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| author | Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> | 2012-08-21 11:02:51 +0800 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-08-22 15:09:03 +0300 |
| commit | 4d8b81abc47b83a1939e59df2fdb0e98dfe0eedd (patch) | |
| tree | 47ea77cb4f77a2884a0478ecf84f62e32e5661ee /include/linux/kvm.h | |
| parent | 7068d0971524dd47a38f44f6020ba133432871ca (diff) | |
| download | lwn-4d8b81abc47b83a1939e59df2fdb0e98dfe0eedd.tar.gz lwn-4d8b81abc47b83a1939e59df2fdb0e98dfe0eedd.zip | |
KVM: introduce readonly memslot
In current code, if we map a readonly memory space from host to guest
and the page is not currently mapped in the host, we will get a fault
pfn and async is not allowed, then the vm will crash
We introduce readonly memory region to map ROM/ROMD to the guest, read access
is happy for readonly memslot, write access on readonly memslot will cause
KVM_EXIT_MMIO exit
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'include/linux/kvm.h')
| -rw-r--r-- | include/linux/kvm.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/kvm.h b/include/linux/kvm.h index 2de335d7f63e..d808694673f9 100644 --- a/include/linux/kvm.h +++ b/include/linux/kvm.h @@ -106,7 +106,8 @@ struct kvm_userspace_memory_region { * other bits are reserved for kvm internal use which are defined in * include/linux/kvm_host.h. */ -#define KVM_MEM_LOG_DIRTY_PAGES 1UL +#define KVM_MEM_LOG_DIRTY_PAGES (1UL << 0) +#define KVM_MEM_READONLY (1UL << 1) /* for KVM_IRQ_LINE */ struct kvm_irq_level { @@ -621,6 +622,9 @@ struct kvm_ppc_smmu_info { #define KVM_CAP_PPC_GET_SMMU_INFO 78 #define KVM_CAP_S390_COW 79 #define KVM_CAP_PPC_ALLOC_HTAB 80 +#ifdef __KVM_HAVE_READONLY_MEM +#define KVM_CAP_READONLY_MEM 81 +#endif #ifdef KVM_CAP_IRQ_ROUTING |