msr.h File Reference

Model Specific Register mnemonics and bit definitions. More...

#include <xtf/extable.h>
#include <xtf/types.h>
#include <xen/arch-x86/xen.h>
#include <arch/msr-index.h>

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Data Structures
union	msr_feature_control
union	msr_vmx_basic
struct	xtf_msr_consistency_test_data
struct	xtf_msr_consistency_test_data::xtf_msr_consistency_test_vals

Typedefs
typedef union msr_feature_control	msr_feature_control_t
typedef union msr_vmx_basic	msr_vmx_basic_t

Functions
static uint64_t	rdmsr (uint32_t idx)
	Thin wrapper around an rdmsr instruction. More...
static bool	rdmsr_safe (uint32_t idx, uint64_t *val)
	Wrapper around rdmsr which safely catches #GP[0]. More...
static void	wrmsr (uint32_t idx, uint64_t val)
	Thin wrapper around an wrmsr instruction. More...
static bool	wrmsr_safe (uint32_t idx, uint64_t val)
	Wrapper around wrmsr which safely catches #GP[0]. More...
void	xtf_msr_consistency_test (const struct xtf_msr_consistency_test_data *t)
	Run consistency tests as described by t. More...

Detailed Description

Model Specific Register mnemonics and bit definitions.

Misc C-level infrastructure for MSRs.

Definition in file msr.h.

Typedef Documentation

msr_feature_control_t

typedef union msr_feature_control msr_feature_control_t

msr_vmx_basic_t

typedef union msr_vmx_basic msr_vmx_basic_t

Function Documentation

rdmsr()

static uint64_t rdmsr ( uint32_t  idx )

inlinestatic

Thin wrapper around an rdmsr instruction.

May crash with #GP[0].

Definition at line 19 of file msr.h.

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rdmsr_safe()

static bool rdmsr_safe ( uint32_t  idx, uint64_t *  val  )

inlinestatic

Wrapper around rdmsr which safely catches #GP[0].

Parameters

	idx	MSR to read
[out]	val	Value, if no fault occurred.

Returns

boolean indicating whether the read faulted.

Definition at line 35 of file msr.h.

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wrmsr()

static void wrmsr ( uint32_t  idx, uint64_t  val  )

inlinestatic

Thin wrapper around an wrmsr instruction.

May crash with #GP[0].

Definition at line 55 of file msr.h.

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wrmsr_safe()

static bool wrmsr_safe ( uint32_t  idx, uint64_t  val  )

inlinestatic

Wrapper around wrmsr which safely catches #GP[0].

Parameters

idx	MSR to write
val	Value to write

Returns

boolean indicating whether the write faulted.

Definition at line 69 of file msr.h.

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xtf_msr_consistency_test()

void xtf_msr_consistency_test

(

const struct xtf_msr_consistency_test_data *

t

)

Run consistency tests as described by t.

Some MSRs may be passed directly through to guests for performance reasons. This introduces an extra level of complexity for context switching an emulation purposes.

To check that synchronisation is working properly, t describes an MSR and an array of predicated values. For each value where the predicate is true, mix regular and forced reads and writes to check that values written via one mechanism become visible via the other.

This logic is only applicable to read/write MSRs which expect to retain their written values on subsequent reads, and for values which will succeed when written.

Definition at line 29 of file msr.c.

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