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Ip=[165.204.84.17]; Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN2PEPF0000A890.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8043 Received-SPF: permerror client-ip=2a01:111:f403:c105::7; envelope-from=Michael.Roth@amd.com; helo=CH4PR04CU002.outbound.protection.outlook.com X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.341, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Peter Xu Detect supported guest-memfd flags by the current kernel, and reject creations of guest-memfd using invalid flags. When the cap isn't available, then no flag is supported. Reviewed-by: Xiaoyao Li Signed-off-by: Peter Xu Reviewed-by: Fabiano Rosas Reviewed-by: Michael Roth Signed-off-by: Michael Roth --- accel/kvm/kvm-all.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index cdc7554082..120cab1e22 100644 --- a/accel/kvm/kvm-all.c +++ b/accel/kvm/kvm-all.c @@ -107,6 +107,7 @@ bool kvm_pre_fault_memory_supported; static bool kvm_immediate_exit; static uint64_t kvm_supported_memory_attributes; static bool kvm_guest_memfd_supported; +static uint64_t kvm_guest_memfd_flags_supported; static hwaddr kvm_max_slot_size = ~0; static const KVMCapabilityInfo kvm_required_capabilities[] = { @@ -3065,6 +3066,8 @@ static int kvm_init(AccelState *as, MachineState *ms) kvm_vm_check_extension(s, KVM_CAP_GUEST_MEMFD) && kvm_vm_check_extension(s, KVM_CAP_USER_MEMORY2); kvm_pre_fault_memory_supported = kvm_vm_check_extension(s, KVM_CAP_PRE_FAULT_MEMORY); + kvm_guest_memfd_flags_supported = + kvm_vm_check_extension(s, KVM_CAP_GUEST_MEMFD_FLAGS); if (s->kernel_irqchip_split == ON_OFF_AUTO_AUTO) { s->kernel_irqchip_split = mc->default_kernel_irqchip_split ? ON_OFF_AUTO_ON : ON_OFF_AUTO_OFF; @@ -4760,6 +4763,13 @@ int kvm_create_guest_memfd(uint64_t size, uint64_t flags, Error **errp) return -1; } + if (flags & ~kvm_guest_memfd_flags_supported) { + error_setg(errp, "Current KVM instance does not support " + "guest-memfd flag: 0x%"PRIx64, + flags & ~kvm_guest_memfd_flags_supported); + return -1; + } + fd = kvm_vm_ioctl(kvm_state, KVM_CREATE_GUEST_MEMFD, &guest_memfd); if (fd < 0) { error_setg_errno(errp, errno, "Error creating KVM guest_memfd"); -- 2.43.0