From: Ștefan Șicleru <[email protected]> The introspection tool will use this command to get the memory address range for which it can set access restrictions.
Signed-off-by: Ștefan Șicleru <[email protected]> Co-developed-by: Nicușor Cîțu <[email protected]> Signed-off-by: Nicușor Cîțu <[email protected]> Signed-off-by: Adalbert Lazăr <[email protected]> --- Documentation/virt/kvm/kvmi.rst | 19 +++++++++++++++++++ include/uapi/linux/kvmi.h | 6 ++++++ .../testing/selftests/kvm/x86_64/kvmi_test.c | 12 ++++++++++++ virt/kvm/introspection/kvmi_msg.c | 13 +++++++++++++ 4 files changed, 50 insertions(+) diff --git a/Documentation/virt/kvm/kvmi.rst b/Documentation/virt/kvm/kvmi.rst index 4263a9ac90e4..7da8efd18b89 100644 --- a/Documentation/virt/kvm/kvmi.rst +++ b/Documentation/virt/kvm/kvmi.rst @@ -789,6 +789,25 @@ exception. * -KVM_EBUSY - another *KVMI_VCPU_INJECT_EXCEPTION*-*KVMI_EVENT_TRAP* pair is in progress +17. KVMI_VM_GET_MAX_GFN +----------------------- + +:Architecture: all +:Versions: >= 1 +:Parameters: none +:Returns: + +:: + + struct kvmi_error_code; + struct kvmi_vm_get_max_gfn_reply { + __u64 gfn; + }; + +Provides the maximum GFN allocated to the VM by walking through all +memory slots allocated by KVM. Stricly speaking, the returned value refers +to the first inaccessible GFN, next to the maximum accessible GFN. + Events ====== diff --git a/include/uapi/linux/kvmi.h b/include/uapi/linux/kvmi.h index faf4624d7a97..2a4cc8c41465 100644 --- a/include/uapi/linux/kvmi.h +++ b/include/uapi/linux/kvmi.h @@ -37,6 +37,8 @@ enum { KVMI_VCPU_CONTROL_CR = 15, KVMI_VCPU_INJECT_EXCEPTION = 16, + KVMI_VM_GET_MAX_GFN = 17, + KVMI_NUM_MESSAGES }; @@ -149,6 +151,10 @@ struct kvmi_vm_control_cleanup { __u32 padding3; }; +struct kvmi_vm_get_max_gfn_reply { + __u64 gfn; +}; + struct kvmi_event { __u16 size; __u16 vcpu; diff --git a/tools/testing/selftests/kvm/x86_64/kvmi_test.c b/tools/testing/selftests/kvm/x86_64/kvmi_test.c index 9abf4ec0d09a..105adf75a68d 100644 --- a/tools/testing/selftests/kvm/x86_64/kvmi_test.c +++ b/tools/testing/selftests/kvm/x86_64/kvmi_test.c @@ -1420,6 +1420,17 @@ static void test_cmd_vcpu_inject_exception(struct kvm_vm *vm) disable_vcpu_event(vm, KVMI_EVENT_BREAKPOINT); } +static void test_cmd_vm_get_max_gfn(void) +{ + struct kvmi_vm_get_max_gfn_reply rpl; + struct kvmi_msg_hdr req; + + test_vm_command(KVMI_VM_GET_MAX_GFN, &req, sizeof(req), + &rpl, sizeof(rpl)); + + pr_info("max_gfn: 0x%llx\n", rpl.gfn); +} + static void test_introspection(struct kvm_vm *vm) { srandom(time(0)); @@ -1445,6 +1456,7 @@ static void test_introspection(struct kvm_vm *vm) test_cmd_vm_control_cleanup(vm); test_cmd_vcpu_control_cr(vm); test_cmd_vcpu_inject_exception(vm); + test_cmd_vm_get_max_gfn(); unhook_introspection(vm); } diff --git a/virt/kvm/introspection/kvmi_msg.c b/virt/kvm/introspection/kvmi_msg.c index 63efb85ff1ae..18bc1a711845 100644 --- a/virt/kvm/introspection/kvmi_msg.c +++ b/virt/kvm/introspection/kvmi_msg.c @@ -322,6 +322,18 @@ static int handle_vm_control_cleanup(struct kvm_introspection *kvmi, return kvmi_msg_vm_reply(kvmi, msg, ec, NULL, 0); } +static int handle_vm_get_max_gfn(struct kvm_introspection *kvmi, + const struct kvmi_msg_hdr *msg, + const void *req) +{ + struct kvmi_vm_get_max_gfn_reply rpl; + + memset(&rpl, 0, sizeof(rpl)); + rpl.gfn = kvm_get_max_gfn(kvmi->kvm); + + return kvmi_msg_vm_reply(kvmi, msg, 0, &rpl, sizeof(rpl)); +} + /* * These commands are executed by the receiving thread. */ @@ -334,6 +346,7 @@ static int(*const msg_vm[])(struct kvm_introspection *, [KVMI_VM_CONTROL_CLEANUP] = handle_vm_control_cleanup, [KVMI_VM_CONTROL_EVENTS] = handle_vm_control_events, [KVMI_VM_GET_INFO] = handle_vm_get_info, + [KVMI_VM_GET_MAX_GFN] = handle_vm_get_max_gfn, [KVMI_VM_READ_PHYSICAL] = handle_vm_read_physical, [KVMI_VM_WRITE_PHYSICAL] = handle_vm_write_physical, }; _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
