All of lore.kernel.org
 help / color / mirror / Atom feed
From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	Janosch Frank <frankja@linux.ibm.com>
Cc: David Hildenbrand <david@redhat.com>,
	Cornelia Huck <cohuck@redhat.com>,
	Claudio Imbrenda <imbrenda@linux.ibm.com>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	Peter Xu <peterx@redhat.com>,
	Sean Christopherson <seanjc@google.com>,
	Peter Shier <pshier@google.com>
Subject: [PATCH 17/19] KVM: selftests: Genericize upper level page table entry struct
Date: Tue, 22 Jun 2021 13:05:27 -0700	[thread overview]
Message-ID: <20210622200529.3650424-18-seanjc@google.com> (raw)
In-Reply-To: <20210622200529.3650424-1-seanjc@google.com>

In preparation for adding hugepage support, replace "pageMapL4Entry",
"pageDirectoryPointerEntry", and "pageDirectoryEntry" with a common
"pageUpperEntry", and add a helper to create an upper level entry. All
upper level entries have the same layout, using unique structs provides
minimal value and requires a non-trivial amount of code duplication.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 .../selftests/kvm/lib/x86_64/processor.c      | 91 ++++++-------------
 1 file changed, 26 insertions(+), 65 deletions(-)

diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index cd111093f018..cc2483db47a9 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -20,37 +20,7 @@
 vm_vaddr_t exception_handlers;
 
 /* Virtual translation table structure declarations */
-struct pageMapL4Entry {
-	uint64_t present:1;
-	uint64_t writable:1;
-	uint64_t user:1;
-	uint64_t write_through:1;
-	uint64_t cache_disable:1;
-	uint64_t accessed:1;
-	uint64_t ignored_06:1;
-	uint64_t page_size:1;
-	uint64_t ignored_11_08:4;
-	uint64_t pfn:40;
-	uint64_t ignored_62_52:11;
-	uint64_t execute_disable:1;
-};
-
-struct pageDirectoryPointerEntry {
-	uint64_t present:1;
-	uint64_t writable:1;
-	uint64_t user:1;
-	uint64_t write_through:1;
-	uint64_t cache_disable:1;
-	uint64_t accessed:1;
-	uint64_t ignored_06:1;
-	uint64_t page_size:1;
-	uint64_t ignored_11_08:4;
-	uint64_t pfn:40;
-	uint64_t ignored_62_52:11;
-	uint64_t execute_disable:1;
-};
-
-struct pageDirectoryEntry {
+struct pageUpperEntry {
 	uint64_t present:1;
 	uint64_t writable:1;
 	uint64_t user:1;
@@ -225,11 +195,24 @@ static void *virt_get_pte(struct kvm_vm *vm, uint64_t pt_pfn, uint64_t vaddr,
 	return &page_table[index];
 }
 
+static struct pageUpperEntry *virt_create_upper_pte(struct kvm_vm *vm,
+						    uint64_t pt_pfn,
+						    uint64_t vaddr,
+						    int level)
+{
+	struct pageUpperEntry *pte = virt_get_pte(vm, pt_pfn, vaddr, level);
+
+	if (!pte->present) {
+		pte->pfn = vm_alloc_page_table(vm) >> vm->page_shift;
+		pte->writable = true;
+		pte->present = true;
+	}
+	return pte;
+}
+
 void virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr)
 {
-	struct pageMapL4Entry *pml4e;
-	struct pageDirectoryPointerEntry *pdpe;
-	struct pageDirectoryEntry *pde;
+	struct pageUpperEntry *pml4e, *pdpe, *pde;
 	struct pageTableEntry *pte;
 
 	TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use "
@@ -252,29 +235,10 @@ void virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr)
 		"  paddr: 0x%lx vm->max_gfn: 0x%lx vm->page_size: 0x%x",
 		paddr, vm->max_gfn, vm->page_size);
 
-	/* Allocate page directory pointer table if not present. */
-	pml4e = virt_get_pte(vm, vm->pgd >> vm->page_shift, vaddr, 3);
-	if (!pml4e->present) {
-		pml4e->pfn = vm_alloc_page_table(vm) >> vm->page_shift;
-		pml4e->writable = true;
-		pml4e->present = true;
-	}
-
-	/* Allocate page directory table if not present. */
-	pdpe = virt_get_pte(vm, pml4e->pfn, vaddr, 2);
-	if (!pdpe->present) {
-		pdpe->pfn = vm_alloc_page_table(vm) >> vm->page_shift;
-		pdpe->writable = true;
-		pdpe->present = true;
-	}
-
-	/* Allocate page table if not present. */
-	pde = virt_get_pte(vm, pdpe->pfn, vaddr, 1);
-	if (!pde->present) {
-		pde->pfn = vm_alloc_page_table(vm) >> vm->page_shift;
-		pde->writable = true;
-		pde->present = true;
-	}
+	/* Allocate upper level page tables, if not already present. */
+	pml4e = virt_create_upper_pte(vm, vm->pgd >> vm->page_shift, vaddr, 3);
+	pdpe = virt_create_upper_pte(vm, pml4e->pfn, vaddr, 2);
+	pde = virt_create_upper_pte(vm, pdpe->pfn, vaddr, 1);
 
 	/* Fill in page table entry. */
 	pte = virt_get_pte(vm, pde->pfn, vaddr, 0);
@@ -285,9 +249,9 @@ void virt_pg_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr)
 
 void virt_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)
 {
-	struct pageMapL4Entry *pml4e, *pml4e_start;
-	struct pageDirectoryPointerEntry *pdpe, *pdpe_start;
-	struct pageDirectoryEntry *pde, *pde_start;
+	struct pageUpperEntry *pml4e, *pml4e_start;
+	struct pageUpperEntry *pdpe, *pdpe_start;
+	struct pageUpperEntry *pde, *pde_start;
 	struct pageTableEntry *pte, *pte_start;
 
 	if (!vm->pgd_created)
@@ -298,8 +262,7 @@ void virt_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent)
 	fprintf(stream, "%*s      index hvaddr         gpaddr         "
 		"addr         w exec dirty\n",
 		indent, "");
-	pml4e_start = (struct pageMapL4Entry *) addr_gpa2hva(vm,
-		vm->pgd);
+	pml4e_start = (struct pageUpperEntry *) addr_gpa2hva(vm, vm->pgd);
 	for (uint16_t n1 = 0; n1 <= 0x1ffu; n1++) {
 		pml4e = &pml4e_start[n1];
 		if (!pml4e->present)
@@ -468,9 +431,7 @@ static void kvm_seg_set_kernel_data_64bit(struct kvm_vm *vm, uint16_t selector,
 vm_paddr_t addr_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva)
 {
 	uint16_t index[4];
-	struct pageMapL4Entry *pml4e;
-	struct pageDirectoryPointerEntry *pdpe;
-	struct pageDirectoryEntry *pde;
+	struct pageUpperEntry *pml4e, *pdpe, *pde;
 	struct pageTableEntry *pte;
 
 	TEST_ASSERT(vm->mode == VM_MODE_PXXV48_4K, "Attempt to use "
-- 
2.32.0.288.g62a8d224e6-goog


  parent reply	other threads:[~2021-06-22 20:07 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-22 20:05 [PATCH 00/19] KVM: selftests: Add x86 mmu_role test and cleanups Sean Christopherson
2021-06-22 20:05 ` [PATCH 01/19] KVM: selftests: Remove errant asm/barrier.h include to fix arm64 build Sean Christopherson
2021-06-22 20:05 ` [PATCH 02/19] KVM: selftests: Zero out the correct page in the Hyper-V features test Sean Christopherson
2021-06-22 20:05 ` [PATCH 03/19] KVM: selftests: Unconditionally use memslot 0 when loading elf binary Sean Christopherson
2021-06-22 20:05 ` [PATCH 04/19] KVM: selftests: Unconditionally use memslot 0 for x86's GDT/TSS setup Sean Christopherson
2021-06-22 20:05 ` [PATCH 05/19] KVM: selftests: Use "standard" min virtual address for Hyper-V pages Sean Christopherson
2021-06-22 20:05 ` [PATCH 06/19] KVM: selftests: Add helpers to allocate N pages of virtual memory Sean Christopherson
2021-06-22 20:05 ` [PATCH 07/19] KVM: selftests: Lower the min virtual address for misc page allocations Sean Christopherson
2021-06-22 20:05 ` [PATCH 08/19] KVM: selftests: Use alloc_page helper for x86-64's GDT/ITD/TSS allocations Sean Christopherson
2021-06-22 20:05 ` [PATCH 09/19] KVM: selftests: Use alloc page helper for xAPIC IPI test Sean Christopherson
2021-06-22 20:05 ` [PATCH 10/19] KVM: selftests: Use "standard" min virtual address for CPUID test alloc Sean Christopherson
2021-06-22 20:05 ` [PATCH 11/19] KVM: selftest: Unconditionally use memslot 0 for vaddr allocations Sean Christopherson
2021-06-22 20:05 ` [PATCH 12/19] KVM: selftests: Unconditionally use memslot '0' for page table allocations Sean Christopherson
2021-06-22 20:05 ` [PATCH 13/19] KVM: selftests: Unconditionally allocate EPT tables in memslot 0 Sean Christopherson
2021-06-22 20:05 ` [PATCH 14/19] KVM: selftests: Add wrapper to allocate page table page Sean Christopherson
2021-06-22 20:05 ` [PATCH 15/19] KVM: selftests: Rename x86's page table "address" to "pfn" Sean Christopherson
2021-06-22 20:05 ` [PATCH 16/19] KVM: selfests: Add PTE helper for x86-64 in preparation for hugepages Sean Christopherson
2021-06-22 20:05 ` Sean Christopherson [this message]
2021-06-22 20:05 ` [PATCH 18/19] KVM: selftests: Add hugepage support for x86-64 Sean Christopherson
2021-06-22 20:05 ` [PATCH 19/19] KVM: sefltests: Add x86-64 test to verify MMU reacts to CPUID updates Sean Christopherson
2022-03-02  7:45   ` Like Xu
2021-06-23 13:07 ` [PATCH 00/19] KVM: selftests: Add x86 mmu_role test and cleanups Paolo Bonzini

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210622200529.3650424-18-seanjc@google.com \
    --to=seanjc@google.com \
    --cc=borntraeger@de.ibm.com \
    --cc=cohuck@redhat.com \
    --cc=david@redhat.com \
    --cc=frankja@linux.ibm.com \
    --cc=imbrenda@linux.ibm.com \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=pbonzini@redhat.com \
    --cc=peterx@redhat.com \
    --cc=pshier@google.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.