[RFC PATCH 18/18] virt/mshv: Add enlightenment bits to create partition ioctl
From: Nuno Das Neves
Date: Fri Nov 20 2020 - 19:31:18 EST
Introduce hv_partition_synthetic_processor features mask to
MSHV_CREATE_PARTITION ioctl, which can be used to enable hypervisor
enlightenments for exo partitions.
Signed-off-by: Nuno Das Neves <nunodasneves@xxxxxxxxxxxxxxxxxxx>
---
Documentation/virt/mshv/api.rst | 3 +
arch/x86/include/uapi/asm/hyperv-tlfs.h | 125 ++++++++++++++++++++++++
include/uapi/asm-generic/hyperv-tlfs.h | 1 +
include/uapi/linux/mshv.h | 1 +
virt/mshv/mshv_main.c | 57 +++++++----
5 files changed, 167 insertions(+), 20 deletions(-)
diff --git a/Documentation/virt/mshv/api.rst b/Documentation/virt/mshv/api.rst
index 609400313b7e..afd56fff1038 100644
--- a/Documentation/virt/mshv/api.rst
+++ b/Documentation/virt/mshv/api.rst
@@ -167,4 +167,7 @@ The page is laid out in struct hv_vp_register_page in asm/hyperv-tlfs.h.
Can be used to get/set various properties of a partition.
+Some properties can only be set at partition creation. For these, there are
+parameters in MSHV_CREATE_PARTITION.
+
diff --git a/arch/x86/include/uapi/asm/hyperv-tlfs.h b/arch/x86/include/uapi/asm/hyperv-tlfs.h
index a241178567ff..65cd0d166d5b 100644
--- a/arch/x86/include/uapi/asm/hyperv-tlfs.h
+++ b/arch/x86/include/uapi/asm/hyperv-tlfs.h
@@ -1184,4 +1184,129 @@ struct hv_vp_register_page {
__u64 instruction_emulation_hints;
};
+#define HV_PARTITION_SYNTHETIC_PROCESSOR_FEATURES_BANKS 1
+
+union hv_partition_synthetic_processor_features {
+ __u64 as_uint64[HV_PARTITION_SYNTHETIC_PROCESSOR_FEATURES_BANKS];
+
+ struct {
+ /* Report a hypervisor is present. CPUID leaves
+ * 0x40000000 and 0x40000001 are supported.
+ */
+ __u64 hypervisor_present:1;
+
+ /*
+ * Features associated with HV#1:
+ */
+
+ /* Report support for Hv1 (CPUID leaves 0x40000000 - 0x40000006). */
+ __u64 hv1:1;
+
+ /* Access to HV_X64_MSR_VP_RUNTIME.
+ * Corresponds to access_vp_run_time_reg privilege.
+ */
+ __u64 access_vp_run_time_reg:1;
+
+ /* Access to HV_X64_MSR_TIME_REF_COUNT.
+ * Corresponds to access_partition_reference_counter privilege.
+ */
+ __u64 access_partition_reference_counter:1;
+
+ /* Access to SINT-related registers (HV_X64_MSR_SCONTROL through
+ * HV_X64_MSR_EOM and HV_X64_MSR_SINT0 through HV_X64_MSR_SINT15).
+ * Corresponds to access_synic_regs privilege.
+ */
+ __u64 access_synic_regs:1;
+
+ /* Access to synthetic timers and associated MSRs
+ * (HV_X64_MSR_STIMER0_CONFIG through HV_X64_MSR_STIMER3_COUNT).
+ * Corresponds to access_synthetic_timer_regs privilege.
+ */
+ __u64 access_synthetic_timer_regs:1;
+
+ /* Access to APIC MSRs (HV_X64_MSR_EOI, HV_X64_MSR_ICR and HV_X64_MSR_TPR)
+ * as well as the VP assist page.
+ * Corresponds to access_intr_ctrl_regs privilege.
+ */
+ __u64 access_intr_ctrl_regs:1;
+
+ /* Access to registers associated with hypercalls (HV_X64_MSR_GUEST_OS_ID
+ * and HV_X64_MSR_HYPERCALL).
+ * Corresponds to access_hypercall_msrs privilege.
+ */
+ __u64 access_hypercall_regs:1;
+
+ /* VP index can be queried. corresponds to access_vp_index privilege. */
+ __u64 access_vp_index:1;
+
+ /* Access to the reference TSC. Corresponds to access_partition_reference_tsc
+ * privilege.
+ */
+ __u64 access_partition_reference_tsc:1;
+
+ /* Partition has access to the guest idle reg. Corresponds to
+ * access_guest_idle_reg privilege.
+ */
+ __u64 access_guest_idle_reg:1;
+
+ /* Partition has access to frequency regs. corresponds to access_frequency_regs
+ * privilege.
+ */
+ __u64 access_frequency_regs:1;
+
+ __u64 reserved_z12:1; /* Reserved for access_reenlightenment_controls. */
+ __u64 reserved_z13:1; /* Reserved for access_root_scheduler_reg. */
+ __u64 reserved_z14:1; /* Reserved for access_tsc_invariant_controls. */
+
+ /* Extended GVA ranges for HvCallFlushVirtualAddressList hypercall.
+ * Corresponds to privilege.
+ */
+ __u64 enable_extended_gva_ranges_for_flush_virtual_address_list:1;
+
+ __u64 reserved_z16:1; /* Reserved for access_vsm. */
+ __u64 reserved_z17:1; /* Reserved for access_vp_registers. */
+
+ /* Use fast hypercall output. Corresponds to privilege. */
+ __u64 fast_hypercall_output:1;
+
+ __u64 reserved_z19:1; /* Reserved for enable_extended_hypercalls. */
+
+ /*
+ * HvStartVirtualProcessor can be used to start virtual processors.
+ * Corresponds to privilege.
+ */
+ __u64 start_virtual_processor:1;
+
+ __u64 reserved_z21:1; /* Reserved for Isolation. */
+
+ /* Synthetic timers in direct mode. */
+ __u64 direct_synthetic_timers:1;
+
+ __u64 reserved_z23:1; /* Reserved for synthetic time unhalted timer */
+
+ /* Use extended processor masks. */
+ __u64 extended_processor_masks:1;
+
+ /* HvCallFlushVirtualAddressSpace / HvCallFlushVirtualAddressList are supported. */
+ __u64 tb_flush_hypercalls:1;
+
+ /* HvCallSendSyntheticClusterIpi is supported. */
+ __u64 synthetic_cluster_ipi:1;
+
+ /* HvCallNotifyLongSpinWait is supported. */
+ __u64 notify_long_spin_wait:1;
+
+ /* HvCallQueryNumaDistance is supported. */
+ __u64 query_numa_distance:1;
+
+ /* HvCallSignalEvent is supported. Corresponds to privilege. */
+ __u64 signal_events:1;
+
+ /* HvCallRetargetDeviceInterrupt is supported. */
+ __u64 retarget_device_interrupt:1;
+
+ __u64 reserved:33;
+ };
+};
+
#endif
diff --git a/include/uapi/asm-generic/hyperv-tlfs.h b/include/uapi/asm-generic/hyperv-tlfs.h
index d1c341de34fe..5c6379a3cfd5 100644
--- a/include/uapi/asm-generic/hyperv-tlfs.h
+++ b/include/uapi/asm-generic/hyperv-tlfs.h
@@ -100,6 +100,7 @@ enum hv_vp_state_page_type {
enum hv_partition_property_code {
/* Privilege properties */
HV_PARTITION_PROPERTY_PRIVILEGE_FLAGS = 0x00010000,
+ HV_PARTITION_PROPERTY_SYNTHETIC_PROC_FEATURES = 0x00010001,
/* Scheduling properties */
HV_PARTITION_PROPERTY_SUSPEND = 0x00020000,
diff --git a/include/uapi/linux/mshv.h b/include/uapi/linux/mshv.h
index 721f5b1999d5..bf2d8c8a0a37 100644
--- a/include/uapi/linux/mshv.h
+++ b/include/uapi/linux/mshv.h
@@ -18,6 +18,7 @@
struct mshv_create_partition {
__u64 flags;
struct hv_partition_creation_properties partition_creation_properties;
+ union hv_partition_synthetic_processor_features synthetic_processor_features;
};
/*
diff --git a/virt/mshv/mshv_main.c b/virt/mshv/mshv_main.c
index bfbadeb4f1fe..78a1e70cac96 100644
--- a/virt/mshv/mshv_main.c
+++ b/virt/mshv/mshv_main.c
@@ -547,6 +547,33 @@ hv_call_map_vp_state_page(u32 vp_index, u64 partition_id,
return ret;
}
+static long
+hv_call_set_partition_property(u64 partition_id,
+ u64 property_code,
+ u64 property_value)
+{
+ int status;
+ unsigned long flags;
+ struct hv_set_partition_property *input;
+
+ local_irq_save(flags);
+ input = (struct hv_set_partition_property *)(*this_cpu_ptr(
+ hyperv_pcpu_input_arg));
+ memset(input, 0, sizeof(*input));
+ input->partition_id = partition_id;
+ input->property_code = property_code;
+ input->property_value = property_value;
+ status = hv_do_hypercall(HVCALL_SET_PARTITION_PROPERTY,
+ input,
+ NULL) & HV_HYPERCALL_RESULT_MASK;
+ local_irq_restore(flags);
+
+ if (status != HV_STATUS_SUCCESS)
+ pr_err("%s: %s\n", __func__, hv_status_to_string(status));
+
+ return -hv_status_to_errno(status);
+}
+
static void
mshv_isr(void)
{
@@ -1373,30 +1400,13 @@ mshv_partition_ioctl_set_property(struct mshv_partition *partition,
void __user *user_args)
{
struct mshv_partition_property args;
- int status;
- unsigned long flags;
- struct hv_set_partition_property *input;
if (copy_from_user(&args, user_args, sizeof(args)))
return -EFAULT;
- local_irq_save(flags);
- input = (struct hv_set_partition_property *)(*this_cpu_ptr(
- hyperv_pcpu_input_arg));
- memset(input, 0, sizeof(*input));
- input->partition_id = partition->id;
- input->property_code = args.property_code;
- input->property_value = args.property_value;
- status = hv_do_hypercall(HVCALL_SET_PARTITION_PROPERTY, input,
- NULL) & HV_HYPERCALL_RESULT_MASK;
- local_irq_restore(flags);
-
- if (status != HV_STATUS_SUCCESS) {
- pr_err("%s: %s\n", __func__, hv_status_to_string(status));
- return -hv_status_to_errno(status);
- }
-
- return 0;
+ return hv_call_set_partition_property(partition->id,
+ args.property_code,
+ args.property_value);
}
static long
@@ -1831,6 +1841,13 @@ mshv_ioctl_create_partition(void __user *user_arg)
if (ret)
goto put_fd;
+ ret = hv_call_set_partition_property(
+ partition->id,
+ HV_PARTITION_PROPERTY_SYNTHETIC_PROC_FEATURES,
+ args.synthetic_processor_features.as_uint64[0]);
+ if (ret)
+ goto delete_partition;
+
ret = hv_call_initialize_partition(partition->id);
if (ret)
goto delete_partition;
--
2.25.1