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-rw-r--r--arch/x86/include/asm/mshyperv.h351
1 files changed, 351 insertions, 0 deletions
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
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+++ b/arch/x86/include/asm/mshyperv.h
@@ -0,0 +1,351 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_MSHYPER_H
+#define _ASM_X86_MSHYPER_H
+
+#include <linux/types.h>
+#include <linux/nmi.h>
+#include <linux/msi.h>
+#include <linux/io.h>
+#include <asm/hyperv-tlfs.h>
+#include <asm/nospec-branch.h>
+#include <asm/paravirt.h>
+#include <asm/mshyperv.h>
+
+/*
+ * Hyper-V always provides a single IO-APIC at this MMIO address.
+ * Ideally, the value should be looked up in ACPI tables, but it
+ * is needed for mapping the IO-APIC early in boot on Confidential
+ * VMs, before ACPI functions can be used.
+ */
+#define HV_IOAPIC_BASE_ADDRESS 0xfec00000
+
+#define HV_VTL_NORMAL 0x0
+#define HV_VTL_SECURE 0x1
+#define HV_VTL_MGMT 0x2
+
+union hv_ghcb;
+
+DECLARE_STATIC_KEY_FALSE(isolation_type_snp);
+DECLARE_STATIC_KEY_FALSE(isolation_type_tdx);
+
+typedef int (*hyperv_fill_flush_list_func)(
+ struct hv_guest_mapping_flush_list *flush,
+ void *data);
+
+void hyperv_vector_handler(struct pt_regs *regs);
+
+static inline unsigned char hv_get_nmi_reason(void)
+{
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_HYPERV)
+extern int hyperv_init_cpuhp;
+extern bool hyperv_paravisor_present;
+
+extern void *hv_hypercall_pg;
+
+extern u64 hv_current_partition_id;
+
+extern union hv_ghcb * __percpu *hv_ghcb_pg;
+
+bool hv_isolation_type_snp(void);
+bool hv_isolation_type_tdx(void);
+u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2);
+
+/*
+ * DEFAULT INIT GPAT and SEGMENT LIMIT value in struct VMSA
+ * to start AP in enlightened SEV guest.
+ */
+#define HV_AP_INIT_GPAT_DEFAULT 0x0007040600070406ULL
+#define HV_AP_SEGMENT_LIMIT 0xffffffff
+
+int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
+int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
+int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
+
+/*
+ * If the hypercall involves no input or output parameters, the hypervisor
+ * ignores the corresponding GPA pointer.
+ */
+static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
+{
+ u64 input_address = input ? virt_to_phys(input) : 0;
+ u64 output_address = output ? virt_to_phys(output) : 0;
+ u64 hv_status;
+
+#ifdef CONFIG_X86_64
+ if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
+ return hv_tdx_hypercall(control, input_address, output_address);
+
+ if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
+ __asm__ __volatile__("mov %4, %%r8\n"
+ "vmmcall"
+ : "=a" (hv_status), ASM_CALL_CONSTRAINT,
+ "+c" (control), "+d" (input_address)
+ : "r" (output_address)
+ : "cc", "memory", "r8", "r9", "r10", "r11");
+ return hv_status;
+ }
+
+ if (!hv_hypercall_pg)
+ return U64_MAX;
+
+ __asm__ __volatile__("mov %4, %%r8\n"
+ CALL_NOSPEC
+ : "=a" (hv_status), ASM_CALL_CONSTRAINT,
+ "+c" (control), "+d" (input_address)
+ : "r" (output_address),
+ THUNK_TARGET(hv_hypercall_pg)
+ : "cc", "memory", "r8", "r9", "r10", "r11");
+#else
+ u32 input_address_hi = upper_32_bits(input_address);
+ u32 input_address_lo = lower_32_bits(input_address);
+ u32 output_address_hi = upper_32_bits(output_address);
+ u32 output_address_lo = lower_32_bits(output_address);
+
+ if (!hv_hypercall_pg)
+ return U64_MAX;
+
+ __asm__ __volatile__(CALL_NOSPEC
+ : "=A" (hv_status),
+ "+c" (input_address_lo), ASM_CALL_CONSTRAINT
+ : "A" (control),
+ "b" (input_address_hi),
+ "D"(output_address_hi), "S"(output_address_lo),
+ THUNK_TARGET(hv_hypercall_pg)
+ : "cc", "memory");
+#endif /* !x86_64 */
+ return hv_status;
+}
+
+/* Hypercall to the L0 hypervisor */
+static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output)
+{
+ return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output);
+}
+
+/* Fast hypercall with 8 bytes of input and no output */
+static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1)
+{
+ u64 hv_status;
+
+#ifdef CONFIG_X86_64
+ if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
+ return hv_tdx_hypercall(control, input1, 0);
+
+ if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
+ __asm__ __volatile__(
+ "vmmcall"
+ : "=a" (hv_status), ASM_CALL_CONSTRAINT,
+ "+c" (control), "+d" (input1)
+ :: "cc", "r8", "r9", "r10", "r11");
+ } else {
+ __asm__ __volatile__(CALL_NOSPEC
+ : "=a" (hv_status), ASM_CALL_CONSTRAINT,
+ "+c" (control), "+d" (input1)
+ : THUNK_TARGET(hv_hypercall_pg)
+ : "cc", "r8", "r9", "r10", "r11");
+ }
+#else
+ {
+ u32 input1_hi = upper_32_bits(input1);
+ u32 input1_lo = lower_32_bits(input1);
+
+ __asm__ __volatile__ (CALL_NOSPEC
+ : "=A"(hv_status),
+ "+c"(input1_lo),
+ ASM_CALL_CONSTRAINT
+ : "A" (control),
+ "b" (input1_hi),
+ THUNK_TARGET(hv_hypercall_pg)
+ : "cc", "edi", "esi");
+ }
+#endif
+ return hv_status;
+}
+
+static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
+{
+ u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
+
+ return _hv_do_fast_hypercall8(control, input1);
+}
+
+static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1)
+{
+ u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED;
+
+ return _hv_do_fast_hypercall8(control, input1);
+}
+
+/* Fast hypercall with 16 bytes of input */
+static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2)
+{
+ u64 hv_status;
+
+#ifdef CONFIG_X86_64
+ if (hv_isolation_type_tdx() && !hyperv_paravisor_present)
+ return hv_tdx_hypercall(control, input1, input2);
+
+ if (hv_isolation_type_snp() && !hyperv_paravisor_present) {
+ __asm__ __volatile__("mov %4, %%r8\n"
+ "vmmcall"
+ : "=a" (hv_status), ASM_CALL_CONSTRAINT,
+ "+c" (control), "+d" (input1)
+ : "r" (input2)
+ : "cc", "r8", "r9", "r10", "r11");
+ } else {
+ __asm__ __volatile__("mov %4, %%r8\n"
+ CALL_NOSPEC
+ : "=a" (hv_status), ASM_CALL_CONSTRAINT,
+ "+c" (control), "+d" (input1)
+ : "r" (input2),
+ THUNK_TARGET(hv_hypercall_pg)
+ : "cc", "r8", "r9", "r10", "r11");
+ }
+#else
+ {
+ u32 input1_hi = upper_32_bits(input1);
+ u32 input1_lo = lower_32_bits(input1);
+ u32 input2_hi = upper_32_bits(input2);
+ u32 input2_lo = lower_32_bits(input2);
+
+ __asm__ __volatile__ (CALL_NOSPEC
+ : "=A"(hv_status),
+ "+c"(input1_lo), ASM_CALL_CONSTRAINT
+ : "A" (control), "b" (input1_hi),
+ "D"(input2_hi), "S"(input2_lo),
+ THUNK_TARGET(hv_hypercall_pg)
+ : "cc");
+ }
+#endif
+ return hv_status;
+}
+
+static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
+{
+ u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
+
+ return _hv_do_fast_hypercall16(control, input1, input2);
+}
+
+static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2)
+{
+ u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED;
+
+ return _hv_do_fast_hypercall16(control, input1, input2);
+}
+
+extern struct hv_vp_assist_page **hv_vp_assist_page;
+
+static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
+{
+ if (!hv_vp_assist_page)
+ return NULL;
+
+ return hv_vp_assist_page[cpu];
+}
+
+void __init hyperv_init(void);
+void hyperv_setup_mmu_ops(void);
+void set_hv_tscchange_cb(void (*cb)(void));
+void clear_hv_tscchange_cb(void);
+void hyperv_stop_tsc_emulation(void);
+int hyperv_flush_guest_mapping(u64 as);
+int hyperv_flush_guest_mapping_range(u64 as,
+ hyperv_fill_flush_list_func fill_func, void *data);
+int hyperv_fill_flush_guest_mapping_list(
+ struct hv_guest_mapping_flush_list *flush,
+ u64 start_gfn, u64 end_gfn);
+
+#ifdef CONFIG_X86_64
+void hv_apic_init(void);
+void __init hv_init_spinlocks(void);
+bool hv_vcpu_is_preempted(int vcpu);
+#else
+static inline void hv_apic_init(void) {}
+#endif
+
+struct irq_domain *hv_create_pci_msi_domain(void);
+
+int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
+ struct hv_interrupt_entry *entry);
+int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
+
+#ifdef CONFIG_AMD_MEM_ENCRYPT
+bool hv_ghcb_negotiate_protocol(void);
+void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason);
+int hv_snp_boot_ap(int cpu, unsigned long start_ip);
+#else
+static inline bool hv_ghcb_negotiate_protocol(void) { return false; }
+static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {}
+static inline int hv_snp_boot_ap(int cpu, unsigned long start_ip) { return 0; }
+#endif
+
+#if defined(CONFIG_AMD_MEM_ENCRYPT) || defined(CONFIG_INTEL_TDX_GUEST)
+void hv_vtom_init(void);
+void hv_ivm_msr_write(u64 msr, u64 value);
+void hv_ivm_msr_read(u64 msr, u64 *value);
+#else
+static inline void hv_vtom_init(void) {}
+static inline void hv_ivm_msr_write(u64 msr, u64 value) {}
+static inline void hv_ivm_msr_read(u64 msr, u64 *value) {}
+#endif
+
+static inline bool hv_is_synic_reg(unsigned int reg)
+{
+ return (reg >= HV_REGISTER_SCONTROL) &&
+ (reg <= HV_REGISTER_SINT15);
+}
+
+static inline bool hv_is_sint_reg(unsigned int reg)
+{
+ return (reg >= HV_REGISTER_SINT0) &&
+ (reg <= HV_REGISTER_SINT15);
+}
+
+u64 hv_get_register(unsigned int reg);
+void hv_set_register(unsigned int reg, u64 value);
+u64 hv_get_non_nested_register(unsigned int reg);
+void hv_set_non_nested_register(unsigned int reg, u64 value);
+
+static __always_inline u64 hv_raw_get_register(unsigned int reg)
+{
+ return __rdmsr(reg);
+}
+
+#else /* CONFIG_HYPERV */
+static inline void hyperv_init(void) {}
+static inline void hyperv_setup_mmu_ops(void) {}
+static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
+static inline void clear_hv_tscchange_cb(void) {}
+static inline void hyperv_stop_tsc_emulation(void) {};
+static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
+{
+ return NULL;
+}
+static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
+static inline int hyperv_flush_guest_mapping_range(u64 as,
+ hyperv_fill_flush_list_func fill_func, void *data)
+{
+ return -1;
+}
+static inline void hv_set_register(unsigned int reg, u64 value) { }
+static inline u64 hv_get_register(unsigned int reg) { return 0; }
+static inline void hv_set_non_nested_register(unsigned int reg, u64 value) { }
+static inline u64 hv_get_non_nested_register(unsigned int reg) { return 0; }
+#endif /* CONFIG_HYPERV */
+
+
+#ifdef CONFIG_HYPERV_VTL_MODE
+void __init hv_vtl_init_platform(void);
+int __init hv_vtl_early_init(void);
+#else
+static inline void __init hv_vtl_init_platform(void) {}
+static inline int __init hv_vtl_early_init(void) { return 0; }
+#endif
+
+#include <asm-generic/mshyperv.h>
+
+#endif
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