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KVM: selftests: arm64: Check for supported page sizes 

Just as arm64 implemenations don't necessary support all IPA
ranges, they don't  all support the same page sizes either. Fun.

Create a dummy VM to snapshot the page sizes supported by the
host, and filter the supported modes.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Link: https://lore.kernel.org/r/20211227124809.1335409-4-maz@kernel.org
This commit is contained in:
Marc Zyngier 2021-12-27 12:48:06 +00:00
parent 357c628e12
commit 0303ffdb9e
3 changed files with 50 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
tools/testing/selftests/kvm/include/aarch64/processor.h
View File

@ -113,6 +113,9 @@ enum {
#define ESR_EC_WP_CURRENT 0x35
#define ESR_EC_BRK_INS 0x3c
void aarch64_get_supported_page_sizes(uint32_t ipa,
bool *ps4k, bool *ps16k, bool *ps64k);
void vm_init_descriptor_tables(struct kvm_vm *vm);
void vcpu_init_descriptor_tables(struct kvm_vm *vm, uint32_t vcpuid);

36
tools/testing/selftests/kvm/lib/aarch64/processor.c
View File

@ -8,6 +8,7 @@
#include <linux/compiler.h>
#include <assert.h>
#include "guest_modes.h"
#include "kvm_util.h"
#include "../kvm_util_internal.h"
#include "processor.h"
@ -433,6 +434,41 @@ uint32_t guest_get_vcpuid(void)
return read_sysreg(tpidr_el1);
}
void aarch64_get_supported_page_sizes(uint32_t ipa,
bool *ps4k, bool *ps16k, bool *ps64k)
{
struct kvm_vcpu_init preferred_init;
int kvm_fd, vm_fd, vcpu_fd, err;
uint64_t val;
struct kvm_one_reg reg = {
.id = KVM_ARM64_SYS_REG(SYS_ID_AA64MMFR0_EL1),
.addr = (uint64_t)&val,
};
kvm_fd = open_kvm_dev_path_or_exit();
vm_fd = ioctl(kvm_fd, KVM_CREATE_VM, ipa);
TEST_ASSERT(vm_fd >= 0, "Can't create VM");
vcpu_fd = ioctl(vm_fd, KVM_CREATE_VCPU, 0);
TEST_ASSERT(vcpu_fd >= 0, "Can't create vcpu");
err = ioctl(vm_fd, KVM_ARM_PREFERRED_TARGET, &preferred_init);
TEST_ASSERT(err == 0, "Can't get target");
err = ioctl(vcpu_fd, KVM_ARM_VCPU_INIT, &preferred_init);
TEST_ASSERT(err == 0, "Can't get init vcpu");
err = ioctl(vcpu_fd, KVM_GET_ONE_REG, &reg);
TEST_ASSERT(err == 0, "Can't get MMFR0");
*ps4k = ((val >> 28) & 0xf) != 0xf;
*ps64k = ((val >> 24) & 0xf) == 0;
*ps16k = ((val >> 20) & 0xf) != 0;
close(vcpu_fd);
close(vm_fd);
close(kvm_fd);
}
/*
* arm64 doesn't have a true default mode, so start by computing the
* available IPA space and page sizes early.

17
tools/testing/selftests/kvm/lib/guest_modes.c
View File

@ -5,6 +5,7 @@
#include "guest_modes.h"
#ifdef __aarch64__
#include "processor.h"
enum vm_guest_mode vm_mode_default;
#endif
@ -17,20 +18,24 @@ void guest_modes_append_default(void)
#else
{
unsigned int limit = kvm_check_cap(KVM_CAP_ARM_VM_IPA_SIZE);
bool ps4k, ps16k, ps64k;
int i;
aarch64_get_supported_page_sizes(limit, &ps4k, &ps16k, &ps64k);
vm_mode_default = NUM_VM_MODES;
if (limit >= 52)
guest_mode_append(VM_MODE_P52V48_64K, true, true);
guest_mode_append(VM_MODE_P52V48_64K, ps64k, ps64k);
if (limit >= 48) {
guest_mode_append(VM_MODE_P48V48_4K, true, true);
guest_mode_append(VM_MODE_P48V48_64K, true, true);
guest_mode_append(VM_MODE_P48V48_4K, ps4k, ps4k);
guest_mode_append(VM_MODE_P48V48_64K, ps64k, ps64k);
}
if (limit >= 40) {
guest_mode_append(VM_MODE_P40V48_4K, true, true);
guest_mode_append(VM_MODE_P40V48_64K, true, true);
vm_mode_default = VM_MODE_P40V48_4K;
guest_mode_append(VM_MODE_P40V48_4K, ps4k, ps4k);
guest_mode_append(VM_MODE_P40V48_64K, ps64k, ps64k);
if (ps4k)
vm_mode_default = VM_MODE_P40V48_4K;
}
/*