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KVM: MIPS: Pass type of fault down to kvm_mips_map_page()

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kvm_mips_map_page() will need to know whether the fault was due to a
read or a write in order to support dirty page tracking,
KVM_CAP_SYNC_MMU, and read only memory regions, so get that information
passed down to it via new bool write_fault arguments to various
functions.

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
This commit is contained in:
James Hogan
2015-05-01 14:56:31 +01:00
parent 89d6ad8a6b
commit 577ed7f71e
4 changed files with 25 additions and 16 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
arch/mips/kvm/mmu.c
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@@ -308,6 +308,7 @@ bool kvm_mips_flush_gpa_pt(struct kvm *kvm, gfn_t start_gfn, gfn_t end_gfn)
* kvm_mips_map_page() - Map a guest physical page.
* @vcpu: VCPU pointer.
* @gpa: Guest physical address of fault.
* @write_fault: Whether the fault was due to a write.
* @out_entry: New PTE for @gpa (written on success unless NULL).
* @out_buddy: New PTE for @gpa's buddy (written on success unless
* NULL).
@@ -327,6 +328,7 @@ bool kvm_mips_flush_gpa_pt(struct kvm *kvm, gfn_t start_gfn, gfn_t end_gfn)
* as an MMIO access.
*/
static int kvm_mips_map_page(struct kvm_vcpu *vcpu, unsigned long gpa,
bool write_fault,
pte_t *out_entry, pte_t *out_buddy)
{
struct kvm *kvm = vcpu->kvm;
@@ -558,7 +560,8 @@ void kvm_mips_flush_gva_pt(pgd_t *pgd, enum kvm_mips_flush flags)
/* XXXKYMA: Must be called with interrupts disabled */
int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
struct kvm_vcpu *vcpu)
struct kvm_vcpu *vcpu,
bool write_fault)
{
unsigned long gpa;
kvm_pfn_t pfn0, pfn1;
@@ -576,10 +579,11 @@ int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
gpa = KVM_GUEST_CPHYSADDR(badvaddr & (PAGE_MASK << 1));
vaddr = badvaddr & (PAGE_MASK << 1);
if (kvm_mips_map_page(vcpu, gpa, &pte_gpa[0], NULL) < 0)
if (kvm_mips_map_page(vcpu, gpa, write_fault, &pte_gpa[0], NULL) < 0)
return -1;
if (kvm_mips_map_page(vcpu, gpa | PAGE_SIZE, &pte_gpa[1], NULL) < 0)
if (kvm_mips_map_page(vcpu, gpa | PAGE_SIZE, write_fault, &pte_gpa[1],
NULL) < 0)
return -1;
pfn0 = pte_pfn(pte_gpa[0]);
@@ -604,7 +608,8 @@ int kvm_mips_handle_kseg0_tlb_fault(unsigned long badvaddr,
int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
struct kvm_mips_tlb *tlb,
unsigned long gva)
unsigned long gva,
bool write_fault)
{
kvm_pfn_t pfn;
long tlb_lo = 0;
@@ -621,8 +626,8 @@ int kvm_mips_handle_mapped_seg_tlb_fault(struct kvm_vcpu *vcpu,
tlb_lo = tlb->tlb_lo[idx];
/* Find host PFN */
if (kvm_mips_map_page(vcpu, mips3_tlbpfn_to_paddr(tlb_lo), &pte_gpa,
NULL) < 0)
if (kvm_mips_map_page(vcpu, mips3_tlbpfn_to_paddr(tlb_lo), write_fault,
&pte_gpa, NULL) < 0)
return -1;
pfn = pte_pfn(pte_gpa);
@@ -757,7 +762,7 @@ enum kvm_mips_fault_result kvm_trap_emul_gva_fault(struct kvm_vcpu *vcpu,
int index;
if (KVM_GUEST_KSEGX(gva) == KVM_GUEST_KSEG0) {
if (kvm_mips_handle_kseg0_tlb_fault(gva, vcpu) < 0)
if (kvm_mips_handle_kseg0_tlb_fault(gva, vcpu, write) < 0)
return KVM_MIPS_GPA;
} else if ((KVM_GUEST_KSEGX(gva) < KVM_GUEST_KSEG0) ||
KVM_GUEST_KSEGX(gva) == KVM_GUEST_KSEG23) {
@@ -774,7 +779,7 @@ enum kvm_mips_fault_result kvm_trap_emul_gva_fault(struct kvm_vcpu *vcpu,
if (write && !TLB_IS_DIRTY(*tlb, gva))
return KVM_MIPS_TLBMOD;
if (kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, gva))
if (kvm_mips_handle_mapped_seg_tlb_fault(vcpu, tlb, gva, write))
return KVM_MIPS_GPA;
} else {
return KVM_MIPS_GVA;