From: Alexander Graf Date: Fri, 18 Jan 2013 01:31:01 +0000 (+0100) Subject: KVM: PPC: E500: Propagate errors when shadow mapping X-Git-Tag: v3.12-rc1~895^2~157 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2c378fd779d2b37aed64cb44caa607707edc51d3;p=kernel%2Fkernel-generic.git KVM: PPC: E500: Propagate errors when shadow mapping When shadow mapping a page, mapping this page can fail. In that case we don't have a shadow map. Take this case into account, otherwise we might end up writing bogus TLB entries into the host TLB. While at it, also move the write_stlbe() calls into the respective TLBn handlers. Signed-off-by: Alexander Graf --- diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c index 8efb2ac..3777167 100644 --- a/arch/powerpc/kvm/e500_tlb.c +++ b/arch/powerpc/kvm/e500_tlb.c @@ -432,7 +432,7 @@ static inline void kvmppc_e500_setup_stlbe( #endif } -static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, +static inline int kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, u64 gvaddr, gfn_t gfn, struct kvm_book3e_206_tlb_entry *gtlbe, int tlbsel, struct kvm_book3e_206_tlb_entry *stlbe, struct tlbe_ref *ref) @@ -551,7 +551,7 @@ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, if (is_error_noslot_pfn(pfn)) { printk(KERN_ERR "Couldn't get real page for gfn %lx!\n", (long)gfn); - return; + return -EINVAL; } /* Align guest and physical address to page map boundaries */ @@ -571,22 +571,33 @@ static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500, /* Drop refcount on page, so that mmu notifiers can clear it */ kvm_release_pfn_clean(pfn); + + return 0; } /* XXX only map the one-one case, for now use TLB0 */ -static void kvmppc_e500_tlb0_map(struct kvmppc_vcpu_e500 *vcpu_e500, - int esel, - struct kvm_book3e_206_tlb_entry *stlbe) +static int kvmppc_e500_tlb0_map(struct kvmppc_vcpu_e500 *vcpu_e500, + int esel, + struct kvm_book3e_206_tlb_entry *stlbe) { struct kvm_book3e_206_tlb_entry *gtlbe; struct tlbe_ref *ref; + int stlbsel = 0; + int sesel = 0; + int r; gtlbe = get_entry(vcpu_e500, 0, esel); ref = &vcpu_e500->gtlb_priv[0][esel].ref; - kvmppc_e500_shadow_map(vcpu_e500, get_tlb_eaddr(gtlbe), + r = kvmppc_e500_shadow_map(vcpu_e500, get_tlb_eaddr(gtlbe), get_tlb_raddr(gtlbe) >> PAGE_SHIFT, gtlbe, 0, stlbe, ref); + if (r) + return r; + + write_stlbe(vcpu_e500, gtlbe, stlbe, stlbsel, sesel); + + return 0; } /* Caller must ensure that the specified guest TLB entry is safe to insert into @@ -597,25 +608,32 @@ static int kvmppc_e500_tlb1_map(struct kvmppc_vcpu_e500 *vcpu_e500, struct kvm_book3e_206_tlb_entry *stlbe, int esel) { struct tlbe_ref *ref; - unsigned int victim; + unsigned int sesel; + int r; + int stlbsel = 1; - victim = vcpu_e500->host_tlb1_nv++; + sesel = vcpu_e500->host_tlb1_nv++; if (unlikely(vcpu_e500->host_tlb1_nv >= tlb1_max_shadow_size())) vcpu_e500->host_tlb1_nv = 0; - ref = &vcpu_e500->tlb_refs[1][victim]; - kvmppc_e500_shadow_map(vcpu_e500, gvaddr, gfn, gtlbe, 1, stlbe, ref); + ref = &vcpu_e500->tlb_refs[1][sesel]; + r = kvmppc_e500_shadow_map(vcpu_e500, gvaddr, gfn, gtlbe, 1, stlbe, + ref); + if (r) + return r; - vcpu_e500->g2h_tlb1_map[esel] |= (u64)1 << victim; + vcpu_e500->g2h_tlb1_map[esel] |= (u64)1 << sesel; vcpu_e500->gtlb_priv[1][esel].ref.flags |= E500_TLB_BITMAP; - if (vcpu_e500->h2g_tlb1_rmap[victim]) { - unsigned int idx = vcpu_e500->h2g_tlb1_rmap[victim]; - vcpu_e500->g2h_tlb1_map[idx] &= ~(1ULL << victim); + if (vcpu_e500->h2g_tlb1_rmap[sesel]) { + unsigned int idx = vcpu_e500->h2g_tlb1_rmap[sesel]; + vcpu_e500->g2h_tlb1_map[idx] &= ~(1ULL << sesel); } - vcpu_e500->h2g_tlb1_rmap[victim] = esel; + vcpu_e500->h2g_tlb1_rmap[sesel] = esel; - return victim; + write_stlbe(vcpu_e500, gtlbe, stlbe, stlbsel, sesel); + + return 0; } static void kvmppc_recalc_tlb1map_range(struct kvmppc_vcpu_e500 *vcpu_e500) @@ -1034,30 +1052,27 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr, struct kvm_book3e_206_tlb_entry *gtlbe, stlbe; int tlbsel = tlbsel_of(index); int esel = esel_of(index); - int stlbsel, sesel; gtlbe = get_entry(vcpu_e500, tlbsel, esel); switch (tlbsel) { case 0: - stlbsel = 0; - sesel = 0; /* unused */ priv = &vcpu_e500->gtlb_priv[tlbsel][esel]; - /* Only triggers after clear_tlb_refs */ - if (unlikely(!(priv->ref.flags & E500_TLB_VALID))) + /* Triggers after clear_tlb_refs or on initial mapping */ + if (!(priv->ref.flags & E500_TLB_VALID)) { kvmppc_e500_tlb0_map(vcpu_e500, esel, &stlbe); - else + } else { kvmppc_e500_setup_stlbe(vcpu, gtlbe, BOOK3E_PAGESZ_4K, &priv->ref, eaddr, &stlbe); + write_stlbe(vcpu_e500, gtlbe, &stlbe, 0, 0); + } break; case 1: { gfn_t gfn = gpaddr >> PAGE_SHIFT; - - stlbsel = 1; - sesel = kvmppc_e500_tlb1_map(vcpu_e500, eaddr, gfn, - gtlbe, &stlbe, esel); + kvmppc_e500_tlb1_map(vcpu_e500, eaddr, gfn, gtlbe, &stlbe, + esel); break; } @@ -1065,8 +1080,6 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr, BUG(); break; } - - write_stlbe(vcpu_e500, gtlbe, &stlbe, stlbsel, sesel); } /************* MMU Notifiers *************/