From: Suresh E. Warrier Date: Thu, 4 Dec 2014 00:48:10 +0000 (-0600) Subject: KVM: PPC: Book3S HV: Tracepoints for KVM HV guest interactions X-Git-Tag: omap-for-v3.19/fixes-rc1~43^2^2~4 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3c78f78af95615b017be751e763e623b6252d166;p=pandora-kernel.git KVM: PPC: Book3S HV: Tracepoints for KVM HV guest interactions This patch adds trace points in the guest entry and exit code and also for exceptions handled by the host in kernel mode - hypercalls and page faults. The new events are added to /sys/kernel/debug/tracing/events under a new subsystem called kvm_hv. Acked-by: Paul Mackerras Signed-off-by: Suresh Warrier Signed-off-by: Alexander Graf --- diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c index 59425f143c6d..311e4a38dd8b 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_hv.c +++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c @@ -37,6 +37,8 @@ #include #include +#include "trace_hv.h" + /* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */ #define MAX_LPID_970 63 @@ -622,6 +624,8 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, gfn = gpa >> PAGE_SHIFT; memslot = gfn_to_memslot(kvm, gfn); + trace_kvm_page_fault_enter(vcpu, hpte, memslot, ea, dsisr); + /* No memslot means it's an emulated MMIO region */ if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID)) return kvmppc_hv_emulate_mmio(run, vcpu, gpa, ea, @@ -641,6 +645,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, mmu_seq = kvm->mmu_notifier_seq; smp_rmb(); + ret = -EFAULT; is_io = 0; pfn = 0; page = NULL; @@ -664,7 +669,7 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, } up_read(¤t->mm->mmap_sem); if (!pfn) - return -EFAULT; + goto out_put; } else { page = pages[0]; pfn = page_to_pfn(page); @@ -694,14 +699,14 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, } } - ret = -EFAULT; if (psize > pte_size) goto out_put; /* Check WIMG vs. the actual page we're accessing */ if (!hpte_cache_flags_ok(r, is_io)) { if (is_io) - return -EFAULT; + goto out_put; + /* * Allow guest to map emulated device memory as * uncacheable, but actually make it cacheable. @@ -765,6 +770,8 @@ int kvmppc_book3s_hv_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu, SetPageDirty(page); out_put: + trace_kvm_page_fault_exit(vcpu, hpte, ret); + if (page) { /* * We drop pages[0] here, not page because page might Reading git-diff-tree failed