diff options
Diffstat (limited to 'drivers/kvm/kvm_main.c')
| -rw-r--r-- | drivers/kvm/kvm_main.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 68e121e..047f6f6 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; |