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KVM: PPC: Book3S PR: Support TAR handling for PR KVM HTM

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Currently guest kernel doesn't handle TAR facility unavailable and it
always runs with TAR bit on. PR KVM will lazily enable TAR. TAR is not
a frequent-use register and it is not included in SVCPU struct.

Due to the above, the checkpointed TAR val might be a bogus TAR val.
To solve this issue, we will make vcpu->arch.fscr tar bit consistent
with shadow_fscr when TM is enabled.

At the end of emulating treclaim., the correct TAR val need to be loaded
into the register if FSCR_TAR bit is on.

At the beginning of emulating trechkpt., TAR needs to be flushed so that
the right tar val can be copied into tar_tm.

Tested with:
tools/testing/selftests/powerpc/tm/tm-tar
tools/testing/selftests/powerpc/ptrace/ptrace-tm-tar (remove DSCR/PPR
related testing).

Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Simon Guo 2018-05-23 15:02:07 +08:00 committed by Paul Mackerras
parent 68ab07b985
commit 7284ca8a5e
4 changed files with 38 additions and 7 deletions
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2
arch/powerpc/include/asm/kvm_book3s.h
View File

@ -271,6 +271,8 @@ static inline void kvmppc_save_tm_sprs(struct kvm_vcpu *vcpu) {}
static inline void kvmppc_restore_tm_sprs(struct kvm_vcpu *vcpu) {}
#endif
void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac);
extern int kvm_irq_bypass;
static inline struct kvmppc_vcpu_book3s *to_book3s(struct kvm_vcpu *vcpu)

4
arch/powerpc/kvm/book3s_emulate.c
View File

@ -173,6 +173,9 @@ static void kvmppc_emulate_treclaim(struct kvm_vcpu *vcpu, int ra_val)
guest_msr &= ~(MSR_TS_MASK);
kvmppc_set_msr(vcpu, guest_msr);
preempt_enable();
if (vcpu->arch.shadow_fscr & FSCR_TAR)
mtspr(SPRN_TAR, vcpu->arch.tar);
}
static void kvmppc_emulate_trchkpt(struct kvm_vcpu *vcpu)
@ -185,6 +188,7 @@ static void kvmppc_emulate_trchkpt(struct kvm_vcpu *vcpu)
* copy.
*/
kvmppc_giveup_ext(vcpu, MSR_VSX);
kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
kvmppc_copyto_vcpu_tm(vcpu);
kvmppc_save_tm_sprs(vcpu);

23
arch/powerpc/kvm/book3s_pr.c
View File

@ -55,7 +55,9 @@
static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
ulong msr);
static void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac);
#ifdef CONFIG_PPC_BOOK3S_64
static int kvmppc_handle_fac(struct kvm_vcpu *vcpu, ulong fac);
#endif
/* Some compatibility defines */
#ifdef CONFIG_PPC_BOOK3S_32
@ -346,6 +348,7 @@ void kvmppc_save_tm_pr(struct kvm_vcpu *vcpu)
return;
}
kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
kvmppc_giveup_ext(vcpu, MSR_VSX);
preempt_disable();
@ -357,8 +360,11 @@ void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu)
{
if (!MSR_TM_ACTIVE(kvmppc_get_msr(vcpu))) {
kvmppc_restore_tm_sprs(vcpu);
if (kvmppc_get_msr(vcpu) & MSR_TM)
if (kvmppc_get_msr(vcpu) & MSR_TM) {
kvmppc_handle_lost_math_exts(vcpu);
if (vcpu->arch.fscr & FSCR_TAR)
kvmppc_handle_fac(vcpu, FSCR_TAR_LG);
}
return;
}
@ -366,9 +372,11 @@ void kvmppc_restore_tm_pr(struct kvm_vcpu *vcpu)
_kvmppc_restore_tm_pr(vcpu, kvmppc_get_msr(vcpu));
preempt_enable();
if (kvmppc_get_msr(vcpu) & MSR_TM)
if (kvmppc_get_msr(vcpu) & MSR_TM) {
kvmppc_handle_lost_math_exts(vcpu);
if (vcpu->arch.fscr & FSCR_TAR)
kvmppc_handle_fac(vcpu, FSCR_TAR_LG);
}
}
#endif
@ -819,7 +827,7 @@ void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
}
/* Give up facility (TAR / EBB / DSCR) */
static void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac)
void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac)
{
#ifdef CONFIG_PPC_BOOK3S_64
if (!(vcpu->arch.shadow_fscr & (1ULL << fac))) {
@ -1020,7 +1028,12 @@ void kvmppc_set_fscr(struct kvm_vcpu *vcpu, u64 fscr)
if ((vcpu->arch.fscr & FSCR_TAR) && !(fscr & FSCR_TAR)) {
/* TAR got dropped, drop it in shadow too */
kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
} else if (!(vcpu->arch.fscr & FSCR_TAR) && (fscr & FSCR_TAR)) {
vcpu->arch.fscr = fscr;
kvmppc_handle_fac(vcpu, FSCR_TAR_LG);
return;
}
vcpu->arch.fscr = fscr;
}
#endif

16
arch/powerpc/kvm/tm.S
View File

@ -172,15 +172,21 @@ _GLOBAL(_kvmppc_save_tm_pr)
mfmsr r5
SAVE_GPR(5, r1)
/* also save DSCR/CR so that it can be recovered later */
/* also save DSCR/CR/TAR so that it can be recovered later */
mfspr r6, SPRN_DSCR
SAVE_GPR(6, r1)
mfcr r7
stw r7, _CCR(r1)
mfspr r8, SPRN_TAR
SAVE_GPR(8, r1)
bl __kvmppc_save_tm
REST_GPR(8, r1)
mtspr SPRN_TAR, r8
ld r7, _CCR(r1)
mtcr r7
@ -340,15 +346,21 @@ _GLOBAL(_kvmppc_restore_tm_pr)
mfmsr r5
SAVE_GPR(5, r1)
/* also save DSCR/CR so that it can be recovered later */
/* also save DSCR/CR/TAR so that it can be recovered later */
mfspr r6, SPRN_DSCR
SAVE_GPR(6, r1)
mfcr r7
stw r7, _CCR(r1)
mfspr r8, SPRN_TAR
SAVE_GPR(8, r1)
bl __kvmppc_restore_tm
REST_GPR(8, r1)
mtspr SPRN_TAR, r8
ld r7, _CCR(r1)
mtcr r7