From 4d8b81abc47b83a1939e59df2fdb0e98dfe0eedd Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Tue, 21 Aug 2012 11:02:51 +0800 Subject: 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 Signed-off-by: Avi Kivity --- include/linux/kvm.h | 6 +++++- include/linux/kvm_host.h | 7 +------ 2 files changed, 6 insertions(+), 7 deletions(-) (limited to 'include/linux') 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 diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index a913ac709a9d..5972c9845ddb 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -465,6 +465,7 @@ int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages, struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn); unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn); +unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn); void kvm_release_page_clean(struct page *page); void kvm_release_page_dirty(struct page *page); void kvm_set_page_dirty(struct page *page); @@ -792,12 +793,6 @@ hva_to_gfn_memslot(unsigned long hva, struct kvm_memory_slot *slot) return slot->base_gfn + gfn_offset; } -static inline unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, - gfn_t gfn) -{ - return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE; -} - static inline gpa_t gfn_to_gpa(gfn_t gfn) { return (gpa_t)gfn << PAGE_SHIFT; -- cgit v1.2.3