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MIPS: KVM: Use kmap instead of CKSEG0ADDR()
There are several unportable uses of CKSEG0ADDR() in MIPS KVM, which implicitly assume that a host physical address will be in the low 512MB of the physical address space (accessible in KSeg0). These assumptions don't hold for highmem or on 64-bit kernels. When interpreting the guest physical address when reading or overwriting a trapping instruction, use kmap_atomic() to get a usable virtual address to access guest memory, which is portable to 64-bit and highmem kernels. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -11,6 +11,7 @@
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/highmem.h>
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#include <linux/kvm_host.h>
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#include <linux/module.h>
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#include <linux/vmalloc.h>
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@ -29,14 +30,18 @@
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static int kvm_mips_trans_replace(struct kvm_vcpu *vcpu, u32 *opc,
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union mips_instruction replace)
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{
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unsigned long kseg0_opc, flags;
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unsigned long paddr, flags;
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void *vaddr;
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if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) {
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kseg0_opc =
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CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa
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(vcpu, (unsigned long) opc));
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memcpy((void *)kseg0_opc, (void *)&replace, sizeof(u32));
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local_flush_icache_range(kseg0_opc, kseg0_opc + 32);
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paddr = kvm_mips_translate_guest_kseg0_to_hpa(vcpu,
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(unsigned long)opc);
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vaddr = kmap_atomic(pfn_to_page(PHYS_PFN(paddr)));
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vaddr += paddr & ~PAGE_MASK;
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memcpy(vaddr, (void *)&replace, sizeof(u32));
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local_flush_icache_range((unsigned long)vaddr,
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(unsigned long)vaddr + 32);
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kunmap_atomic(vaddr);
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} else if (KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) {
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local_irq_save(flags);
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memcpy((void *)opc, (void *)&replace, sizeof(u32));
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@ -9,6 +9,7 @@
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* Authors: Sanjay Lal <sanjayl@kymasys.com>
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*/
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#include <linux/highmem.h>
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#include <linux/kvm_host.h>
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#include <asm/mmu_context.h>
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@ -330,6 +331,7 @@ u32 kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu)
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struct mips_coproc *cop0 = vcpu->arch.cop0;
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unsigned long paddr, flags, vpn2, asid;
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unsigned long va = (unsigned long)opc;
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void *vaddr;
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u32 inst;
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int index;
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@ -360,7 +362,10 @@ u32 kvm_get_inst(u32 *opc, struct kvm_vcpu *vcpu)
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local_irq_restore(flags);
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} else if (KVM_GUEST_KSEGX(va) == KVM_GUEST_KSEG0) {
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paddr = kvm_mips_translate_guest_kseg0_to_hpa(vcpu, va);
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inst = *(u32 *) CKSEG0ADDR(paddr);
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vaddr = kmap_atomic(pfn_to_page(PHYS_PFN(paddr)));
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vaddr += paddr & ~PAGE_MASK;
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inst = *(u32 *)vaddr;
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kunmap_atomic(vaddr);
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} else {
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kvm_err("%s: illegal address: %p\n", __func__, opc);
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return KVM_INVALID_INST;
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