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| author | Simon Guo <wei.guo.simon@gmail.com> | 2018-05-23 15:01:58 +0800 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2018-06-01 10:29:55 +1000 |
| commit | 8d2e2fc5e082a7b3f858cefb6e65700f28d2955e (patch) | |
| tree | a19a6efb386cf16990f4d4ff6486c532bcc67d9f /arch/powerpc/include/asm/kvm_book3s.h | |
| parent | 66c33e796cf9d5f7150bf4c701786d0527b594b6 (diff) | |
KVM: PPC: Book3S PR: Add transaction memory save/restore skeleton
The transaction memory checkpoint area save/restore behavior is
triggered when VCPU qemu process is switching out/into CPU, i.e.
at kvmppc_core_vcpu_put_pr() and kvmppc_core_vcpu_load_pr().
MSR TM active state is determined by TS bits:
active: 10(transactional) or 01 (suspended)
inactive: 00 (non-transactional)
We don't "fake" TM functionality for guest. We "sync" guest virtual
MSR TM active state(10 or 01) with shadow MSR. That is to say,
we don't emulate a transactional guest with a TM inactive MSR.
TM SPR support(TFIAR/TFAR/TEXASR) has already been supported by
commit 9916d57e64a4 ("KVM: PPC: Book3S PR: Expose TM registers").
Math register support (FPR/VMX/VSX) will be done at subsequent
patch.
Whether TM context need to be saved/restored can be determined
by kvmppc_get_msr() TM active state:
* TM active - save/restore TM context
* TM inactive - no need to do so and only save/restore
TM SPRs.
Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>
Suggested-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch/powerpc/include/asm/kvm_book3s.h')
| -rw-r--r-- | arch/powerpc/include/asm/kvm_book3s.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h index 20d3d5a87296..fc15ad9dfc3b 100644 --- a/arch/powerpc/include/asm/kvm_book3s.h +++ b/arch/powerpc/include/asm/kvm_book3s.h @@ -257,6 +257,15 @@ extern int kvmppc_hcall_impl_pr(unsigned long cmd); extern int kvmppc_hcall_impl_hv_realmode(unsigned long cmd); extern void kvmppc_copy_to_svcpu(struct kvm_vcpu *vcpu); extern void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu); + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM +void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu); +void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu); +#else +static inline void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu) {} +static inline void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu) {} +#endif + extern int kvm_irq_bypass; static inline struct kvmppc_vcpu_book3s *to_book3s(struct kvm_vcpu *vcpu) |