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KVM: introduce readonly memslot

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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>
This commit is contained in:
Xiao Guangrong 2012-08-21 11:02:51 +08:00 • committed by Avi Kivity
parent 7068d09715
commit 4d8b81abc4
7 changed files with 102 additions and 28 deletions
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6
include/linux/kvm.h
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@ -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