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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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8
vmm/src/vm.rs
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@@ -32,7 +32,7 @@ use crate::{
use anyhow::anyhow;
use arch::get_host_cpu_phys_bits;
#[cfg(target_arch = "x86_64")]
use arch::layout::KVM_TSS_START;
use arch::layout::{KVM_IDENTITY_MAP_START, KVM_TSS_START};
#[cfg(all(feature = "tdx", feature = "acpi"))]
use arch::x86_64::tdx::TdVmmDataRegionType;
#[cfg(feature = "tdx")]
@@ -756,6 +756,8 @@ impl Vm {
#[cfg(target_arch = "x86_64")]
{
vm.set_identity_map_address(KVM_IDENTITY_MAP_START.0)
.unwrap();
vm.set_tss_address(KVM_TSS_START.0 as usize).unwrap();
vm.enable_split_irq().unwrap();
}
@@ -819,6 +821,8 @@ impl Vm {
#[cfg(target_arch = "x86_64")]
{
vm.set_identity_map_address(KVM_IDENTITY_MAP_START.0)
.unwrap();
vm.set_tss_address(KVM_TSS_START.0 as usize).unwrap();
vm.enable_split_irq().unwrap();
}
@@ -878,6 +882,8 @@ impl Vm {
#[cfg(target_arch = "x86_64")]
{
vm.set_identity_map_address(KVM_IDENTITY_MAP_START.0)
.unwrap();
vm.set_tss_address(KVM_TSS_START.0 as usize).unwrap();
vm.enable_split_irq().unwrap();
}