From b8f79ddb7db95bb675b3d6009e7a4274161e1e53 Mon Sep 17 00:00:00 2001 From: James Hogan Date: Mon, 11 May 2015 23:31:45 +0100 Subject: [PATCH] KVM: MIPS/T&E: Treat unhandled guest KSeg0 as MMIO MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Treat unhandled accesses to guest KSeg0 as MMIO, rather than only host KSeg0 addresses. This will allow read only memory regions (such as the Malta boot flash as emulated by QEMU) to have writes (before reads) treated as MMIO, and unallocated physical addresses to have all accesses treated as MMIO. The MMIO emulation uses the gva_to_gpa callback, so this is also updated for trap & emulate to handle guest KSeg0 addresses. Signed-off-by: James Hogan Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Ralf Baechle Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org --- arch/mips/kvm/mmu.c | 1 - arch/mips/kvm/trap_emul.c | 10 +++++----- 2 files changed, 5 insertions(+), 6 deletions(-) diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c index 1af65f2e6bb7..934bcc3732da 100644 --- a/arch/mips/kvm/mmu.c +++ b/arch/mips/kvm/mmu.c @@ -350,7 +350,6 @@ static int kvm_mips_map_page(struct kvm_vcpu *vcpu, unsigned long gpa, pfn = gfn_to_pfn(kvm, gfn); if (is_error_noslot_pfn(pfn)) { - kvm_err("Couldn't get pfn for gfn %#llx!\n", gfn); err = -EFAULT; goto out; } diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c index ae971ae30e30..77e059068a29 100644 --- a/arch/mips/kvm/trap_emul.c +++ b/arch/mips/kvm/trap_emul.c @@ -23,9 +23,12 @@ static gpa_t kvm_trap_emul_gva_to_gpa_cb(gva_t gva) { gpa_t gpa; gva_t kseg = KSEGX(gva); + gva_t gkseg = KVM_GUEST_KSEGX(gva); if ((kseg == CKSEG0) || (kseg == CKSEG1)) gpa = CPHYSADDR(gva); + else if (gkseg == KVM_GUEST_KSEG0) + gpa = KVM_GUEST_CPHYSADDR(gva); else { kvm_err("%s: cannot find GPA for GVA: %#lx\n", __func__, gva); kvm_mips_dump_host_tlbs(); @@ -240,11 +243,8 @@ static int kvm_trap_emul_handle_tlb_miss(struct kvm_vcpu *vcpu, bool store) * All KSEG0 faults are handled by KVM, as the guest kernel does * not expect to ever get them */ - if (kvm_mips_handle_kseg0_tlb_fault - (vcpu->arch.host_cp0_badvaddr, vcpu, store) < 0) { - run->exit_reason = KVM_EXIT_INTERNAL_ERROR; - ret = RESUME_HOST; - } + if (kvm_mips_handle_kseg0_tlb_fault(badvaddr, vcpu, store) < 0) + ret = kvm_mips_bad_access(cause, opc, run, vcpu, store); } else if (KVM_GUEST_KERNEL_MODE(vcpu) && (KSEGX(badvaddr) == CKSEG0 || KSEGX(badvaddr) == CKSEG1)) { /*