Struct vm_memory::guest_memory::GuestAddress

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pub struct GuestAddress(pub u64);

Expand description

Represents a guest physical address (GPA).

§Notes:

On ARM64, a 32-bit hypervisor may be used to support a 64-bit guest. For simplicity, u64 is used to store the the raw value no matter if the guest a 32-bit or 64-bit virtual machine.

Tuple Fields§

§0: u64

Trait Implementations§

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impl Address for GuestAddress

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fn new(value: u64) -> GuestAddress

Creates an address from a raw address value.

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fn raw_value(&self) -> u64

Returns the raw value of the address.

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fn checked_offset_from(&self, base: GuestAddress) -> Option<u64>

Computes the offset from this address to the given base address. Read more

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fn checked_add(&self, other: u64) -> Option<GuestAddress>

Computes self + other, returning None if overflow occurred.

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fn overflowing_add(&self, other: u64) -> (GuestAddress, bool)

Computes self + other. Read more

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fn unchecked_add(&self, offset: u64) -> GuestAddress

Computes self + offset. Read more

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fn checked_sub(&self, other: u64) -> Option<GuestAddress>

Subtracts two addresses, checking for underflow. If underflow happens, None is returned.

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fn overflowing_sub(&self, other: u64) -> (GuestAddress, bool)

Computes self - other. Read more

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fn unchecked_sub(&self, other: u64) -> GuestAddress

Computes self - other. Read more

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fn mask(&self, mask: Self::V) -> Self::V

Returns the bitwise and of the address with the given mask.

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fn unchecked_offset_from(&self, base: Self) -> Self::V

Computes the offset from this address to the given base address. Read more

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fn checked_align_up(&self, power_of_two: Self::V) -> Option<Self>

Returns self, aligned to the given power of two.

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fn unchecked_align_up(&self, power_of_two: Self::V) -> Self

Returns self, aligned to the given power of two. Only use this when the result is guaranteed not to overflow.

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impl AddressValue for GuestAddress

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type V = u64

Type of the raw address value.

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fn zero() -> Self::V

Return the value zero, coerced into the value type Self::V

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fn one() -> Self::V

Return the value zero, coerced into the value type Self::V

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impl BitAnd<u64> for GuestAddress

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type Output = GuestAddress

The resulting type after applying the & operator.

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fn bitand(self, other: u64) -> GuestAddress

Performs the & operation. Read more

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impl BitOr<u64> for GuestAddress

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type Output = GuestAddress

The resulting type after applying the | operator.

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fn bitor(self, other: u64) -> GuestAddress

Performs the | operation. Read more

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impl Clone for GuestAddress

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fn clone(&self) -> GuestAddress

Returns a copy of the value. Read more

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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl Debug for GuestAddress

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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impl Default for GuestAddress

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fn default() -> GuestAddress

Returns the “default value” for a type. Read more

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impl Ord for GuestAddress

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fn cmp(&self, other: &GuestAddress) -> Ordering

This method returns an Ordering between self and other. Read more

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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more

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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more

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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more

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impl PartialEq for GuestAddress

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fn eq(&self, other: &GuestAddress) -> bool

This method tests for self and other values to be equal, and is used by ==.

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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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impl PartialOrd for GuestAddress

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fn partial_cmp(&self, other: &GuestAddress) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more

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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more

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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more

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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

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impl Copy for GuestAddress

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impl Eq for GuestAddress

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impl StructuralPartialEq for GuestAddress

Auto Trait Implementations§

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impl UnwindSafe for GuestAddress

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> Bytes<GuestAddress> for T
where T: GuestMemory + ?Sized,

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fn write_slice(&self, buf: &[u8], addr: GuestAddress) -> Result<(), Error>

§Examples

Write a slice at guestaddress 0x1000. (uses the backend-mmap feature)

gm.write_slice(&[1, 2, 3, 4, 5], start_addr)
    .expect("Could not write slice to guest memory");

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fn read_slice(&self, buf: &mut [u8], addr: GuestAddress) -> Result<(), Error>

§Examples

Read a slice of length 16 at guestaddress 0x1000. (uses the backend-mmap feature)

let start_addr = GuestAddress(0x1000);
let mut gm = GuestMemoryMmap::<()>::from_ranges(&vec![(start_addr, 0x400)])
    .expect("Could not create guest memory");
let buf = &mut [0u8; 16];

gm.read_slice(buf, start_addr)
    .expect("Could not read slice from guest memory");

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fn read_from<F>( &self, addr: GuestAddress, src: &mut F, count: usize, ) -> Result<usize, Error>
where F: Read,

§Examples

Read bytes from /dev/urandom (uses the backend-mmap feature)

let mut file = File::open(Path::new("/dev/urandom")).expect("Could not open /dev/urandom");

gm.read_from(addr, &mut file, 128)
    .expect("Could not read from /dev/urandom into guest memory");

let read_addr = addr.checked_add(8).expect("Could not compute read address");
let rand_val: u32 = gm
    .read_obj(read_addr)
    .expect("Could not read u32 val from /dev/urandom");

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fn write_to<F>( &self, addr: GuestAddress, dst: &mut F, count: usize, ) -> Result<usize, Error>
where F: Write,

§Examples

Write 128 bytes to /dev/null (uses the backend-mmap feature)

let mut file = OpenOptions::new()
    .write(true)
    .open("/dev/null")
    .expect("Could not open /dev/null");

gm.write_to(start_addr, &mut file, 128)
    .expect("Could not write 128 bytes to the provided address");

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fn write_all_to<F>( &self, addr: GuestAddress, dst: &mut F, count: usize, ) -> Result<(), Error>
where F: Write,

§Examples

Write 128 bytes to /dev/null (uses the backend-mmap feature)

let mut file = OpenOptions::new()
    .write(true)
    .open("/dev/null")
    .expect("Could not open /dev/null");

gm.write_all_to(start_addr, &mut file, 128)
    .expect("Could not write 128 bytes to the provided address");

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