#include <linux/string.h>
#include <linux/mm.h>
#include <linux/highmem.h>
-#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/export.h>
#include <linux/swap.h>
#include <linux/hugetlb.h>
#include <linux/compiler.h>
static u64 __read_mostly shadow_accessed_mask;
static u64 __read_mostly shadow_dirty_mask;
static u64 __read_mostly shadow_mmio_mask;
+static u64 __read_mostly shadow_present_mask;
static void mmu_spte_set(u64 *sptep, u64 spte);
static void mmu_free_roots(struct kvm_vcpu *vcpu);
}
void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,
- u64 dirty_mask, u64 nx_mask, u64 x_mask)
+ u64 dirty_mask, u64 nx_mask, u64 x_mask, u64 p_mask)
{
shadow_user_mask = user_mask;
shadow_accessed_mask = accessed_mask;
shadow_dirty_mask = dirty_mask;
shadow_nx_mask = nx_mask;
shadow_x_mask = x_mask;
+ shadow_present_mask = p_mask;
}
EXPORT_SYMBOL_GPL(kvm_mmu_set_mask_ptes);
static int is_shadow_present_pte(u64 pte)
{
- return pte & PT_PRESENT_MASK && !is_mmio_spte(pte);
+ return (pte & 0xFFFFFFFFull) && !is_mmio_spte(pte);
}
static int is_large_pte(u64 pte)
#ifdef CONFIG_X86_64
static void __set_spte(u64 *sptep, u64 spte)
{
- *sptep = spte;
+ WRITE_ONCE(*sptep, spte);
}
static void __update_clear_spte_fast(u64 *sptep, u64 spte)
{
- *sptep = spte;
+ WRITE_ONCE(*sptep, spte);
}
static u64 __update_clear_spte_slow(u64 *sptep, u64 spte)
*/
smp_wmb();
- ssptep->spte_low = sspte.spte_low;
+ WRITE_ONCE(ssptep->spte_low, sspte.spte_low);
}
static void __update_clear_spte_fast(u64 *sptep, u64 spte)
ssptep = (union split_spte *)sptep;
sspte = (union split_spte)spte;
- ssptep->spte_low = sspte.spte_low;
+ WRITE_ONCE(ssptep->spte_low, sspte.spte_low);
/*
* If we map the spte from present to nonpresent, we should clear
}
/* Rules for using mmu_spte_update:
- * Update the state bits, it means the mapped pfn is not changged.
+ * Update the state bits, it means the mapped pfn is not changed.
*
* Whenever we overwrite a writable spte with a read-only one we
* should flush remote TLBs. Otherwise rmap_write_protect
* since it has been deleted from active_mmu_pages but still can be found
* at hast list.
*
- * for_each_gfn_indirect_valid_sp has skipped that kind of page and
- * kvm_mmu_get_page(), the only user of for_each_gfn_sp(), has skipped
- * all the obsolete pages.
+ * for_each_gfn_valid_sp() has skipped that kind of pages.
*/
-#define for_each_gfn_sp(_kvm, _sp, _gfn) \
+#define for_each_gfn_valid_sp(_kvm, _sp, _gfn) \
hlist_for_each_entry(_sp, \
&(_kvm)->arch.mmu_page_hash[kvm_page_table_hashfn(_gfn)], hash_link) \
- if ((_sp)->gfn != (_gfn)) {} else
+ if ((_sp)->gfn != (_gfn) || is_obsolete_sp((_kvm), (_sp)) \
+ || (_sp)->role.invalid) {} else
#define for_each_gfn_indirect_valid_sp(_kvm, _sp, _gfn) \
- for_each_gfn_sp(_kvm, _sp, _gfn) \
- if ((_sp)->role.direct || (_sp)->role.invalid) {} else
+ for_each_gfn_valid_sp(_kvm, _sp, _gfn) \
+ if ((_sp)->role.direct) {} else
/* @sp->gfn should be write-protected at the call site */
static bool __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
static void mmu_audit_disable(void) { }
#endif
+static bool is_obsolete_sp(struct kvm *kvm, struct kvm_mmu_page *sp)
+{
+ return unlikely(sp->mmu_valid_gen != kvm->arch.mmu_valid_gen);
+}
+
static bool kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
struct list_head *invalid_list)
{
__clear_sp_write_flooding_count(sp);
}
-static bool is_obsolete_sp(struct kvm *kvm, struct kvm_mmu_page *sp)
-{
- return unlikely(sp->mmu_valid_gen != kvm->arch.mmu_valid_gen);
-}
-
static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
gfn_t gfn,
gva_t gaddr,
quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1;
role.quadrant = quadrant;
}
- for_each_gfn_sp(vcpu->kvm, sp, gfn) {
- if (is_obsolete_sp(vcpu->kvm, sp))
- continue;
-
+ for_each_gfn_valid_sp(vcpu->kvm, sp, gfn) {
if (!need_sync && sp->unsync)
need_sync = true;
{
u64 spte;
- BUILD_BUG_ON(VMX_EPT_READABLE_MASK != PT_PRESENT_MASK ||
- VMX_EPT_WRITABLE_MASK != PT_WRITABLE_MASK);
+ BUILD_BUG_ON(VMX_EPT_WRITABLE_MASK != PT_WRITABLE_MASK);
- spte = __pa(sp->spt) | PT_PRESENT_MASK | PT_WRITABLE_MASK |
+ spte = __pa(sp->spt) | shadow_present_mask | PT_WRITABLE_MASK |
shadow_user_mask | shadow_x_mask | shadow_accessed_mask;
mmu_spte_set(sptep, spte);
gfn_t gfn, kvm_pfn_t pfn, bool speculative,
bool can_unsync, bool host_writable)
{
- u64 spte;
+ u64 spte = 0;
int ret = 0;
if (set_mmio_spte(vcpu, sptep, gfn, pfn, pte_access))
return 0;
- spte = PT_PRESENT_MASK;
+ /*
+ * For the EPT case, shadow_present_mask is 0 if hardware
+ * supports exec-only page table entries. In that case,
+ * ACC_USER_MASK and shadow_user_mask are used to represent
+ * read access. See FNAME(gpte_access) in paging_tmpl.h.
+ */
+ spte |= shadow_present_mask;
if (!speculative)
spte |= shadow_accessed_mask;
MMU_WARN_ON(VALID_PAGE(root));
if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) {
pdptr = vcpu->arch.mmu.get_pdptr(vcpu, i);
- if (!is_present_gpte(pdptr)) {
+ if (!(pdptr & PT_PRESENT_MASK)) {
vcpu->arch.mmu.pae_root[i] = 0;
continue;
}
__reset_rsvds_bits_mask(vcpu, &context->shadow_zero_check,
boot_cpu_data.x86_phys_bits,
context->shadow_root_level, false,
- cpu_has_gbpages, true, true);
+ boot_cpu_has(X86_FEATURE_GBPAGES),
+ true, true);
else
__reset_rsvds_bits_mask_ept(&context->shadow_zero_check,
boot_cpu_data.x86_phys_bits,
* clearer.
*/
smap = cr4_smap && u && !uf && !ff;
- } else
- /* Not really needed: no U/S accesses on ept */
- u = 1;
+ }
fault = (ff && !x) || (uf && !u) || (wf && !w) ||
(smapf && smap);
projects / linux-2.6-block.git / blobdiff