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| author | Alexander Graf <agraf@suse.de> | 2014-04-17 15:25:33 +0400 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-05-30 16:26:17 +0400 |
| commit | 8f20a3ab27342171462781cef4637c18d3dbc5f8 (patch) | |
| tree | 9f7320513c255bd7e9bd5f0e707a26d1b2453fcd /arch/powerpc/kvm/e500_emulate.c | |
| parent | 07fec1c2e75ef2f55d7a211414b0d63e185e84f0 (diff) | |
| download | linux-8f20a3ab27342171462781cef4637c18d3dbc5f8.tar.xz | |
KVM: PPC: E500: Add dcbtls emulation
The dcbtls instruction is able to lock data inside the L1 cache.
We don't want to give the guest actual access to hardware cache locks,
as that could influence other VMs on the same system. But we can tell
the guest that its locking attempt failed.
By implementing the instruction we at least don't give the guest a
program exception which it definitely does not expect.
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 | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/e500_emulate.c b/arch/powerpc/kvm/e500_emulate.c index 95d886f461fb..002d51764143 100644 --- a/arch/powerpc/kvm/e500_emulate.c +++ b/arch/powerpc/kvm/e500_emulate.c @@ -19,6 +19,7 @@ #include "booke.h" #include "e500.h" +#define XOP_DCBTLS 166 #define XOP_MSGSND 206 #define XOP_MSGCLR 238 #define XOP_TLBIVAX 786 @@ -103,6 +104,15 @@ static int kvmppc_e500_emul_ehpriv(struct kvm_run *run, struct kvm_vcpu *vcpu, return emulated; } +static int kvmppc_e500_emul_dcbtls(struct kvm_vcpu *vcpu) +{ + struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu); + + /* Always fail to lock the cache */ + vcpu_e500->l1csr0 |= L1CSR0_CUL; + return EMULATE_DONE; +} + int kvmppc_core_emulate_op_e500(struct kvm_run *run, struct kvm_vcpu *vcpu, unsigned int inst, int *advance) { @@ -116,6 +126,10 @@ int kvmppc_core_emulate_op_e500(struct kvm_run *run, struct kvm_vcpu *vcpu, case 31: switch (get_xop(inst)) { + case XOP_DCBTLS: + emulated = kvmppc_e500_emul_dcbtls(vcpu); + break; + #ifdef CONFIG_KVM_E500MC case XOP_MSGSND: emulated = kvmppc_e500_emul_msgsnd(vcpu, rb); |