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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 9916d57e64
("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>
This commit is contained in:
parent
66c33e796c
commit
8d2e2fc5e0
3 changed files with 36 additions and 1 deletions
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@ -257,6 +257,15 @@ extern int kvmppc_hcall_impl_pr(unsigned long cmd);
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extern int kvmppc_hcall_impl_hv_realmode(unsigned long cmd);
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extern void kvmppc_copy_to_svcpu(struct kvm_vcpu *vcpu);
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extern void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu);
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#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
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void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu);
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void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu);
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#else
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static inline void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu) {}
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static inline void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu) {}
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#endif
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extern int kvm_irq_bypass;
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static inline struct kvmppc_vcpu_book3s *to_book3s(struct kvm_vcpu *vcpu)
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@ -627,7 +627,6 @@ struct kvm_vcpu_arch {
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struct thread_vr_state vr_tm;
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u32 vrsave_tm; /* also USPRG0 */
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#endif
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#ifdef CONFIG_KVM_EXIT_TIMING
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@ -43,6 +43,7 @@
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#include <linux/module.h>
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#include <linux/miscdevice.h>
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#include <asm/asm-prototypes.h>
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#include <asm/tm.h>
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#include "book3s.h"
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@ -115,6 +116,8 @@ static void kvmppc_core_vcpu_load_pr(struct kvm_vcpu *vcpu, int cpu)
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if (kvmppc_is_split_real(vcpu))
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kvmppc_fixup_split_real(vcpu);
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kvmppc_restore_tm_pr(vcpu);
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}
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static void kvmppc_core_vcpu_put_pr(struct kvm_vcpu *vcpu)
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@ -134,6 +137,7 @@ static void kvmppc_core_vcpu_put_pr(struct kvm_vcpu *vcpu)
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kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
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kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
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kvmppc_save_tm_pr(vcpu);
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/* Enable AIL if supported */
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if (cpu_has_feature(CPU_FTR_HVMODE) &&
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@ -304,6 +308,29 @@ static inline void kvmppc_restore_tm_sprs(struct kvm_vcpu *vcpu)
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tm_disable();
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}
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void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu)
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{
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if (!(MSR_TM_ACTIVE(kvmppc_get_msr(vcpu)))) {
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kvmppc_save_tm_sprs(vcpu);
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return;
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}
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preempt_disable();
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_kvmppc_save_tm_pr(vcpu, mfmsr());
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preempt_enable();
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}
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void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu)
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{
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if (!MSR_TM_ACTIVE(kvmppc_get_msr(vcpu))) {
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kvmppc_restore_tm_sprs(vcpu);
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return;
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}
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preempt_disable();
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_kvmppc_restore_tm_pr(vcpu, kvmppc_get_msr(vcpu));
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preempt_enable();
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}
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#endif
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static int kvmppc_core_check_requests_pr(struct kvm_vcpu *vcpu)
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