| Message ID | 20190927161836.57978-8-bgardon@google.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Create a userfaultfd demand paging test | expand |
On Fri, Sep 27, 2019 at 09:18:35AM -0700, Ben Gardon wrote: > KVM creates internal memslots between 3 and 4 GiB paddrs on the first > vCPU creation. If memslot 0 is large enough it collides with these > memslots an causes vCPU creation to fail. Add a paddr parameter for > memslot 0 so that tests which support large VMs can relocate memslot 0 > above 4 GiB. > > Signed-off-by: Ben Gardon <bgardon@google.com> > --- > tools/testing/selftests/kvm/demand_paging_test.c | 2 +- > tools/testing/selftests/kvm/dirty_log_test.c | 2 +- > tools/testing/selftests/kvm/include/kvm_util.h | 3 ++- > tools/testing/selftests/kvm/lib/kvm_util.c | 7 ++++--- > 4 files changed, 8 insertions(+), 6 deletions(-) > > diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c > index fe6c5a4f8b8c2..eb1f7e4b83de3 100644 > --- a/tools/testing/selftests/kvm/demand_paging_test.c > +++ b/tools/testing/selftests/kvm/demand_paging_test.c > @@ -171,7 +171,7 @@ static struct kvm_vm *create_vm(enum vm_guest_mode mode, int vcpus, > pages += (2 * pages) / PTES_PER_PT; > pages += ((2 * vcpus * vcpu_wss) >> PAGE_SHIFT_4K) / PTES_PER_PT; > > - vm = _vm_create(mode, pages, O_RDWR); > + vm = vm_create(mode, pages, O_RDWR); Eh, we should have removed/renamed _vm_create() with 12c386b23083 ("KVM: selftests: Move vm type into _vm_create() internally") > kvm_vm_elf_load(vm, program_invocation_name, 0, 0); > #ifdef __x86_64__ > vm_create_irqchip(vm); > diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c > index 5614222a66285..181eac3a12b66 100644 > --- a/tools/testing/selftests/kvm/dirty_log_test.c > +++ b/tools/testing/selftests/kvm/dirty_log_test.c > @@ -252,7 +252,7 @@ static struct kvm_vm *create_vm(enum vm_guest_mode mode, uint32_t vcpuid, > struct kvm_vm *vm; > uint64_t extra_pg_pages = extra_mem_pages / 512 * 2; > > - vm = _vm_create(mode, DEFAULT_GUEST_PHY_PAGES + extra_pg_pages, O_RDWR); > + vm = vm_create(mode, DEFAULT_GUEST_PHY_PAGES + extra_pg_pages, O_RDWR); > kvm_vm_elf_load(vm, program_invocation_name, 0, 0); > #ifdef __x86_64__ > vm_create_irqchip(vm); > diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h > index 29cccaf96baf6..4f672c00c9e9b 100644 > --- a/tools/testing/selftests/kvm/include/kvm_util.h > +++ b/tools/testing/selftests/kvm/include/kvm_util.h > @@ -69,7 +69,8 @@ int kvm_check_cap(long cap); > int vm_enable_cap(struct kvm_vm *vm, struct kvm_enable_cap *cap); > > struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm); > -struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm); > +struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t guest_paddr, > + uint64_t phy_pages, int perm); But now we need it again. Or do we? How about just documenting that if phy_pages is >= some-limit then the base address will be 4G, otherwise it will be zero? The documentation (comment above _vm_create()) needs to be updated with this patch regardless. Either the behavior changes or a new parameter is added. If you go with my suggestion to just use 4G when phy_pages are large, then please rename _vm_create to vm_create. Thanks, drew > void kvm_vm_free(struct kvm_vm *vmp); > void kvm_vm_restart(struct kvm_vm *vmp, int perm); > void kvm_vm_release(struct kvm_vm *vmp); > diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c > index 80a338b5403c3..7ec2bbdaba875 100644 > --- a/tools/testing/selftests/kvm/lib/kvm_util.c > +++ b/tools/testing/selftests/kvm/lib/kvm_util.c > @@ -132,7 +132,8 @@ _Static_assert(sizeof(vm_guest_mode_string)/sizeof(char *) == NUM_VM_MODES, > * descriptor to control the created VM is created with the permissions > * given by perm (e.g. O_RDWR). > */ > -struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm) > +struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t guest_paddr, > + uint64_t phy_pages, int perm) > { > struct kvm_vm *vm; > > @@ -229,14 +230,14 @@ struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm) > vm->vpages_mapped = sparsebit_alloc(); > if (phy_pages != 0) > vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, > - 0, 0, phy_pages, 0); > + guest_paddr, 0, phy_pages, 0); > > return vm; > } > > struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm) > { > - return _vm_create(mode, phy_pages, perm); > + return _vm_create(mode, 0, phy_pages, perm); > } > > /* > -- > 2.23.0.444.g18eeb5a265-goog >
diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c index fe6c5a4f8b8c2..eb1f7e4b83de3 100644 --- a/tools/testing/selftests/kvm/demand_paging_test.c +++ b/tools/testing/selftests/kvm/demand_paging_test.c @@ -171,7 +171,7 @@ static struct kvm_vm *create_vm(enum vm_guest_mode mode, int vcpus, pages += (2 * pages) / PTES_PER_PT; pages += ((2 * vcpus * vcpu_wss) >> PAGE_SHIFT_4K) / PTES_PER_PT; - vm = _vm_create(mode, pages, O_RDWR); + vm = vm_create(mode, pages, O_RDWR); kvm_vm_elf_load(vm, program_invocation_name, 0, 0); #ifdef __x86_64__ vm_create_irqchip(vm); diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c index 5614222a66285..181eac3a12b66 100644 --- a/tools/testing/selftests/kvm/dirty_log_test.c +++ b/tools/testing/selftests/kvm/dirty_log_test.c @@ -252,7 +252,7 @@ static struct kvm_vm *create_vm(enum vm_guest_mode mode, uint32_t vcpuid, struct kvm_vm *vm; uint64_t extra_pg_pages = extra_mem_pages / 512 * 2; - vm = _vm_create(mode, DEFAULT_GUEST_PHY_PAGES + extra_pg_pages, O_RDWR); + vm = vm_create(mode, DEFAULT_GUEST_PHY_PAGES + extra_pg_pages, O_RDWR); kvm_vm_elf_load(vm, program_invocation_name, 0, 0); #ifdef __x86_64__ vm_create_irqchip(vm); diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index 29cccaf96baf6..4f672c00c9e9b 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -69,7 +69,8 @@ int kvm_check_cap(long cap); int vm_enable_cap(struct kvm_vm *vm, struct kvm_enable_cap *cap); struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm); -struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm); +struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t guest_paddr, + uint64_t phy_pages, int perm); void kvm_vm_free(struct kvm_vm *vmp); void kvm_vm_restart(struct kvm_vm *vmp, int perm); void kvm_vm_release(struct kvm_vm *vmp); diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index 80a338b5403c3..7ec2bbdaba875 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -132,7 +132,8 @@ _Static_assert(sizeof(vm_guest_mode_string)/sizeof(char *) == NUM_VM_MODES, * descriptor to control the created VM is created with the permissions * given by perm (e.g. O_RDWR). */ -struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm) +struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t guest_paddr, + uint64_t phy_pages, int perm) { struct kvm_vm *vm; @@ -229,14 +230,14 @@ struct kvm_vm *_vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm) vm->vpages_mapped = sparsebit_alloc(); if (phy_pages != 0) vm_userspace_mem_region_add(vm, VM_MEM_SRC_ANONYMOUS, - 0, 0, phy_pages, 0); + guest_paddr, 0, phy_pages, 0); return vm; } struct kvm_vm *vm_create(enum vm_guest_mode mode, uint64_t phy_pages, int perm) { - return _vm_create(mode, phy_pages, perm); + return _vm_create(mode, 0, phy_pages, perm); } /*
KVM creates internal memslots between 3 and 4 GiB paddrs on the first vCPU creation. If memslot 0 is large enough it collides with these memslots an causes vCPU creation to fail. Add a paddr parameter for memslot 0 so that tests which support large VMs can relocate memslot 0 above 4 GiB. Signed-off-by: Ben Gardon <bgardon@google.com> --- tools/testing/selftests/kvm/demand_paging_test.c | 2 +- tools/testing/selftests/kvm/dirty_log_test.c | 2 +- tools/testing/selftests/kvm/include/kvm_util.h | 3 ++- tools/testing/selftests/kvm/lib/kvm_util.c | 7 ++++--- 4 files changed, 8 insertions(+), 6 deletions(-)