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Message-Id: <20220819174659.2427983-3-vannapurve@google.com>
Date: Fri, 19 Aug 2022 17:46:55 +0000
From: Vishal Annapurve <vannapurve@...gle.com>
To: x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org
Cc: pbonzini@...hat.com, vkuznets@...hat.com, wanpengli@...cent.com,
jmattson@...gle.com, joro@...tes.org, tglx@...utronix.de,
mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
hpa@...or.com, shuah@...nel.org, yang.zhong@...el.com,
drjones@...hat.com, ricarkol@...gle.com, aaronlewis@...gle.com,
wei.w.wang@...el.com, kirill.shutemov@...ux.intel.com,
corbet@....net, hughd@...gle.com, jlayton@...nel.org,
bfields@...ldses.org, akpm@...ux-foundation.org,
chao.p.peng@...ux.intel.com, yu.c.zhang@...ux.intel.com,
jun.nakajima@...el.com, dave.hansen@...el.com,
michael.roth@....com, qperret@...gle.com, steven.price@....com,
ak@...ux.intel.com, david@...hat.com, luto@...nel.org,
vbabka@...e.cz, marcorr@...gle.com, erdemaktas@...gle.com,
pgonda@...gle.com, nikunj@....com, seanjc@...gle.com,
diviness@...gle.com, maz@...nel.org, dmatlack@...gle.com,
axelrasmussen@...gle.com, maciej.szmigiero@...cle.com,
mizhang@...gle.com, bgardon@...gle.com,
Vishal Annapurve <vannapurve@...gle.com>
Subject: [RFC V3 PATCH 2/6] selftests: kvm: Add support for private memory
Add support for registering private memory with kvm using
KVM_SET_USER_MEMORY_REGION ioctl.
Helper function to query extended userspace mem region is introduced to
allow memory conversion.
Signed-off-by: Vishal Annapurve <vannapurve@...gle.com>
---
.../selftests/kvm/include/kvm_util_base.h | 12 +++++-
tools/testing/selftests/kvm/lib/kvm_util.c | 40 ++++++++++++++++++-
2 files changed, 49 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index ff2533a32af9..dfe454f228e7 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -30,7 +30,10 @@ typedef uint64_t vm_paddr_t; /* Virtual Machine (Guest) physical address */
typedef uint64_t vm_vaddr_t; /* Virtual Machine (Guest) virtual address */
struct userspace_mem_region {
- struct kvm_userspace_memory_region region;
+ union {
+ struct kvm_userspace_memory_region region;
+ struct kvm_userspace_memory_region_ext region_ext;
+ };
struct sparsebit *unused_phy_pages;
struct sparsebit *encrypted_phy_pages;
int fd;
@@ -200,7 +203,7 @@ static inline bool kvm_has_cap(long cap)
#define kvm_do_ioctl(fd, cmd, arg) \
({ \
- static_assert(!_IOC_SIZE(cmd) || sizeof(*arg) == _IOC_SIZE(cmd), ""); \
+ static_assert(!_IOC_SIZE(cmd) || sizeof(*arg) >= _IOC_SIZE(cmd), ""); \
ioctl(fd, cmd, arg); \
})
@@ -388,6 +391,7 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm,
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);
+
struct kvm_vcpu *__vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpu_id);
vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min);
vm_vaddr_t vm_vaddr_alloc_shared(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min);
@@ -717,6 +721,10 @@ struct kvm_userspace_memory_region *
kvm_userspace_memory_region_find(struct kvm_vm *vm, uint64_t start,
uint64_t end);
+struct kvm_userspace_memory_region_ext *
+kvm_userspace_memory_region_ext_find(struct kvm_vm *vm, uint64_t start,
+ uint64_t end);
+
#define sync_global_to_guest(vm, g) ({ \
typeof(g) *_p = addr_gva2hva(vm, (vm_vaddr_t)&(g)); \
memcpy(_p, &(g), sizeof(g)); \
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 171bc20a097a..f153c71d6988 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -17,6 +17,7 @@
#include <unistd.h>
#include <linux/kernel.h>
+#define MFD_INACCESSIBLE 0x0008U
#define KVM_UTIL_MIN_PFN 2
static int vcpu_mmap_sz(void);
@@ -466,6 +467,35 @@ kvm_userspace_memory_region_find(struct kvm_vm *vm, uint64_t start,
return ®ion->region;
}
+/*
+ * KVM Userspace Memory Region Ext Find
+ *
+ * Input Args:
+ * vm - Virtual Machine
+ * start - Starting VM physical address
+ * end - Ending VM physical address, inclusive.
+ *
+ * Output Args: None
+ *
+ * Return:
+ * Pointer to overlapping ext region, NULL if no such region.
+ *
+ * Public interface to userspace_mem_region_find. Allows tests to look up
+ * the memslot datastructure for a given range of guest physical memory.
+ */
+struct kvm_userspace_memory_region_ext *
+kvm_userspace_memory_region_ext_find(struct kvm_vm *vm, uint64_t start,
+ uint64_t end)
+{
+ struct userspace_mem_region *region;
+
+ region = userspace_mem_region_find(vm, start, end);
+ if (!region)
+ return NULL;
+
+ return ®ion->region_ext;
+}
+
/*
* VM VCPU Remove
*
@@ -764,6 +794,7 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm,
struct userspace_mem_region *region;
size_t backing_src_pagesz = get_backing_src_pagesz(src_type);
size_t alignment;
+ int priv_memfd = -1;
TEST_ASSERT(vm_adjust_num_guest_pages(vm->mode, npages) == npages,
"Number of guest pages is not compatible with the host. "
@@ -869,6 +900,11 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm,
vm_mem_backing_src_alias(src_type)->name);
}
+ if (flags & KVM_MEM_PRIVATE) {
+ priv_memfd = memfd_create("vm_private_mem_", MFD_INACCESSIBLE);
+ TEST_ASSERT(priv_memfd != -1, "Failed to create private memfd");
+ }
+
region->unused_phy_pages = sparsebit_alloc();
region->encrypted_phy_pages = sparsebit_alloc();
sparsebit_set_num(region->unused_phy_pages,
@@ -878,7 +914,9 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm,
region->region.guest_phys_addr = guest_paddr;
region->region.memory_size = npages * vm->page_size;
region->region.userspace_addr = (uintptr_t) region->host_mem;
- ret = __vm_ioctl(vm, KVM_SET_USER_MEMORY_REGION, ®ion->region);
+ region->region_ext.private_fd = priv_memfd;
+ region->region_ext.private_offset = 0;
+ ret = ioctl(vm->fd, KVM_SET_USER_MEMORY_REGION, ®ion->region_ext);
TEST_ASSERT(ret == 0, "KVM_SET_USER_MEMORY_REGION IOCTL failed,\n"
" rc: %i errno: %i\n"
" slot: %u flags: 0x%x\n"
--
2.37.1.595.g718a3a8f04-goog
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