Re: [PATCH v2 08/10] KVM: selftests: create alias mappings when using shared memory

From: Paolo Bonzini
Date: Wed May 26 2021 - 14:32:00 EST

On 26/05/21 19:22, Axel Rasmussen wrote:
I applied this change on top of kvm/master and tested it, and indeed
it compiles and works correctly.

Paolo, feel free to take this with a:

Reviewed-by: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>

Or alternatively if you prefer I'm happy to send it as a real
git-send-email patch.

Yes, I squashed it.

Paolo

On Tue, May 25, 2021 at 4:50 PM David Matlack <dmatlack@xxxxxxxxxx> wrote:

On Wed, May 19, 2021 at 1:04 PM Axel Rasmussen <axelrasmussen@xxxxxxxxxx> wrote:

When a memory region is added with a src_type specifying that it should
use some kind of shared memory, also create an alias mapping to the same
underlying physical pages.

And, add an API so tests can get access to these alias addresses.
Basically, for a guest physical address, let us look up the analogous
host *alias* address.

In a future commit, we'll modify the demand paging test to take
advantage of this to exercise UFFD minor faults. The idea is, we
pre-fault the underlying pages *via the alias*. When the *guest*
faults, it gets a "minor" fault (PTEs don't exist yet, but a page is
already in the page cache). Then, the userfaultfd theads can handle the
fault: they could potentially modify the underlying memory *via the
alias* if they wanted to, and then they install the PTEs and let the
guest carry on via a UFFDIO_CONTINUE ioctl.

Reviewed-by: Ben Gardon <bgardon@xxxxxxxxxx>
Signed-off-by: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
---
.../testing/selftests/kvm/include/kvm_util.h | 1 +
tools/testing/selftests/kvm/lib/kvm_util.c | 51 +++++++++++++++++++
.../selftests/kvm/lib/kvm_util_internal.h | 2 +
3 files changed, 54 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index a8f022794ce3..0624f25a6803 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -146,6 +146,7 @@ void virt_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
void *addr_gpa2hva(struct kvm_vm *vm, vm_paddr_t gpa);
void *addr_gva2hva(struct kvm_vm *vm, vm_vaddr_t gva);
vm_paddr_t addr_hva2gpa(struct kvm_vm *vm, void *hva);
+void *addr_gpa2alias(struct kvm_vm *vm, vm_paddr_t gpa);

/*
* Address Guest Virtual to Guest Physical
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index e4a8d0c43c5e..0b88d1bbc1e0 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -811,6 +811,19 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm,

/* Add to linked-list of memory regions. */
list_add(&region->list, &vm->userspace_mem_regions);
+
+ /* If shared memory, create an alias. */
+ if (region->fd >= 0) {
+ region->mmap_alias = mmap(NULL, region->mmap_size,
+ PROT_READ | PROT_WRITE,
+ vm_mem_backing_src_alias(src_type)->flag,
+ region->fd, 0);
+ TEST_ASSERT(region->mmap_alias != MAP_FAILED,
+ "mmap of alias failed, errno: %i", errno);
+
+ /* Align host alias address */
+ region->host_alias = align(region->mmap_alias, alignment);
+ }
}

/*
@@ -1239,6 +1252,44 @@ vm_paddr_t addr_hva2gpa(struct kvm_vm *vm, void *hva)
return -1;
}

+/*
+ * Address VM physical to Host Virtual *alias*.
+ *
+ * Input Args:
+ * vm - Virtual Machine
+ * gpa - VM physical address
+ *
+ * Output Args: None
+ *
+ * Return:
+ * Equivalent address within the host virtual *alias* area, or NULL
+ * (without failing the test) if the guest memory is not shared (so
+ * no alias exists).
+ *
+ * When vm_create() and related functions are called with a shared memory
+ * src_type, we also create a writable, shared alias mapping of the
+ * underlying guest memory. This allows the host to manipulate guest memory
+ * without mapping that memory in the guest's address space. And, for
+ * userfaultfd-based demand paging, we can do so without triggering userfaults.
+ */
+void *addr_gpa2alias(struct kvm_vm *vm, vm_paddr_t gpa)
+{
+ struct userspace_mem_region *region;
+
+ list_for_each_entry(region, &vm->userspace_mem_regions, list) {

This patch fails to compile on top of with db0670ce3361 ("KVM:
selftests: Keep track of memslots more efficiently").

This can be reproduced by checking out kvm/master and running `make -C
tools/testing/selftests/kvm`.

The following diff fixes the compilation error but I did not have time
to test it yet:

diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c
b/tools/testing/selftests/kvm/lib/kvm_util.c
index c98db1846e1b..28e528c19d28 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -1374,19 +1374,17 @@ vm_paddr_t addr_hva2gpa(struct kvm_vm *vm, void *hva)
void *addr_gpa2alias(struct kvm_vm *vm, vm_paddr_t gpa)
{
struct userspace_mem_region *region;
+ uintptr_t offset;

- list_for_each_entry(region, &vm->userspace_mem_regions, list) {
- if (!region->host_alias)
- continue;
+ region = userspace_mem_region_find(vm, gpa, gpa);
+ if (!region)
+ return NULL;

- if ((gpa >= region->region.guest_phys_addr)
- && (gpa <= (region->region.guest_phys_addr
- + region->region.memory_size - 1)))
- return (void *) ((uintptr_t) region->host_alias
- + (gpa - region->region.guest_phys_addr));
- }
+ if (!region->host_alias)
+ return NULL;

- return NULL;
+ offset = gpa - region->region.guest_phys_addr;
+ return (void *) ((uintptr_t) region->host_alias + offset);
}

/*



+ if (!region->host_alias)
+ continue;
+
+ if ((gpa >= region->region.guest_phys_addr)
+ && (gpa <= (region->region.guest_phys_addr
+ + region->region.memory_size - 1)))
+ return (void *) ((uintptr_t) region->host_alias
+ + (gpa - region->region.guest_phys_addr));
+ }
+
+ return NULL;
+}
+
/*
* VM Create IRQ Chip
*
diff --git a/tools/testing/selftests/kvm/lib/kvm_util_internal.h b/tools/testing/selftests/kvm/lib/kvm_util_internal.h
index 91ce1b5d480b..a25af33d4a9c 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util_internal.h
+++ b/tools/testing/selftests/kvm/lib/kvm_util_internal.h
@@ -16,7 +16,9 @@ struct userspace_mem_region {
int fd;
off_t offset;
void *host_mem;
+ void *host_alias;
void *mmap_start;
+ void *mmap_alias;
size_t mmap_size;
struct list_head list;
};
--
2.31.1.751.gd2f1c929bd-goog