This series implements selftests targeting the feature floated by Chao
via:
https://lore.kernel.org/linux-mm/[email protected]/T/
Below changes aim to test the fd based approach for guest private memory
in context of normal (non-confidential) VMs executing on non-confidential
platforms.
private_mem_test.c file adds selftest to access private memory from the
guest via private/shared accesses and checking if the contents can be
leaked to/accessed by vmm via shared memory view before/after conversions.
Updates in V1 (Compared to RFC v3 patches):
1) Incorporated suggestions from Sean around simplifying KVM changes
2) Addressed comments from Sean
3) Added private mem test with shared memory backed by 2MB hugepages.
RFC v3 series:
https://lore.kernel.org/lkml/[email protected]/t/
This series has dependency on following patches:
1) V9 series patches from Chao mentioned above.
Github link for the patches posted as part of this series:
https://github.com/vishals4gh/linux/commits/priv_memfd_selftests-v1
Vishal Annapurve (6):
KVM: x86: Add support for testing private memory
KVM: Selftests: Add support for private memory
KVM: selftests: x86: Add IS_ALIGNED/IS_PAGE_ALIGNED helpers
KVM: selftests: x86: Execute VMs with private memory
KVM: selftests: Add get_free_huge_2m_pages
KVM: selftests: x86: Add selftest for private memory
arch/x86/kvm/mmu/mmu.c | 4 +
arch/x86/kvm/mmu/mmu_internal.h | 4 +-
tools/testing/selftests/kvm/.gitignore | 1 +
tools/testing/selftests/kvm/Makefile | 2 +
.../selftests/kvm/include/kvm_util_base.h | 15 +-
.../testing/selftests/kvm/include/test_util.h | 5 +
.../kvm/include/x86_64/private_mem.h | 37 +++
.../selftests/kvm/include/x86_64/processor.h | 1 +
tools/testing/selftests/kvm/lib/kvm_util.c | 58 ++++-
tools/testing/selftests/kvm/lib/test_util.c | 30 +++
.../selftests/kvm/lib/x86_64/private_mem.c | 211 ++++++++++++++++++
.../selftests/kvm/x86_64/private_mem_test.c | 190 ++++++++++++++++
virt/kvm/Kconfig | 4 +
virt/kvm/kvm_main.c | 2 +-
14 files changed, 555 insertions(+), 9 deletions(-)
create mode 100644 tools/testing/selftests/kvm/include/x86_64/private_mem.h
create mode 100644 tools/testing/selftests/kvm/lib/x86_64/private_mem.c
create mode 100644 tools/testing/selftests/kvm/x86_64/private_mem_test.c
--
2.38.1.431.g37b22c650d-goog
Add an API to query free 2MB hugepages in the system.
Signed-off-by: Vishal Annapurve <[email protected]>
---
.../testing/selftests/kvm/include/test_util.h | 1 +
tools/testing/selftests/kvm/lib/test_util.c | 18 ++++++++++++++++++
2 files changed, 19 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h
index 140a61f68fe5..f4df49c8b5ba 100644
--- a/tools/testing/selftests/kvm/include/test_util.h
+++ b/tools/testing/selftests/kvm/include/test_util.h
@@ -115,6 +115,7 @@ struct vm_mem_backing_src_alias {
bool thp_configured(void);
size_t get_trans_hugepagesz(void);
size_t get_def_hugetlb_pagesz(void);
+size_t get_free_huge_2mb_pages(void);
const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i);
size_t get_backing_src_pagesz(uint32_t i);
bool is_backing_src_hugetlb(uint32_t i);
diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c
index ebbac8246016..4f28ae73f150 100644
--- a/tools/testing/selftests/kvm/lib/test_util.c
+++ b/tools/testing/selftests/kvm/lib/test_util.c
@@ -145,6 +145,24 @@ size_t get_trans_hugepagesz(void)
return size;
}
+size_t get_free_huge_2mb_pages(void)
+{
+ size_t free_pages;
+ FILE *f;
+ int ret;
+
+ f = fopen("/sys/kernel/mm/hugepages/hugepages-2048kB/free_hugepages", "r");
+ TEST_ASSERT(f != NULL, "Error in opening hugepages-2048kB/free_hugepages");
+
+ do {
+ ret = fscanf(f, "%ld", &free_pages);
+ } while (errno == EINTR);
+ TEST_ASSERT(ret < 1, "Error reading hugepages-2048kB/free_hugepages");
+ fclose(f);
+
+ return free_pages;
+}
+
size_t get_def_hugetlb_pagesz(void)
{
char buf[64];
--
2.38.1.431.g37b22c650d-goog