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-rw-r--r--tools/testing/selftests/kvm/lib/x86_64/vmx.c149
1 files changed, 93 insertions, 56 deletions
diff --git a/tools/testing/selftests/kvm/lib/x86_64/vmx.c b/tools/testing/selftests/kvm/lib/x86_64/vmx.c
index d089d8b850b5..b77a01d0a271 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/vmx.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/vmx.c
@@ -198,6 +198,16 @@ bool load_vmcs(struct vmx_pages *vmx)
return true;
}
+static bool ept_vpid_cap_supported(uint64_t mask)
+{
+ return rdmsr(MSR_IA32_VMX_EPT_VPID_CAP) & mask;
+}
+
+bool ept_1g_pages_supported(void)
+{
+ return ept_vpid_cap_supported(VMX_EPT_VPID_CAP_1G_PAGES);
+}
+
/*
* Initialize the control fields to the most basic settings possible.
*/
@@ -215,7 +225,7 @@ static inline void init_vmcs_control_fields(struct vmx_pages *vmx)
struct eptPageTablePointer eptp = {
.memory_type = VMX_BASIC_MEM_TYPE_WB,
.page_walk_length = 3, /* + 1 */
- .ad_enabled = !!(rdmsr(MSR_IA32_VMX_EPT_VPID_CAP) & VMX_EPT_VPID_CAP_AD_BITS),
+ .ad_enabled = ept_vpid_cap_supported(VMX_EPT_VPID_CAP_AD_BITS),
.address = vmx->eptp_gpa >> PAGE_SHIFT_4K,
};
@@ -392,80 +402,93 @@ void nested_vmx_check_supported(void)
}
}
-void nested_pg_map(struct vmx_pages *vmx, struct kvm_vm *vm,
- uint64_t nested_paddr, uint64_t paddr)
+static void nested_create_pte(struct kvm_vm *vm,
+ struct eptPageTableEntry *pte,
+ uint64_t nested_paddr,
+ uint64_t paddr,
+ int current_level,
+ int target_level)
+{
+ if (!pte->readable) {
+ pte->writable = true;
+ pte->readable = true;
+ pte->executable = true;
+ pte->page_size = (current_level == target_level);
+ if (pte->page_size)
+ pte->address = paddr >> vm->page_shift;
+ else
+ pte->address = vm_alloc_page_table(vm) >> vm->page_shift;
+ } else {
+ /*
+ * Entry already present. Assert that the caller doesn't want
+ * a hugepage at this level, and that there isn't a hugepage at
+ * this level.
+ */
+ TEST_ASSERT(current_level != target_level,
+ "Cannot create hugepage at level: %u, nested_paddr: 0x%lx\n",
+ current_level, nested_paddr);
+ TEST_ASSERT(!pte->page_size,
+ "Cannot create page table at level: %u, nested_paddr: 0x%lx\n",
+ current_level, nested_paddr);
+ }
+}
+
+
+void __nested_pg_map(struct vmx_pages *vmx, struct kvm_vm *vm,
+ uint64_t nested_paddr, uint64_t paddr, int target_level)
{
- uint16_t index[4];
- struct eptPageTableEntry *pml4e;
+ const uint64_t page_size = PG_LEVEL_SIZE(target_level);
+ struct eptPageTableEntry *pt = vmx->eptp_hva, *pte;
+ uint16_t index;
TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use "
"unknown or unsupported guest mode, mode: 0x%x", vm->mode);
- TEST_ASSERT((nested_paddr % vm->page_size) == 0,
+ TEST_ASSERT((nested_paddr >> 48) == 0,
+ "Nested physical address 0x%lx requires 5-level paging",
+ nested_paddr);
+ TEST_ASSERT((nested_paddr % page_size) == 0,
"Nested physical address not on page boundary,\n"
- " nested_paddr: 0x%lx vm->page_size: 0x%x",
- nested_paddr, vm->page_size);
+ " nested_paddr: 0x%lx page_size: 0x%lx",
+ nested_paddr, page_size);
TEST_ASSERT((nested_paddr >> vm->page_shift) <= vm->max_gfn,
"Physical address beyond beyond maximum supported,\n"
" nested_paddr: 0x%lx vm->max_gfn: 0x%lx vm->page_size: 0x%x",
paddr, vm->max_gfn, vm->page_size);
- TEST_ASSERT((paddr % vm->page_size) == 0,
+ TEST_ASSERT((paddr % page_size) == 0,
"Physical address not on page boundary,\n"
- " paddr: 0x%lx vm->page_size: 0x%x",
- paddr, vm->page_size);
+ " paddr: 0x%lx page_size: 0x%lx",
+ paddr, page_size);
TEST_ASSERT((paddr >> vm->page_shift) <= vm->max_gfn,
"Physical address beyond beyond maximum supported,\n"
" paddr: 0x%lx vm->max_gfn: 0x%lx vm->page_size: 0x%x",
paddr, vm->max_gfn, vm->page_size);
- index[0] = (nested_paddr >> 12) & 0x1ffu;
- index[1] = (nested_paddr >> 21) & 0x1ffu;
- index[2] = (nested_paddr >> 30) & 0x1ffu;
- index[3] = (nested_paddr >> 39) & 0x1ffu;
-
- /* Allocate page directory pointer table if not present. */
- pml4e = vmx->eptp_hva;
- if (!pml4e[index[3]].readable) {
- pml4e[index[3]].address = vm_alloc_page_table(vm) >> vm->page_shift;
- pml4e[index[3]].writable = true;
- pml4e[index[3]].readable = true;
- pml4e[index[3]].executable = true;
- }
+ for (int level = PG_LEVEL_512G; level >= PG_LEVEL_4K; level--) {
+ index = (nested_paddr >> PG_LEVEL_SHIFT(level)) & 0x1ffu;
+ pte = &pt[index];
- /* Allocate page directory table if not present. */
- struct eptPageTableEntry *pdpe;
- pdpe = addr_gpa2hva(vm, pml4e[index[3]].address * vm->page_size);
- if (!pdpe[index[2]].readable) {
- pdpe[index[2]].address = vm_alloc_page_table(vm) >> vm->page_shift;
- pdpe[index[2]].writable = true;
- pdpe[index[2]].readable = true;
- pdpe[index[2]].executable = true;
- }
+ nested_create_pte(vm, pte, nested_paddr, paddr, level, target_level);
- /* Allocate page table if not present. */
- struct eptPageTableEntry *pde;
- pde = addr_gpa2hva(vm, pdpe[index[2]].address * vm->page_size);
- if (!pde[index[1]].readable) {
- pde[index[1]].address = vm_alloc_page_table(vm) >> vm->page_shift;
- pde[index[1]].writable = true;
- pde[index[1]].readable = true;
- pde[index[1]].executable = true;
- }
+ if (pte->page_size)
+ break;
- /* Fill in page table entry. */
- struct eptPageTableEntry *pte;
- pte = addr_gpa2hva(vm, pde[index[1]].address * vm->page_size);
- pte[index[0]].address = paddr >> vm->page_shift;
- pte[index[0]].writable = true;
- pte[index[0]].readable = true;
- pte[index[0]].executable = true;
+ pt = addr_gpa2hva(vm, pte->address * vm->page_size);
+ }
/*
* For now mark these as accessed and dirty because the only
* testcase we have needs that. Can be reconsidered later.
*/
- pte[index[0]].accessed = true;
- pte[index[0]].dirty = true;
+ pte->accessed = true;
+ pte->dirty = true;
+
+}
+
+void nested_pg_map(struct vmx_pages *vmx, struct kvm_vm *vm,
+ uint64_t nested_paddr, uint64_t paddr)
+{
+ __nested_pg_map(vmx, vm, nested_paddr, paddr, PG_LEVEL_4K);
}
/*
@@ -476,7 +499,7 @@ void nested_pg_map(struct vmx_pages *vmx, struct kvm_vm *vm,
* nested_paddr - Nested guest physical address to map
* paddr - VM Physical Address
* size - The size of the range to map
- * eptp_memslot - Memory region slot for new virtual translation tables
+ * level - The level at which to map the range
*
* Output Args: None
*
@@ -485,22 +508,29 @@ void nested_pg_map(struct vmx_pages *vmx, struct kvm_vm *vm,
* Within the VM given by vm, creates a nested guest translation for the
* page range starting at nested_paddr to the page range starting at paddr.
*/
-void nested_map(struct vmx_pages *vmx, struct kvm_vm *vm,
- uint64_t nested_paddr, uint64_t paddr, uint64_t size)
+void __nested_map(struct vmx_pages *vmx, struct kvm_vm *vm,
+ uint64_t nested_paddr, uint64_t paddr, uint64_t size,
+ int level)
{
- size_t page_size = vm->page_size;
+ size_t page_size = PG_LEVEL_SIZE(level);
size_t npages = size / page_size;
TEST_ASSERT(nested_paddr + size > nested_paddr, "Vaddr overflow");
TEST_ASSERT(paddr + size > paddr, "Paddr overflow");
while (npages--) {
- nested_pg_map(vmx, vm, nested_paddr, paddr);
+ __nested_pg_map(vmx, vm, nested_paddr, paddr, level);
nested_paddr += page_size;
paddr += page_size;
}
}
+void nested_map(struct vmx_pages *vmx, struct kvm_vm *vm,
+ uint64_t nested_paddr, uint64_t paddr, uint64_t size)
+{
+ __nested_map(vmx, vm, nested_paddr, paddr, size, PG_LEVEL_4K);
+}
+
/* Prepare an identity extended page table that maps all the
* physical pages in VM.
*/
@@ -525,6 +555,13 @@ void nested_map_memslot(struct vmx_pages *vmx, struct kvm_vm *vm,
}
}
+/* Identity map a region with 1GiB Pages. */
+void nested_identity_map_1g(struct vmx_pages *vmx, struct kvm_vm *vm,
+ uint64_t addr, uint64_t size)
+{
+ __nested_map(vmx, vm, addr, addr, size, PG_LEVEL_1G);
+}
+
void prepare_eptp(struct vmx_pages *vmx, struct kvm_vm *vm,
uint32_t eptp_memslot)
{
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 03:46:33 +0000