break; case SPRN_MAS0: vcpu_e500->mas0 = spr_val; break; |