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Date: Wed, 30 Mar 2022 10:46:14 -0700
From: Ben Gardon <bgardon@...gle.com>
To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: Paolo Bonzini <pbonzini@...hat.com>, Peter Xu <peterx@...hat.com>,
Sean Christopherson <seanjc@...gle.com>,
David Matlack <dmatlack@...gle.com>,
Jim Mattson <jmattson@...gle.com>,
David Dunn <daviddunn@...gle.com>,
Jing Zhang <jingzhangos@...gle.com>,
Junaid Shahid <junaids@...gle.com>,
Ben Gardon <bgardon@...gle.com>
Subject: [PATCH v3 04/11] KVM: selftests: Add memslot parameter to elf_load
Currently elf_load loads code into memslot 0. Add a parameter to allow
loading code into any memslot. This will be useful for backing code
pages with huge pages in future commits.
No functional change intended.
Signed-off-by: Ben Gardon <bgardon@...gle.com>
---
.../testing/selftests/kvm/include/kvm_util_base.h | 5 +++++
tools/testing/selftests/kvm/lib/elf.c | 13 +++++++++++--
tools/testing/selftests/kvm/lib/kvm_util.c | 14 ++++++++++----
3 files changed, 26 insertions(+), 6 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index 78c4407f36b4..72163ba2f878 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -122,7 +122,10 @@ uint32_t kvm_vm_reset_dirty_ring(struct kvm_vm *vm);
int kvm_memcmp_hva_gva(void *hva, struct kvm_vm *vm, const vm_vaddr_t gva,
size_t len);
+void kvm_vm_elf_load_memslot(struct kvm_vm *vm, const char *filename,
+ uint32_t memslot);
void kvm_vm_elf_load(struct kvm_vm *vm, const char *filename);
+
int kvm_memfd_alloc(size_t size, bool hugepages);
void vm_dump(FILE *stream, struct kvm_vm *vm, uint8_t indent);
@@ -169,6 +172,8 @@ void vm_mem_region_set_flags(struct kvm_vm *vm, uint32_t slot, uint32_t flags);
void vm_mem_region_move(struct kvm_vm *vm, uint32_t slot, uint64_t new_gpa);
void vm_mem_region_delete(struct kvm_vm *vm, uint32_t slot);
void vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid);
+vm_vaddr_t vm_vaddr_alloc_memslot(struct kvm_vm *vm, size_t sz,
+ vm_vaddr_t vaddr_min, uint32_t memslot);
vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min);
vm_vaddr_t vm_vaddr_alloc_pages(struct kvm_vm *vm, int nr_pages);
vm_vaddr_t vm_vaddr_alloc_page(struct kvm_vm *vm);
diff --git a/tools/testing/selftests/kvm/lib/elf.c b/tools/testing/selftests/kvm/lib/elf.c
index 13e8e3dcf984..899418e65f60 100644
--- a/tools/testing/selftests/kvm/lib/elf.c
+++ b/tools/testing/selftests/kvm/lib/elf.c
@@ -97,6 +97,7 @@ static void elfhdr_get(const char *filename, Elf64_Ehdr *hdrp)
*
* Input Args:
* filename - Path to ELF file
+ * memslot - the memslot into which the elf should be loaded
*
* Output Args: None
*
@@ -111,7 +112,8 @@ static void elfhdr_get(const char *filename, Elf64_Ehdr *hdrp)
* by the image and it needs to have sufficient available physical pages, to
* back the virtual pages used to load the image.
*/
-void kvm_vm_elf_load(struct kvm_vm *vm, const char *filename)
+void kvm_vm_elf_load_memslot(struct kvm_vm *vm, const char *filename,
+ uint32_t memslot)
{
off_t offset, offset_rv;
Elf64_Ehdr hdr;
@@ -162,7 +164,9 @@ void kvm_vm_elf_load(struct kvm_vm *vm, const char *filename)
seg_vend |= vm->page_size - 1;
size_t seg_size = seg_vend - seg_vstart + 1;
- vm_vaddr_t vaddr = vm_vaddr_alloc(vm, seg_size, seg_vstart);
+ vm_vaddr_t vaddr = vm_vaddr_alloc_memslot(vm, seg_size,
+ seg_vstart,
+ memslot);
TEST_ASSERT(vaddr == seg_vstart, "Unable to allocate "
"virtual memory for segment at requested min addr,\n"
" segment idx: %u\n"
@@ -191,3 +195,8 @@ void kvm_vm_elf_load(struct kvm_vm *vm, const char *filename)
}
}
}
+
+void kvm_vm_elf_load(struct kvm_vm *vm, const char *filename)
+{
+ kvm_vm_elf_load_memslot(vm, filename, 0);
+}
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 9c4574381daa..09742a787546 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -1336,8 +1336,7 @@ static vm_vaddr_t vm_vaddr_unused_gap(struct kvm_vm *vm, size_t sz,
* vm - Virtual Machine
* sz - Size in bytes
* vaddr_min - Minimum starting virtual address
- * data_memslot - Memory region slot for data pages
- * pgd_memslot - Memory region slot for new virtual translation tables
+ * memslot - Memory region slot for data pages
*
* Output Args: None
*
@@ -1350,13 +1349,15 @@ static vm_vaddr_t vm_vaddr_unused_gap(struct kvm_vm *vm, size_t sz,
* a unique set of pages, with the minimum real allocation being at least
* a page.
*/
-vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min)
+vm_vaddr_t vm_vaddr_alloc_memslot(struct kvm_vm *vm, size_t sz,
+ vm_vaddr_t vaddr_min, uint32_t memslot)
{
uint64_t pages = (sz >> vm->page_shift) + ((sz % vm->page_size) != 0);
virt_pgd_alloc(vm);
vm_paddr_t paddr = vm_phy_pages_alloc(vm, pages,
- KVM_UTIL_MIN_PFN * vm->page_size, 0);
+ KVM_UTIL_MIN_PFN * vm->page_size,
+ memslot);
/*
* Find an unused range of virtual page addresses of at least
@@ -1377,6 +1378,11 @@ vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min)
return vaddr_start;
}
+vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min)
+{
+ return vm_vaddr_alloc_memslot(vm, sz, vaddr_min, 0);
+}
+
/*
* VM Virtual Address Allocate Pages
*
--
2.35.1.1021.g381101b075-goog
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