381 lines
11 KiB
C
381 lines
11 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef _ASM_X86_MSHYPER_H
|
||
|
|
#define _ASM_X86_MSHYPER_H
|
||
|
|
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/atomic.h>
|
||
|
|
#include <linux/nmi.h>
|
||
|
|
#include <asm/io.h>
|
||
|
|
#include <asm/hyperv.h>
|
||
|
|
#include <asm/nospec-branch.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
|
||
|
|
* is set by CPUID(HVCPUID_VERSION_FEATURES).
|
||
|
|
*/
|
||
|
|
enum hv_cpuid_function {
|
||
|
|
HVCPUID_VERSION_FEATURES = 0x00000001,
|
||
|
|
HVCPUID_VENDOR_MAXFUNCTION = 0x40000000,
|
||
|
|
HVCPUID_INTERFACE = 0x40000001,
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The remaining functions depend on the value of
|
||
|
|
* HVCPUID_INTERFACE
|
||
|
|
*/
|
||
|
|
HVCPUID_VERSION = 0x40000002,
|
||
|
|
HVCPUID_FEATURES = 0x40000003,
|
||
|
|
HVCPUID_ENLIGHTENMENT_INFO = 0x40000004,
|
||
|
|
HVCPUID_IMPLEMENTATION_LIMITS = 0x40000005,
|
||
|
|
};
|
||
|
|
|
||
|
|
struct ms_hyperv_info {
|
||
|
|
u32 features;
|
||
|
|
u32 misc_features;
|
||
|
|
u32 hints;
|
||
|
|
u32 max_vp_index;
|
||
|
|
u32 max_lp_index;
|
||
|
|
};
|
||
|
|
|
||
|
|
extern struct ms_hyperv_info ms_hyperv;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Declare the MSR used to setup pages used to communicate with the hypervisor.
|
||
|
|
*/
|
||
|
|
union hv_x64_msr_hypercall_contents {
|
||
|
|
u64 as_uint64;
|
||
|
|
struct {
|
||
|
|
u64 enable:1;
|
||
|
|
u64 reserved:11;
|
||
|
|
u64 guest_physical_address:52;
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* TSC page layout.
|
||
|
|
*/
|
||
|
|
|
||
|
|
struct ms_hyperv_tsc_page {
|
||
|
|
volatile u32 tsc_sequence;
|
||
|
|
u32 reserved1;
|
||
|
|
volatile u64 tsc_scale;
|
||
|
|
volatile s64 tsc_offset;
|
||
|
|
u64 reserved2[509];
|
||
|
|
};
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The guest OS needs to register the guest ID with the hypervisor.
|
||
|
|
* The guest ID is a 64 bit entity and the structure of this ID is
|
||
|
|
* specified in the Hyper-V specification:
|
||
|
|
*
|
||
|
|
* msdn.microsoft.com/en-us/library/windows/hardware/ff542653%28v=vs.85%29.aspx
|
||
|
|
*
|
||
|
|
* While the current guideline does not specify how Linux guest ID(s)
|
||
|
|
* need to be generated, our plan is to publish the guidelines for
|
||
|
|
* Linux and other guest operating systems that currently are hosted
|
||
|
|
* on Hyper-V. The implementation here conforms to this yet
|
||
|
|
* unpublished guidelines.
|
||
|
|
*
|
||
|
|
*
|
||
|
|
* Bit(s)
|
||
|
|
* 63 - Indicates if the OS is Open Source or not; 1 is Open Source
|
||
|
|
* 62:56 - Os Type; Linux is 0x100
|
||
|
|
* 55:48 - Distro specific identification
|
||
|
|
* 47:16 - Linux kernel version number
|
||
|
|
* 15:0 - Distro specific identification
|
||
|
|
*
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define HV_LINUX_VENDOR_ID 0x8100
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Generate the guest ID based on the guideline described above.
|
||
|
|
*/
|
||
|
|
|
||
|
|
static inline __u64 generate_guest_id(__u64 d_info1, __u64 kernel_version,
|
||
|
|
__u64 d_info2)
|
||
|
|
{
|
||
|
|
__u64 guest_id = 0;
|
||
|
|
|
||
|
|
guest_id = (((__u64)HV_LINUX_VENDOR_ID) << 48);
|
||
|
|
guest_id |= (d_info1 << 48);
|
||
|
|
guest_id |= (kernel_version << 16);
|
||
|
|
guest_id |= d_info2;
|
||
|
|
|
||
|
|
return guest_id;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Free the message slot and signal end-of-message if required */
|
||
|
|
static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* On crash we're reading some other CPU's message page and we need
|
||
|
|
* to be careful: this other CPU may already had cleared the header
|
||
|
|
* and the host may already had delivered some other message there.
|
||
|
|
* In case we blindly write msg->header.message_type we're going
|
||
|
|
* to lose it. We can still lose a message of the same type but
|
||
|
|
* we count on the fact that there can only be one
|
||
|
|
* CHANNELMSG_UNLOAD_RESPONSE and we don't care about other messages
|
||
|
|
* on crash.
|
||
|
|
*/
|
||
|
|
if (cmpxchg(&msg->header.message_type, old_msg_type,
|
||
|
|
HVMSG_NONE) != old_msg_type)
|
||
|
|
return;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Make sure the write to MessageType (ie set to
|
||
|
|
* HVMSG_NONE) happens before we read the
|
||
|
|
* MessagePending and EOMing. Otherwise, the EOMing
|
||
|
|
* will not deliver any more messages since there is
|
||
|
|
* no empty slot
|
||
|
|
*/
|
||
|
|
mb();
|
||
|
|
|
||
|
|
if (msg->header.message_flags.msg_pending) {
|
||
|
|
/*
|
||
|
|
* This will cause message queue rescan to
|
||
|
|
* possibly deliver another msg from the
|
||
|
|
* hypervisor
|
||
|
|
*/
|
||
|
|
wrmsrl(HV_X64_MSR_EOM, 0);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#define hv_init_timer(timer, tick) wrmsrl(timer, tick)
|
||
|
|
#define hv_init_timer_config(config, val) wrmsrl(config, val)
|
||
|
|
|
||
|
|
#define hv_get_simp(val) rdmsrl(HV_X64_MSR_SIMP, val)
|
||
|
|
#define hv_set_simp(val) wrmsrl(HV_X64_MSR_SIMP, val)
|
||
|
|
|
||
|
|
#define hv_get_siefp(val) rdmsrl(HV_X64_MSR_SIEFP, val)
|
||
|
|
#define hv_set_siefp(val) wrmsrl(HV_X64_MSR_SIEFP, val)
|
||
|
|
|
||
|
|
#define hv_get_synic_state(val) rdmsrl(HV_X64_MSR_SCONTROL, val)
|
||
|
|
#define hv_set_synic_state(val) wrmsrl(HV_X64_MSR_SCONTROL, val)
|
||
|
|
|
||
|
|
#define hv_get_vp_index(index) rdmsrl(HV_X64_MSR_VP_INDEX, index)
|
||
|
|
|
||
|
|
#define hv_get_synint_state(int_num, val) rdmsrl(int_num, val)
|
||
|
|
#define hv_set_synint_state(int_num, val) wrmsrl(int_num, val)
|
||
|
|
|
||
|
|
void hyperv_callback_vector(void);
|
||
|
|
#ifdef CONFIG_TRACING
|
||
|
|
#define trace_hyperv_callback_vector hyperv_callback_vector
|
||
|
|
#endif
|
||
|
|
void hyperv_vector_handler(struct pt_regs *regs);
|
||
|
|
void hv_setup_vmbus_irq(void (*handler)(void));
|
||
|
|
void hv_remove_vmbus_irq(void);
|
||
|
|
|
||
|
|
void hv_setup_kexec_handler(void (*handler)(void));
|
||
|
|
void hv_remove_kexec_handler(void);
|
||
|
|
void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs));
|
||
|
|
void hv_remove_crash_handler(void);
|
||
|
|
|
||
|
|
#if IS_ENABLED(CONFIG_HYPERV)
|
||
|
|
extern struct clocksource *hyperv_cs;
|
||
|
|
extern void *hv_hypercall_pg;
|
||
|
|
|
||
|
|
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_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;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define HV_HYPERCALL_RESULT_MASK GENMASK_ULL(15, 0)
|
||
|
|
#define HV_HYPERCALL_FAST_BIT BIT(16)
|
||
|
|
#define HV_HYPERCALL_VARHEAD_OFFSET 17
|
||
|
|
#define HV_HYPERCALL_REP_COMP_OFFSET 32
|
||
|
|
#define HV_HYPERCALL_REP_COMP_MASK GENMASK_ULL(43, 32)
|
||
|
|
#define HV_HYPERCALL_REP_START_OFFSET 48
|
||
|
|
#define HV_HYPERCALL_REP_START_MASK GENMASK_ULL(59, 48)
|
||
|
|
|
||
|
|
/* Fast hypercall with 8 bytes of input and no output */
|
||
|
|
static inline u64 hv_do_fast_hypercall8(u16 code, u64 input1)
|
||
|
|
{
|
||
|
|
u64 hv_status, control = (u64)code | HV_HYPERCALL_FAST_BIT;
|
||
|
|
|
||
|
|
#ifdef CONFIG_X86_64
|
||
|
|
{
|
||
|
|
__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;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Rep hypercalls. Callers of this functions are supposed to ensure that
|
||
|
|
* rep_count and varhead_size comply with Hyper-V hypercall definition.
|
||
|
|
*/
|
||
|
|
static inline u64 hv_do_rep_hypercall(u16 code, u16 rep_count, u16 varhead_size,
|
||
|
|
void *input, void *output)
|
||
|
|
{
|
||
|
|
u64 control = code;
|
||
|
|
u64 status;
|
||
|
|
u16 rep_comp;
|
||
|
|
|
||
|
|
control |= (u64)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET;
|
||
|
|
control |= (u64)rep_count << HV_HYPERCALL_REP_COMP_OFFSET;
|
||
|
|
|
||
|
|
do {
|
||
|
|
status = hv_do_hypercall(control, input, output);
|
||
|
|
if ((status & HV_HYPERCALL_RESULT_MASK) != HV_STATUS_SUCCESS)
|
||
|
|
return status;
|
||
|
|
|
||
|
|
/* Bits 32-43 of status have 'Reps completed' data. */
|
||
|
|
rep_comp = (status & HV_HYPERCALL_REP_COMP_MASK) >>
|
||
|
|
HV_HYPERCALL_REP_COMP_OFFSET;
|
||
|
|
|
||
|
|
control &= ~HV_HYPERCALL_REP_START_MASK;
|
||
|
|
control |= (u64)rep_comp << HV_HYPERCALL_REP_START_OFFSET;
|
||
|
|
|
||
|
|
touch_nmi_watchdog();
|
||
|
|
} while (rep_comp < rep_count);
|
||
|
|
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Hypervisor's notion of virtual processor ID is different from
|
||
|
|
* Linux' notion of CPU ID. This information can only be retrieved
|
||
|
|
* in the context of the calling CPU. Setup a map for easy access
|
||
|
|
* to this information.
|
||
|
|
*/
|
||
|
|
extern u32 *hv_vp_index;
|
||
|
|
extern u32 hv_max_vp_index;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* hv_cpu_number_to_vp_number() - Map CPU to VP.
|
||
|
|
* @cpu_number: CPU number in Linux terms
|
||
|
|
*
|
||
|
|
* This function returns the mapping between the Linux processor
|
||
|
|
* number and the hypervisor's virtual processor number, useful
|
||
|
|
* in making hypercalls and such that talk about specific
|
||
|
|
* processors.
|
||
|
|
*
|
||
|
|
* Return: Virtual processor number in Hyper-V terms
|
||
|
|
*/
|
||
|
|
static inline int hv_cpu_number_to_vp_number(int cpu_number)
|
||
|
|
{
|
||
|
|
return hv_vp_index[cpu_number];
|
||
|
|
}
|
||
|
|
|
||
|
|
void hyperv_init(void);
|
||
|
|
void hyperv_setup_mmu_ops(void);
|
||
|
|
void hyper_alloc_mmu(void);
|
||
|
|
void hyperv_report_panic(struct pt_regs *regs, long err);
|
||
|
|
bool hv_is_hypercall_page_setup(void);
|
||
|
|
void hyperv_cleanup(void);
|
||
|
|
#else /* CONFIG_HYPERV */
|
||
|
|
static inline void hyperv_init(void) {}
|
||
|
|
static inline bool hv_is_hypercall_page_setup(void) { return false; }
|
||
|
|
static inline void hyperv_cleanup(void) {}
|
||
|
|
static inline void hyperv_setup_mmu_ops(void) {}
|
||
|
|
#endif /* CONFIG_HYPERV */
|
||
|
|
|
||
|
|
#ifdef CONFIG_HYPERV_TSCPAGE
|
||
|
|
struct ms_hyperv_tsc_page *hv_get_tsc_page(void);
|
||
|
|
static inline u64 hv_read_tsc_page(const struct ms_hyperv_tsc_page *tsc_pg)
|
||
|
|
{
|
||
|
|
u64 scale, offset, cur_tsc;
|
||
|
|
u32 sequence;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The protocol for reading Hyper-V TSC page is specified in Hypervisor
|
||
|
|
* Top-Level Functional Specification ver. 3.0 and above. To get the
|
||
|
|
* reference time we must do the following:
|
||
|
|
* - READ ReferenceTscSequence
|
||
|
|
* A special '0' value indicates the time source is unreliable and we
|
||
|
|
* need to use something else. The currently published specification
|
||
|
|
* versions (up to 4.0b) contain a mistake and wrongly claim '-1'
|
||
|
|
* instead of '0' as the special value, see commit c35b82ef0294.
|
||
|
|
* - ReferenceTime =
|
||
|
|
* ((RDTSC() * ReferenceTscScale) >> 64) + ReferenceTscOffset
|
||
|
|
* - READ ReferenceTscSequence again. In case its value has changed
|
||
|
|
* since our first reading we need to discard ReferenceTime and repeat
|
||
|
|
* the whole sequence as the hypervisor was updating the page in
|
||
|
|
* between.
|
||
|
|
*/
|
||
|
|
do {
|
||
|
|
sequence = READ_ONCE(tsc_pg->tsc_sequence);
|
||
|
|
if (!sequence)
|
||
|
|
return U64_MAX;
|
||
|
|
/*
|
||
|
|
* Make sure we read sequence before we read other values from
|
||
|
|
* TSC page.
|
||
|
|
*/
|
||
|
|
smp_rmb();
|
||
|
|
|
||
|
|
scale = READ_ONCE(tsc_pg->tsc_scale);
|
||
|
|
offset = READ_ONCE(tsc_pg->tsc_offset);
|
||
|
|
cur_tsc = rdtsc_ordered();
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Make sure we read sequence after we read all other values
|
||
|
|
* from TSC page.
|
||
|
|
*/
|
||
|
|
smp_rmb();
|
||
|
|
|
||
|
|
} while (READ_ONCE(tsc_pg->tsc_sequence) != sequence);
|
||
|
|
|
||
|
|
return mul_u64_u64_shr(cur_tsc, scale, 64) + offset;
|
||
|
|
}
|
||
|
|
|
||
|
|
#else
|
||
|
|
static inline struct ms_hyperv_tsc_page *hv_get_tsc_page(void)
|
||
|
|
{
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
#endif
|