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arch, vmm: Place KVM identity map region after TSS region

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In order to avoid the identity map region to conflict with a possible
firmware being placed in the last 4MiB of the 4GiB range, we must set
the address to a chosen location. And it makes the most sense to have
this region placed right after the TSS region.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2021-12-04 13:59:11 +01:00
committed by Rob Bradford
parent c452471c4e
commit 03a606c7ec
3 changed files with 13 additions and 1 deletions
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4
arch/src/x86_64/layout.rs
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@@ -98,6 +98,10 @@ pub const PCI_MMCONFIG_SIZE: u64 = 256 << 20;
pub const KVM_TSS_START: GuestAddress = GuestAddress(PCI_MMCONFIG_START.0 + PCI_MMCONFIG_SIZE);
pub const KVM_TSS_SIZE: u64 = (3 * 4) << 10;
// Identity map is a one page region after the TSS
pub const KVM_IDENTITY_MAP_START: GuestAddress = GuestAddress(KVM_TSS_START.0 + KVM_TSS_SIZE);
pub const KVM_IDENTITY_MAP_SIZE: u64 = 4 << 10;
// IOAPIC
pub const IOAPIC_START: GuestAddress = GuestAddress(0xfec0_0000);
pub const IOAPIC_SIZE: u64 = 0x20;