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arch: x86_64: Only reserve used 32-bit address space

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Reduce the size of the reserved 32-bit address space to the range used
by both the PCI MMIO config data and the 32-bit PCI device space.

This avoids issues when using firmware that is loaded into the very top
of the 32-bit address space as the RAM conflicts with the reserved
memory.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford 2021-12-02 14:19:22 +00:00 committed by Sebastien Boeuf
parent 8f4de45937
commit 4f4eb3f6b8
1 changed files with 2 additions and 2 deletions
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4
arch/src/x86_64/layout.rs
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@ -79,9 +79,9 @@ pub const HIGH_RAM_START: GuestAddress = GuestAddress(0x100000);
// == No fixed addresses in the "High RAM" range ==
// ** 32-bit reserved area (start: 3GiB, length: 1GiB) **
// ** 32-bit reserved area (start: 3GiB, length: 896MiB) **
pub const MEM_32BIT_RESERVED_START: GuestAddress = GuestAddress(0xc000_0000);
pub const MEM_32BIT_RESERVED_SIZE: u64 = 1024 << 20;
pub const MEM_32BIT_RESERVED_SIZE: u64 = PCI_MMCONFIG_SIZE + MEM_32BIT_DEVICES_SIZE;
// == Fixed constants within the "32-bit reserved" range ==