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| author | Mihai Caraman <mihai.caraman@freescale.com> | 2014-07-23 19:06:21 +0300 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-07-28 15:23:14 +0200 |
| commit | 51f047261e717b74b226f837a16455994b61ae30 (patch) | |
| tree | e94a57703fed176a72acef425cea442a8395746b /arch/powerpc/kvm/book3s.c | |
| parent | 9a26af64d6bba72c9dfd62cc0cab0e79f8a66d7b (diff) | |
| download | linux-stable-51f047261e717b74b226f837a16455994b61ae30.tar.gz linux-stable-51f047261e717b74b226f837a16455994b61ae30.tar.bz2 linux-stable-51f047261e717b74b226f837a16455994b61ae30.zip | |
KVM: PPC: Allow kvmppc_get_last_inst() to fail
On book3e, guest last instruction is read on the exit path using load
external pid (lwepx) dedicated instruction. This load operation may fail
due to TLB eviction and execute-but-not-read entries.
This patch lay down the path for an alternative solution to read the guest
last instruction, by allowing kvmppc_get_lat_inst() function to fail.
Architecture specific implmentations of kvmppc_load_last_inst() may read
last guest instruction and instruct the emulation layer to re-execute the
guest in case of failure.
Make kvmppc_get_last_inst() definition common between architectures.
Signed-off-by: Mihai Caraman <mihai.caraman@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/book3s.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c index 31facfc1314b..37ca8a0897c3 100644 --- a/arch/powerpc/kvm/book3s.c +++ b/arch/powerpc/kvm/book3s.c @@ -488,6 +488,23 @@ mmio: } EXPORT_SYMBOL_GPL(kvmppc_ld); +int kvmppc_load_last_inst(struct kvm_vcpu *vcpu, enum instruction_type type, + u32 *inst) +{ + ulong pc = kvmppc_get_pc(vcpu); + int r; + + if (type == INST_SC) + pc -= 4; + + r = kvmppc_ld(vcpu, &pc, sizeof(u32), inst, false); + if (r == EMULATE_DONE) + return r; + else + return EMULATE_AGAIN; +} +EXPORT_SYMBOL_GPL(kvmppc_load_last_inst); + int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) { return 0; |