diff options
Diffstat (limited to 'drivers/kvm')
| -rw-r--r-- | drivers/kvm/kvm.h | 3 | ||||
| -rw-r--r-- | drivers/kvm/kvm_main.c | 24 | ||||
| -rw-r--r-- | drivers/kvm/mmu.c | 9 |
3 files changed, 36 insertions, 0 deletions
diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h index 58b9deb0bc0e..b7068ecd7765 100644 --- a/drivers/kvm/kvm.h +++ b/drivers/kvm/kvm.h @@ -448,6 +448,9 @@ int kvm_write_guest(struct kvm_vcpu *vcpu, unsigned long segment_base(u16 selector); +void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes); +void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes); + static inline struct page *_gfn_to_page(struct kvm *kvm, gfn_t gfn) { struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn); diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 68e121eeccbc..047f6f6ed3f6 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -877,6 +877,27 @@ static int emulator_read_emulated(unsigned long addr, } } +static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa, + unsigned long val, int bytes) +{ + struct kvm_memory_slot *m; + struct page *page; + void *virt; + + if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT)) + return 0; + m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT); + if (!m) + return 0; + page = gfn_to_page(m, gpa >> PAGE_SHIFT); + kvm_mmu_pre_write(vcpu, gpa, bytes); + virt = kmap_atomic(page, KM_USER0); + memcpy(virt + offset_in_page(gpa), &val, bytes); + kunmap_atomic(virt, KM_USER0); + kvm_mmu_post_write(vcpu, gpa, bytes); + return 1; +} + static int emulator_write_emulated(unsigned long addr, unsigned long val, unsigned int bytes, @@ -888,6 +909,9 @@ static int emulator_write_emulated(unsigned long addr, if (gpa == UNMAPPED_GVA) return X86EMUL_PROPAGATE_FAULT; + if (emulator_write_phys(vcpu, gpa, val, bytes)) + return X86EMUL_CONTINUE; + vcpu->mmio_needed = 1; vcpu->mmio_phys_addr = gpa; vcpu->mmio_size = bytes; diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c index ceae25bfd4b5..bce7eb21f739 100644 --- a/drivers/kvm/mmu.c +++ b/drivers/kvm/mmu.c @@ -956,6 +956,15 @@ int kvm_mmu_reset_context(struct kvm_vcpu *vcpu) return init_kvm_mmu(vcpu); } +void kvm_mmu_pre_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes) +{ + pgprintk("%s: gpa %llx bytes %d\n", __FUNCTION__, gpa, bytes); +} + +void kvm_mmu_post_write(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes) +{ +} + static void free_mmu_pages(struct kvm_vcpu *vcpu) { while (!list_empty(&vcpu->free_pages)) { |