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| author | Huaitong Han <huaitong.han@intel.com> | 2016-03-22 16:51:20 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-03-22 16:23:37 +0100 |
| commit | be94f6b71067df47d623fc6c6983a8dee504fb4d (patch) | |
| tree | c19c2f42c18e328bbb6efff88e286bce23c779f1 /arch/x86/kvm/paging_tmpl.h | |
| parent | 2d344105f57ca77fc9c5d4377f65d1082f71ac4b (diff) | |
| download | lwn-be94f6b71067df47d623fc6c6983a8dee504fb4d.tar.gz lwn-be94f6b71067df47d623fc6c6983a8dee504fb4d.zip | |
KVM, pkeys: add pkeys support for permission_fault
Protection keys define a new 4-bit protection key field (PKEY) in bits
62:59 of leaf entries of the page tables, the PKEY is an index to PKRU
register(16 domains), every domain has 2 bits(write disable bit, access
disable bit).
Static logic has been produced in update_pkru_bitmask, dynamic logic need
read pkey from page table entries, get pkru value, and deduce the correct
result.
[ Huaitong: Xiao helps to modify many sections. ]
Signed-off-by: Huaitong Han <huaitong.han@intel.com>
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/paging_tmpl.h')
| -rw-r--r-- | arch/x86/kvm/paging_tmpl.h | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 45ed3c38d20e..e0c225421157 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -257,6 +257,17 @@ static int FNAME(update_accessed_dirty_bits)(struct kvm_vcpu *vcpu, return 0; } +static inline unsigned FNAME(gpte_pkeys)(struct kvm_vcpu *vcpu, u64 gpte) +{ + unsigned pkeys = 0; +#if PTTYPE == 64 + pte_t pte = {.pte = gpte}; + + pkeys = pte_flags_pkey(pte_flags(pte)); +#endif + return pkeys; +} + /* * Fetch a guest pte for a guest virtual address */ @@ -268,7 +279,7 @@ static int FNAME(walk_addr_generic)(struct guest_walker *walker, pt_element_t pte; pt_element_t __user *uninitialized_var(ptep_user); gfn_t table_gfn; - unsigned index, pt_access, pte_access, accessed_dirty; + unsigned index, pt_access, pte_access, accessed_dirty, pte_pkey; gpa_t pte_gpa; int offset; const int write_fault = access & PFERR_WRITE_MASK; @@ -359,7 +370,8 @@ retry_walk: walker->ptes[walker->level - 1] = pte; } while (!is_last_gpte(mmu, walker->level, pte)); - errcode = permission_fault(vcpu, mmu, pte_access, access); + pte_pkey = FNAME(gpte_pkeys)(vcpu, pte); + errcode = permission_fault(vcpu, mmu, pte_access, pte_pkey, access); if (unlikely(errcode)) goto error; |