shim: Initial support for KVM_SET_GSI_ROUTING

shim/include/handle_vm_kvm_set_gsi_routing.h

@@ -40,11 +40,12 @@ extern "C"
      *   @brief Handles the execution of kvm_set_gsi_routing.
      *
      * <!-- inputs/outputs -->
+     *   @param pmut_vm the argumento hold vm details of type shim_vm_t
      *   @param pmut_ioctl_args the arguments provided by userspace
      *   @return SHIM_SUCCESS on success, SHIM_FAILURE on failure.
      */
-    NODISCARD int64_t
-    handle_vm_kvm_set_gsi_routing(struct kvm_irq_routing *const pmut_ioctl_args) NOEXCEPT;
+    NODISCARD int64_t handle_vm_kvm_set_gsi_routing(
+        struct shim_vm_t *const pmut_vm, struct kvm_irq_routing *const pmut_ioctl_args) NOEXCEPT;
 
 #ifdef __cplusplus
 }

shim/include/kvm_irq_routing.h

@@ -27,15 +27,115 @@
 #ifndef KVM_IRQ_ROUTING_H
 #define KVM_IRQ_ROUTING_H
 
+#define KVM_ENTRY ((uint32_t)0)
+#define KVM_PAD ((uint32_t)8)
+
 #include <stdint.h>
 
+#define KVM_IRQ_ROUTING_IRQCHIP 1
+#define KVM_IRQ_ROUTING_MSI 2
+#define KVM_IRQ_ROUTING_S390_ADAPTER 3
+
+#ifdef __clang__
+#pragma clang diagnostic ignored "-Wold-style-cast"
+#pragma clang diagnostic ignored "-Wzero-length-array"
+#endif
+
 #ifdef __cplusplus
 extern "C"
 {
 #endif
 
 #pragma pack(push, 1)
 
+    /**
+     * @struct kvm_irq_routing_irqchip
+     *
+     * <!-- description -->
+     *   @brief see /include/uapi/linux/kvm.h in Linux for more details.
+     */
+    //NOLINTNEXTLINE
+    struct kvm_irq_routing_irqchip
+    {
+        /** @brief TODO */
+        uint32_t irqchip;
+        /** @brief TODO */
+        uint32_t pin;
+    };
+
+    /**
+     * @struct kvm_irq_routing_msi
+     *
+     * <!-- description -->
+     *   @brief see /include/uapi/linux/kvm.h in Linux for more details.
+     */
+    //NOLINTNEXTLINE
+    struct kvm_irq_routing_msi
+    {
+        /** @brief TODO */
+        uint32_t address_lo;
+        /** @brief TODO */
+        uint32_t address_hi;
+        /** @brief TODO */
+        uint32_t data;
+        /** @brief TODO */
+        uint32_t pad;
+    };
+
+    /**
+     * @struct kvm_irq_routing_s390_adapter
+     *
+     * <!-- description -->
+     *   @brief see /include/uapi/linux/kvm.h in Linux for more details.
+     */
+    //NOLINTNEXTLINE
+    struct kvm_irq_routing_s390_adapter
+    {
+        /** @brief TODO */
+        uint64_t ind_addr;
+        /** @brief TODO */
+        uint64_t summary_addr;
+        /** @brief TODO */
+        uint64_t ind_offset;
+        /** @brief TODO */
+        uint32_t summary_offset;
+        /** @brief TODO */
+        uint32_t adapter_id;
+    };
+
+    /**
+     * @struct kvm_irq_routing_entry
+     *
+     * <!-- description -->
+     *   @brief see /include/uapi/linux/kvm.h in Linux for more details.
+     */
+    struct kvm_irq_routing_entry    //NOLINT
+    {
+        /** @brief TODO */
+        uint32_t gsi;
+        /** @brief TODO */
+        uint32_t type;
+        /** @brief TODO */
+        uint32_t flags;
+        /** @brief TODO */
+        uint32_t pad;
+        /** @brief TODO */
+        //NOLINTNEXTLINE
+        union
+        {
+            /** @brief TODO */
+            struct kvm_irq_routing_irqchip irqchip;
+            /** @brief TODO */
+            struct kvm_irq_routing_msi msi;
+            /** @brief TODO */
+            struct kvm_irq_routing_s390_adapter adapter;
+            /** @brief TODO */
+            uint32_t pad[KVM_PAD];
+        } /** @brief TODO */ u;
+    };
+    /** TODO: REMOVE ABOVE STRUCTURE: The above structures are part of other branches as of now,
+    * they will be available to include here once respective branches are merged with master. */
+
     /**
      * @struct kvm_irq_routing
      *
@@ -44,8 +144,12 @@ extern "C"
      */
     struct kvm_irq_routing
     {
-        /** @brief replace me with contents from KVM API */
-        int32_t dummy;
+        /** @brief TODO */
+        uint32_t nr;
+        /** @brief TODO */
+        uint32_t flags;
+        /** @brief TODO */
+        struct kvm_irq_routing_entry entries[KVM_ENTRY];
     };
 
 #pragma pack(pop)

shim/include/kvm_irq_routing.hpp

@@ -0,0 +1,56 @@
+/// @copyright
+/// Copyright (C) 2020 Assured Information Security, Inc.
+///
+/// @copyright
+/// Permission is hereby granted, free of charge, to any person obtaining a copy
+/// of this software and associated documentation files (the "Software"), to deal
+/// in the Software without restriction, including without limitation the rights
+/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+/// copies of the Software, and to permit persons to whom the Software is
+/// furnished to do so, subject to the following conditions:
+///
+/// @copyright
+/// The above copyright notice and this permission notice shall be included in
+/// all copies or substantial portions of the Software.
+///
+/// @copyright
+/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+/// SOFTWARE.
+
+#ifndef KVM_IRQ_ROUTING_HPP
+#define KVM_IRQ_ROUTING_HPP
+
+#include <bsl/safe_integral.hpp>
+
+#pragma pack(push, 1)
+
+namespace shim
+{
+    /// @brief defines the size of the padding field
+    /// @struct kvm_irq_routing
+    ///
+    /// <!-- description -->
+    ///   @brief see /include/uapi/linux/kvm.h in Linux for more details.
+    ///
+
+    struct kvm_irq_routing final
+    {
+
+        /** @brief TODO */
+        bsl::uint32 nr;
+        /** @brief TODO */
+        bsl::uint32 flags;
+        /** @brief TODO */
+        // TODO: Below structure to be uncommented when all other branches of IOCTL are merged with master.
+        //struct kvm_irq_routing_entry entries[KVM_ENTRY];
+    };
+}
+
+#pragma pack(pop)
+
+#endif

shim/integration/CMakeLists.txt

@@ -56,3 +56,4 @@ microv_add_shim_integration(kvm_set_irqchip HEADERS)
 microv_add_shim_integration(kvm_get_lapic HEADERS)
 microv_add_shim_integration(kvm_set_lapic HEADERS)
 microv_add_shim_integration(kvm_irqfd HEADERS)
+microv_add_shim_integration(kvm_irq_routing HEADERS)

shim/integration/kvm_irq_routing.cpp

@@ -0,0 +1,56 @@
+/// @copyright
+/// Copyright (C) 2020 Assured Information Security, Inc.
+///
+/// @copyright
+/// Permission is hereby granted, free of charge, to any person obtaining a copy
+/// of this software and associated documentation files (the "Software"), to deal
+/// in the Software without restriction, including without limitation the rights
+/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+/// copies of the Software, and to permit persons to whom the Software is
+/// furnished to do so, subject to the following conditions:
+///
+/// @copyright
+/// The above copyright notice and this permission notice shall be included in
+/// all copies or substantial portions of the Software.
+///
+/// @copyright
+/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+/// SOFTWARE.
+
+#include <integration_utils.hpp>
+#include <ioctl_t.hpp>
+#include <shim_platform_interface.hpp>
+
+#include <bsl/convert.hpp>
+#include <bsl/enable_color.hpp>
+#include <bsl/exit_code.hpp>
+#include <bsl/safe_integral.hpp>
+
+/// <!-- description -->
+///   @brief Provides the main entry point for this application.
+///
+/// <!-- inputs/outputs -->
+///   @return bsl::exit_success on success, bsl::exit_failure otherwise.
+///
+[[nodiscard]] auto
+main() noexcept -> bsl::exit_code
+{
+    bsl::enable_color();
+    integration::ioctl_t mut_system_ctl{shim::DEVICE_NAME};
+    auto const vmfd{mut_system_ctl.send(shim::KVM_CREATE_VM)};
+    integration::ioctl_t mut_vm{bsl::to_i32(vmfd)};
+    auto const vcpufd{mut_vm.send(shim::KVM_CREATE_VCPU)};
+    integration::ioctl_t mut_vcpu{bsl::to_i32(vcpufd)};
+    constexpr auto mut_ret{0_i64};
+    {
+        auto const irqrouting{mut_vcpu.send(shim::KVM_SET_GSI_ROUTING)};
+        integration::verify(irqrouting.is_pos());
+        integration::verify(irqrouting >= mut_ret.get());
+    }
+    return bsl::exit_success;
+}

shim/linux/include/platform_interface/shim_platform_interface.hpp

@@ -31,6 +31,7 @@
 #include <kvm_cpuid2.hpp>
 #include <kvm_cpuid_entry2.hpp>
 #include <kvm_fpu.hpp>
+#include <kvm_irq_routing.hpp>
 #include <kvm_irqchip.hpp>
 #include <kvm_irqfd.hpp>
 #include <kvm_mp_state.hpp>
@@ -216,8 +217,9 @@ namespace shim
     /// @brief defines KVM's KVM_GET_SUPPORTED_CPUID IOCTL
     constexpr bsl::safe_umx KVM_GET_SUPPORTED_CPUID{static_cast<bsl::uintmx>(_IOWR_LIST(
         SHIMIO.get(), 0x05, struct kvm_cpuid2, struct kvm_cpuid_entry2[CPUID2_MAX_ENTRIES.get()]))};
-    // /// @brief defines KVM's KVM_SET_GSI_ROUTING IOCTL
-    // constexpr bsl::safe_umx KVM_SET_GSI_ROUTING{static_cast<bsl::uintmx>(_IOW(SHIMIO.get(), 0x6a, struct kvm_irq_routing))};
+    /// @brief defines KVM's KVM_SET_GSI_ROUTING IOCTL
+    constexpr bsl::safe_umx KVM_SET_GSI_ROUTING{
+        static_cast<bsl::uintmx>(_IOW(SHIMIO.get(), 0x6a, struct kvm_irq_routing))};
     /// @brief defines KVM's KVM_GET_TSC_KHZ IOCTL
     constexpr bsl::safe_umx KVM_GET_TSC_KHZ{static_cast<bsl::uintmx>(_IO(SHIMIO.get(), 0xa3))};
     /// @brief defines KVM's KVM_SET_TSC_KHZ IOCTL

shim/linux/src/entry.c

@@ -56,6 +56,7 @@
 #include <handle_vm_kvm_destroy_vcpu.h>
 #include <handle_vm_kvm_get_irqchip.h>
 #include <handle_vm_kvm_irqfd.h>
+#include <handle_vm_kvm_set_gsi_routing.h>
 #include <handle_vm_kvm_set_irqchip.h>
 #include <handle_vm_kvm_set_user_memory_region.h>
 #include <linux/anon_inodes.h>
@@ -723,10 +724,24 @@ dispatch_vm_kvm_set_device_attr(struct kvm_device_attr *const ioctl_args)
 }
 
 static long
-dispatch_vm_kvm_set_gsi_routing(struct kvm_irq_routing *const ioctl_args)
+dispatch_vm_kvm_set_gsi_routing(
+    struct shim_vm_t *const pmut_vm,
+    struct kvm_irq_routing *const pmut_ioctl_args)
 {
-    (void)ioctl_args;
-    return -EINVAL;
+    struct kvm_irq_routing mut_args;
+    uint64_t const size = sizeof(mut_args);
+
+    if (platform_copy_from_user(&mut_args, pmut_ioctl_args, size)) {
+        bferror("platform_copy_from_user failed");
+        return -EINVAL;
+    }
+
+    if (handle_vm_kvm_set_gsi_routing(pmut_vm, &mut_args)) {
+        bferror("handle_vm_kvm_set_gsi_routing failed");
+        return -EINVAL;
+    }
+
+    return 0;
 }
 
 static long
@@ -952,7 +967,9 @@ dev_unlocked_ioctl_vm(
 
         case KVM_SET_GSI_ROUTING: {
             return dispatch_vm_kvm_set_gsi_routing(
+                (struct shim_vm_t *)pmut_mut_vm,
                 (struct kvm_irq_routing *)ioctl_args);
+            ;
         }
 
         case KVM_SET_IDENTITY_MAP_ADDR: {

shim/src/handle_vm_kvm_set_gsi_routing.c

@@ -24,20 +24,33 @@
  * SOFTWARE.
  */
 
+#include <debug.h>
+#include <detect_hypervisor.h>
 #include <kvm_irq_routing.h>
 #include <mv_types.h>
+#include <platform.h>
+#include <shim_vm_t.h>
 
 /**
  * <!-- description -->
  *   @brief Handles the execution of kvm_set_gsi_routing.
  *
  * <!-- inputs/outputs -->
+ *   @param pmut_vm the argumento hold vm details of type shim_vm_t
  *   @param pmut_ioctl_args the arguments provided by userspace
  *   @return SHIM_SUCCESS on success, SHIM_FAILURE on failure.
  */
 NODISCARD int64_t
-handle_vm_kvm_set_gsi_routing(struct kvm_irq_routing *const pmut_ioctl_args) NOEXCEPT
+handle_vm_kvm_set_gsi_routing(
+    struct shim_vm_t *const pmut_vm, struct kvm_irq_routing *const pmut_ioctl_args) NOEXCEPT
 {
-    (void)pmut_ioctl_args;
+    platform_expects(NULL != pmut_vm);
+    platform_expects(NULL != pmut_ioctl_args);
+
+    if (detect_hypervisor()) {
+        bferror("The shim is not running in a VM. Did you forget to start MicroV?");
+        return SHIM_FAILURE;
+    }
+    //TODO: Cally the hypercall here after its implementation
     return SHIM_SUCCESS;
 }