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Diffstat (limited to 'Documentation/virtual/kvm/api.txt')
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 22 |
1 files changed, 11 insertions, 11 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index b91bfd4..36befa7 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -874,17 +874,17 @@ It is recommended that the lower 21 bits of guest_phys_addr and userspace_addr be identical. This allows large pages in the guest to be backed by large pages in the host. -The flags field supports two flag, KVM_MEM_LOG_DIRTY_PAGES, which -instructs kvm to keep track of writes to memory within the slot. See -the KVM_GET_DIRTY_LOG ioctl. Another flag is KVM_MEM_READONLY when the -KVM_CAP_READONLY_MEM capability, it indicates the guest memory is read-only, -that means, guest is only allowed to read it. Writes will be posted to -userspace as KVM_EXIT_MMIO exits. - -When the KVM_CAP_SYNC_MMU capability, changes in the backing of the memory -region are automatically reflected into the guest. For example, an mmap() -that affects the region will be made visible immediately. Another example -is madvise(MADV_DROP). +The flags field supports two flag, KVM_MEM_LOG_DIRTY_PAGES, which instructs +kvm to keep track of writes to memory within the slot. See KVM_GET_DIRTY_LOG +ioctl. The KVM_CAP_READONLY_MEM capability indicates the availability of the +KVM_MEM_READONLY flag. When this flag is set for a memory region, KVM only +allows read accesses. Writes will be posted to userspace as KVM_EXIT_MMIO +exits. + +When the KVM_CAP_SYNC_MMU capability is available, changes in the backing of +the memory region are automatically reflected into the guest. For example, an +mmap() that affects the region will be made visible immediately. Another +example is madvise(MADV_DROP). It is recommended to use this API instead of the KVM_SET_MEMORY_REGION ioctl. The KVM_SET_MEMORY_REGION does not allow fine grained control over memory |