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Third PPC KVM update for 5.1 

- Tell userspace about whether a particular hardware workaround for
   one of the Spectre vulnerabilities is available, so that userspace
   can inform the guest.
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Merge tag 'kvm-ppc-next-5.1-3' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into HEAD

Third PPC KVM update for 5.1

- Tell userspace about whether a particular hardware workaround for
  one of the Spectre vulnerabilities is available, so that userspace
  can inform the guest.
This commit is contained in:
Paolo Bonzini 2019-03-15 19:16:51 +01:00
parent 4633323648 2b57ecd020
commit c7a0e83cb6
3 changed files with 17 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/include/asm/kvm_ppc.h
View File

@ -619,7 +619,7 @@ static inline int kvmppc_xive_set_irq(struct kvm *kvm, int irq_source_id, u32 ir
static inline void kvmppc_xive_push_vcpu(struct kvm_vcpu *vcpu) { }
#endif /* CONFIG_KVM_XIVE */
#ifdef CONFIG_PPC_POWERNV
#if defined(CONFIG_PPC_POWERNV) && defined(CONFIG_KVM_BOOK3S_64_HANDLER)
static inline bool xics_on_xive(void)
{
return xive_enabled() && cpu_has_feature(CPU_FTR_HVMODE);

2
arch/powerpc/include/uapi/asm/kvm.h
View File

@ -463,10 +463,12 @@ struct kvm_ppc_cpu_char {
#define KVM_PPC_CPU_CHAR_BR_HINT_HONOURED (1ULL << 58)
#define KVM_PPC_CPU_CHAR_MTTRIG_THR_RECONF (1ULL << 57)
#define KVM_PPC_CPU_CHAR_COUNT_CACHE_DIS (1ULL << 56)
#define KVM_PPC_CPU_CHAR_BCCTR_FLUSH_ASSIST (1ull << 54)
#define KVM_PPC_CPU_BEHAV_FAVOUR_SECURITY (1ULL << 63)
#define KVM_PPC_CPU_BEHAV_L1D_FLUSH_PR (1ULL << 62)
#define KVM_PPC_CPU_BEHAV_BNDS_CHK_SPEC_BAR (1ULL << 61)
#define KVM_PPC_CPU_BEHAV_FLUSH_COUNT_CACHE (1ull << 58)
/* Per-vcpu XICS interrupt controller state */
#define KVM_REG_PPC_ICP_STATE (KVM_REG_PPC | KVM_REG_SIZE_U64 | 0x8c)

18
arch/powerpc/kvm/powerpc.c
View File

@ -2189,10 +2189,12 @@ static int pseries_get_cpu_char(struct kvm_ppc_cpu_char *cp)
KVM_PPC_CPU_CHAR_L1D_THREAD_PRIV |
KVM_PPC_CPU_CHAR_BR_HINT_HONOURED |
KVM_PPC_CPU_CHAR_MTTRIG_THR_RECONF |
KVM_PPC_CPU_CHAR_COUNT_CACHE_DIS;
KVM_PPC_CPU_CHAR_COUNT_CACHE_DIS |
KVM_PPC_CPU_CHAR_BCCTR_FLUSH_ASSIST;
cp->behaviour_mask = KVM_PPC_CPU_BEHAV_FAVOUR_SECURITY |
KVM_PPC_CPU_BEHAV_L1D_FLUSH_PR |
KVM_PPC_CPU_BEHAV_BNDS_CHK_SPEC_BAR;
KVM_PPC_CPU_BEHAV_BNDS_CHK_SPEC_BAR |
KVM_PPC_CPU_BEHAV_FLUSH_COUNT_CACHE;
}
return 0;
}
@ -2251,12 +2253,16 @@ static int kvmppc_get_cpu_char(struct kvm_ppc_cpu_char *cp)
if (have_fw_feat(fw_features, "enabled",
"fw-count-cache-disabled"))
cp->character |= KVM_PPC_CPU_CHAR_COUNT_CACHE_DIS;
if (have_fw_feat(fw_features, "enabled",
"fw-count-cache-flush-bcctr2,0,0"))
cp->character |= KVM_PPC_CPU_CHAR_BCCTR_FLUSH_ASSIST;
cp->character_mask = KVM_PPC_CPU_CHAR_SPEC_BAR_ORI31 |
KVM_PPC_CPU_CHAR_BCCTRL_SERIALISED |
KVM_PPC_CPU_CHAR_L1D_FLUSH_ORI30 |
KVM_PPC_CPU_CHAR_L1D_FLUSH_TRIG2 |
KVM_PPC_CPU_CHAR_L1D_THREAD_PRIV |
KVM_PPC_CPU_CHAR_COUNT_CACHE_DIS;
KVM_PPC_CPU_CHAR_COUNT_CACHE_DIS |
KVM_PPC_CPU_CHAR_BCCTR_FLUSH_ASSIST;
if (have_fw_feat(fw_features, "enabled",
"speculation-policy-favor-security"))
@ -2267,9 +2273,13 @@ static int kvmppc_get_cpu_char(struct kvm_ppc_cpu_char *cp)
if (!have_fw_feat(fw_features, "disabled",
"needs-spec-barrier-for-bound-checks"))
cp->behaviour |= KVM_PPC_CPU_BEHAV_BNDS_CHK_SPEC_BAR;
if (have_fw_feat(fw_features, "enabled",
"needs-count-cache-flush-on-context-switch"))
cp->behaviour |= KVM_PPC_CPU_BEHAV_FLUSH_COUNT_CACHE;
cp->behaviour_mask = KVM_PPC_CPU_BEHAV_FAVOUR_SECURITY |
KVM_PPC_CPU_BEHAV_L1D_FLUSH_PR |
KVM_PPC_CPU_BEHAV_BNDS_CHK_SPEC_BAR;
KVM_PPC_CPU_BEHAV_BNDS_CHK_SPEC_BAR |
KVM_PPC_CPU_BEHAV_FLUSH_COUNT_CACHE;
of_node_put(fw_features);
}