diff options
| author | Avi Kivity <avi@qumranet.com> | 2007-12-09 16:15:46 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-01-30 17:53:20 +0200 |
| commit | fe135d2ceb3d7dc08151b3cbad96565d02cc8676 (patch) | |
| tree | 7dec07ec0a32a53f003551802cb73c4ce3373527 /drivers/kvm/mmu.c | |
| parent | b3e4e63fd9ee8cd5d9047b89e0d463d5c48ee5b5 (diff) | |
KVM: MMU: Simplify calculation of pte access
The nx bit is awkwardly placed in the 63rd bit position; furthermore it
has a reversed meaning compared to the other bits, which means we can't use
a bitwise and to calculate compounded access masks.
So, we simplify things by creating a new 3-bit exec/write/user access word,
and doing all calculations in that.
Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/mmu.c')
| -rw-r--r-- | drivers/kvm/mmu.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c index 62a74151f84..f8a2137c64a 100644 --- a/drivers/kvm/mmu.c +++ b/drivers/kvm/mmu.c @@ -85,7 +85,8 @@ static int dbg = 1; #define PT_PAGE_SIZE_MASK (1ULL << 7) #define PT_PAT_MASK (1ULL << 7) #define PT_GLOBAL_MASK (1ULL << 8) -#define PT64_NX_MASK (1ULL << 63) +#define PT64_NX_SHIFT 63 +#define PT64_NX_MASK (1ULL << PT64_NX_SHIFT) #define PT_PAT_SHIFT 7 #define PT_DIR_PAT_SHIFT 12 @@ -153,6 +154,11 @@ static int dbg = 1; #define RMAP_EXT 4 +#define ACC_EXEC_MASK 1 +#define ACC_WRITE_MASK PT_WRITABLE_MASK +#define ACC_USER_MASK PT_USER_MASK +#define ACC_ALL (ACC_EXEC_MASK | ACC_WRITE_MASK | ACC_USER_MASK) + struct kvm_rmap_desc { u64 *shadow_ptes[RMAP_EXT]; struct kvm_rmap_desc *more; @@ -921,7 +927,7 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, struct page *page) >> PAGE_SHIFT; new_table = kvm_mmu_get_page(vcpu, pseudo_gfn, v, level - 1, - 1, 3, &table[index]); + 1, ACC_ALL, &table[index]); if (!new_table) { pgprintk("nonpaging_map: ENOMEM\n"); kvm_release_page_clean(page); @@ -988,7 +994,7 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu) ASSERT(!VALID_PAGE(root)); sp = kvm_mmu_get_page(vcpu, root_gfn, 0, - PT64_ROOT_LEVEL, 0, 0, NULL); + PT64_ROOT_LEVEL, 0, ACC_ALL, NULL); root = __pa(sp->spt); ++sp->root_count; vcpu->mmu.root_hpa = root; @@ -1009,7 +1015,7 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu) root_gfn = 0; sp = kvm_mmu_get_page(vcpu, root_gfn, i << 30, PT32_ROOT_LEVEL, !is_paging(vcpu), - 0, NULL); + ACC_ALL, NULL); root = __pa(sp->spt); ++sp->root_count; vcpu->mmu.pae_root[i] = root | PT_PRESENT_MASK; |