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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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e39acc37db
With the intent to provide local_clock_noinstr(), a variant of local_clock() that's safe to be called from noinstr code (with the assumption that any such code will already be non-preemptible), prepare for things by making the Hyper-V TSC and MSR sched_clock implementations noinstr. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Co-developed-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Michael Kelley <mikelley@microsoft.com> # Hyper-V Link: https://lore.kernel.org/r/20230519102715.843039089@infradead.org
296 lines
8.2 KiB
C
296 lines
8.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_MSHYPER_H
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#define _ASM_X86_MSHYPER_H
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#include <linux/types.h>
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#include <linux/nmi.h>
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#include <linux/msi.h>
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#include <asm/io.h>
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#include <asm/hyperv-tlfs.h>
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#include <asm/nospec-branch.h>
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#include <asm/paravirt.h>
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#include <asm/mshyperv.h>
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/*
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* Hyper-V always provides a single IO-APIC at this MMIO address.
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* Ideally, the value should be looked up in ACPI tables, but it
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* is needed for mapping the IO-APIC early in boot on Confidential
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* VMs, before ACPI functions can be used.
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*/
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#define HV_IOAPIC_BASE_ADDRESS 0xfec00000
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#define HV_VTL_NORMAL 0x0
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#define HV_VTL_SECURE 0x1
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#define HV_VTL_MGMT 0x2
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union hv_ghcb;
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DECLARE_STATIC_KEY_FALSE(isolation_type_snp);
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typedef int (*hyperv_fill_flush_list_func)(
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struct hv_guest_mapping_flush_list *flush,
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void *data);
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void hyperv_vector_handler(struct pt_regs *regs);
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static inline unsigned char hv_get_nmi_reason(void)
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{
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return 0;
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}
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#if IS_ENABLED(CONFIG_HYPERV)
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extern int hyperv_init_cpuhp;
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extern void *hv_hypercall_pg;
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extern u64 hv_current_partition_id;
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extern union hv_ghcb * __percpu *hv_ghcb_pg;
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int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages);
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int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id);
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int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags);
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static inline u64 hv_do_hypercall(u64 control, void *input, void *output)
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{
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u64 input_address = input ? virt_to_phys(input) : 0;
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u64 output_address = output ? virt_to_phys(output) : 0;
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u64 hv_status;
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#ifdef CONFIG_X86_64
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if (!hv_hypercall_pg)
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return U64_MAX;
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__asm__ __volatile__("mov %4, %%r8\n"
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CALL_NOSPEC
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: "=a" (hv_status), ASM_CALL_CONSTRAINT,
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"+c" (control), "+d" (input_address)
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: "r" (output_address),
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THUNK_TARGET(hv_hypercall_pg)
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: "cc", "memory", "r8", "r9", "r10", "r11");
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#else
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u32 input_address_hi = upper_32_bits(input_address);
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u32 input_address_lo = lower_32_bits(input_address);
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u32 output_address_hi = upper_32_bits(output_address);
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u32 output_address_lo = lower_32_bits(output_address);
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if (!hv_hypercall_pg)
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return U64_MAX;
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__asm__ __volatile__(CALL_NOSPEC
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: "=A" (hv_status),
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"+c" (input_address_lo), ASM_CALL_CONSTRAINT
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: "A" (control),
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"b" (input_address_hi),
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"D"(output_address_hi), "S"(output_address_lo),
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THUNK_TARGET(hv_hypercall_pg)
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: "cc", "memory");
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#endif /* !x86_64 */
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return hv_status;
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}
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/* Hypercall to the L0 hypervisor */
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static inline u64 hv_do_nested_hypercall(u64 control, void *input, void *output)
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{
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return hv_do_hypercall(control | HV_HYPERCALL_NESTED, input, output);
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}
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/* Fast hypercall with 8 bytes of input and no output */
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static inline u64 _hv_do_fast_hypercall8(u64 control, u64 input1)
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{
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u64 hv_status;
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#ifdef CONFIG_X86_64
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{
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__asm__ __volatile__(CALL_NOSPEC
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: "=a" (hv_status), ASM_CALL_CONSTRAINT,
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"+c" (control), "+d" (input1)
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: THUNK_TARGET(hv_hypercall_pg)
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: "cc", "r8", "r9", "r10", "r11");
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}
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#else
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{
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u32 input1_hi = upper_32_bits(input1);
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u32 input1_lo = lower_32_bits(input1);
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__asm__ __volatile__ (CALL_NOSPEC
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: "=A"(hv_status),
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"+c"(input1_lo),
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ASM_CALL_CONSTRAINT
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: "A" (control),
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"b" (input1_hi),
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THUNK_TARGET(hv_hypercall_pg)
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: "cc", "edi", "esi");
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}
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#endif
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return hv_status;
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}
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static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
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{
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u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
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return _hv_do_fast_hypercall8(control, input1);
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}
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static inline u64 hv_do_fast_nested_hypercall8(u16 code, u64 input1)
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{
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u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED;
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return _hv_do_fast_hypercall8(control, input1);
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}
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/* Fast hypercall with 16 bytes of input */
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static inline u64 _hv_do_fast_hypercall16(u64 control, u64 input1, u64 input2)
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{
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u64 hv_status;
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#ifdef CONFIG_X86_64
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{
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__asm__ __volatile__("mov %4, %%r8\n"
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CALL_NOSPEC
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: "=a" (hv_status), ASM_CALL_CONSTRAINT,
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"+c" (control), "+d" (input1)
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: "r" (input2),
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THUNK_TARGET(hv_hypercall_pg)
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: "cc", "r8", "r9", "r10", "r11");
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}
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#else
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{
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u32 input1_hi = upper_32_bits(input1);
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u32 input1_lo = lower_32_bits(input1);
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u32 input2_hi = upper_32_bits(input2);
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u32 input2_lo = lower_32_bits(input2);
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__asm__ __volatile__ (CALL_NOSPEC
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: "=A"(hv_status),
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"+c"(input1_lo), ASM_CALL_CONSTRAINT
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: "A" (control), "b" (input1_hi),
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"D"(input2_hi), "S"(input2_lo),
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THUNK_TARGET(hv_hypercall_pg)
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: "cc");
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}
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#endif
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return hv_status;
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}
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static inline u64 hv_do_fast_hypercall16(u16 code, u64 input1, u64 input2)
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{
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u64 control = (u64)code | HV_HYPERCALL_FAST_BIT;
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return _hv_do_fast_hypercall16(control, input1, input2);
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}
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static inline u64 hv_do_fast_nested_hypercall16(u16 code, u64 input1, u64 input2)
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{
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u64 control = (u64)code | HV_HYPERCALL_FAST_BIT | HV_HYPERCALL_NESTED;
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return _hv_do_fast_hypercall16(control, input1, input2);
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}
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extern struct hv_vp_assist_page **hv_vp_assist_page;
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static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
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{
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if (!hv_vp_assist_page)
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return NULL;
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return hv_vp_assist_page[cpu];
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}
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void __init hyperv_init(void);
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void hyperv_setup_mmu_ops(void);
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void set_hv_tscchange_cb(void (*cb)(void));
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void clear_hv_tscchange_cb(void);
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void hyperv_stop_tsc_emulation(void);
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int hyperv_flush_guest_mapping(u64 as);
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int hyperv_flush_guest_mapping_range(u64 as,
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hyperv_fill_flush_list_func fill_func, void *data);
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int hyperv_fill_flush_guest_mapping_list(
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struct hv_guest_mapping_flush_list *flush,
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u64 start_gfn, u64 end_gfn);
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#ifdef CONFIG_X86_64
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void hv_apic_init(void);
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void __init hv_init_spinlocks(void);
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bool hv_vcpu_is_preempted(int vcpu);
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#else
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static inline void hv_apic_init(void) {}
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#endif
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struct irq_domain *hv_create_pci_msi_domain(void);
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int hv_map_ioapic_interrupt(int ioapic_id, bool level, int vcpu, int vector,
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struct hv_interrupt_entry *entry);
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int hv_unmap_ioapic_interrupt(int ioapic_id, struct hv_interrupt_entry *entry);
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#ifdef CONFIG_AMD_MEM_ENCRYPT
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void hv_ghcb_msr_write(u64 msr, u64 value);
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void hv_ghcb_msr_read(u64 msr, u64 *value);
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bool hv_ghcb_negotiate_protocol(void);
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void __noreturn hv_ghcb_terminate(unsigned int set, unsigned int reason);
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void hv_vtom_init(void);
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#else
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static inline void hv_ghcb_msr_write(u64 msr, u64 value) {}
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static inline void hv_ghcb_msr_read(u64 msr, u64 *value) {}
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static inline bool hv_ghcb_negotiate_protocol(void) { return false; }
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static inline void hv_ghcb_terminate(unsigned int set, unsigned int reason) {}
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static inline void hv_vtom_init(void) {}
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#endif
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extern bool hv_isolation_type_snp(void);
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static inline bool hv_is_synic_reg(unsigned int reg)
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{
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return (reg >= HV_REGISTER_SCONTROL) &&
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(reg <= HV_REGISTER_SINT15);
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}
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static inline bool hv_is_sint_reg(unsigned int reg)
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{
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return (reg >= HV_REGISTER_SINT0) &&
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(reg <= HV_REGISTER_SINT15);
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}
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u64 hv_get_register(unsigned int reg);
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void hv_set_register(unsigned int reg, u64 value);
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u64 hv_get_non_nested_register(unsigned int reg);
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void hv_set_non_nested_register(unsigned int reg, u64 value);
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static __always_inline u64 hv_raw_get_register(unsigned int reg)
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{
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return __rdmsr(reg);
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}
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#else /* CONFIG_HYPERV */
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static inline void hyperv_init(void) {}
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static inline void hyperv_setup_mmu_ops(void) {}
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static inline void set_hv_tscchange_cb(void (*cb)(void)) {}
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static inline void clear_hv_tscchange_cb(void) {}
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static inline void hyperv_stop_tsc_emulation(void) {};
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static inline struct hv_vp_assist_page *hv_get_vp_assist_page(unsigned int cpu)
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{
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return NULL;
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}
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static inline int hyperv_flush_guest_mapping(u64 as) { return -1; }
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static inline int hyperv_flush_guest_mapping_range(u64 as,
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hyperv_fill_flush_list_func fill_func, void *data)
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{
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return -1;
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}
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static inline void hv_set_register(unsigned int reg, u64 value) { }
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static inline u64 hv_get_register(unsigned int reg) { return 0; }
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static inline void hv_set_non_nested_register(unsigned int reg, u64 value) { }
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static inline u64 hv_get_non_nested_register(unsigned int reg) { return 0; }
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#endif /* CONFIG_HYPERV */
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#ifdef CONFIG_HYPERV_VTL_MODE
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void __init hv_vtl_init_platform(void);
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#else
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static inline void __init hv_vtl_init_platform(void) {}
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#endif
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#include <asm-generic/mshyperv.h>
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#endif
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