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KVM: PPC: Book3S PR: Add guard code to prevent returning to guest with PR=0 and Transactional state

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Currently PR KVM doesn't support transaction memory in guest privileged
state.

This patch adds a check at setting guest msr, so that we can never return
to guest with PR=0 and TS=0b10. A tabort will be emulated to indicate
this and fail transaction immediately.

[paulus@ozlabs.org - don't change the TM_CAUSE_MISC definition, instead
 use TM_CAUSE_KVM_FAC_UNAV.]

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 15:02:06 +08:00 committed by Paul Mackerras
parent 26798f88d5
commit 68ab07b985
3 changed files with 19 additions and 2 deletions
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6
arch/powerpc/kvm/book3s.h
View file

@ -31,4 +31,10 @@ extern int kvmppc_core_emulate_mfspr_pr(struct kvm_vcpu *vcpu,
extern int kvmppc_book3s_init_pr(void);
extern void kvmppc_book3s_exit_pr(void);
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
extern void kvmppc_emulate_tabort(struct kvm_vcpu *vcpu, int ra_val);
#else
static inline void kvmppc_emulate_tabort(struct kvm_vcpu *vcpu, int ra_val) {}
#endif
#endif

2
arch/powerpc/kvm/book3s_emulate.c
View file

@ -199,7 +199,7 @@ static void kvmppc_emulate_trchkpt(struct kvm_vcpu *vcpu)
}
/* emulate tabort. at guest privilege state */
static void kvmppc_emulate_tabort(struct kvm_vcpu *vcpu, int ra_val)
void kvmppc_emulate_tabort(struct kvm_vcpu *vcpu, int ra_val)
{
/* currently we only emulate tabort. but no emulation of other
* tabort variants since there is no kernel usage of them at

13
arch/powerpc/kvm/book3s_pr.c
View file

@ -446,12 +446,23 @@ static void kvm_set_spte_hva_pr(struct kvm *kvm, unsigned long hva, pte_t pte)
static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
{
ulong old_msr = kvmppc_get_msr(vcpu);
ulong old_msr;
#ifdef EXIT_DEBUG
printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
#endif
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
/* We should never target guest MSR to TS=10 && PR=0,
* since we always fail transaction for guest privilege
* state.
*/
if (!(msr & MSR_PR) && MSR_TM_TRANSACTIONAL(msr))
kvmppc_emulate_tabort(vcpu,
TM_CAUSE_KVM_FAC_UNAV | TM_CAUSE_PERSISTENT);
#endif
old_msr = kvmppc_get_msr(vcpu);
msr &= to_book3s(vcpu)->msr_mask;
kvmppc_set_msr_fast(vcpu, msr);
kvmppc_recalc_shadow_msr(vcpu);