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arch: x86_64: Create MP table after SMBIOS table if space

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In order to speed up the Linux boot (so as to avoid it having to scan a
large number of pages) place the MP table directly after the SMBIOS
table if there is sufficient room. The start address of the SMBIOS table
is one of the three (and the largest) location that the MP table can
also be located at.

Before:
[    0.000399] x86/PAT: Configuration [0-7]: WB  WC  UC- UC  WB  WP  UC- WT
[    0.014945] check: Scanning 1 areas for low memory corruption

After:
[    0.000284] x86/PAT: Configuration [0-7]: WB  WC  UC- UC  WB  WP  UC- WT
[    0.000421] found SMP MP-table at [mem 0x000f0090-0x000f009f]

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
This commit is contained in:
Rob Bradford
2020-09-25 16:12:23 +01:00
committed by Sebastien Boeuf
parent 7e130a65ba
commit f762bc7573
3 changed files with 26 additions and 18 deletions
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arch/src/x86_64/mod.rs
+6 -6
View File
@@ -10,7 +10,6 @@ use std::sync::Arc;
mod gdt;
pub mod interrupts;
pub mod layout;
#[cfg(not(feature = "acpi"))]
mod mptable;
pub mod regs;
use crate::InitramfsConfig;
@@ -141,7 +140,7 @@ unsafe impl ByteValued for BootParamsWrapper {}
pub enum Error {
/// Invalid e820 setup params.
E820Configuration,
#[cfg(not(feature = "acpi"))]
/// Error writing MP table to memory.
MpTableSetup(mptable::Error),
@@ -487,11 +486,12 @@ pub fn configure_system(
boot_prot: BootProtocol,
sgx_epc_region: Option<SgxEpcRegion>,
) -> super::Result<()> {
smbios::setup_smbios(guest_mem).map_err(Error::SmbiosSetup)?;
let size = smbios::setup_smbios(guest_mem).map_err(Error::SmbiosSetup)?;
// Note that this puts the mptable at the last 1k of Linux's 640k base RAM
#[cfg(not(feature = "acpi"))]
mptable::setup_mptable(guest_mem, _num_cpus).map_err(Error::MpTableSetup)?;
// Place the MP table after the SMIOS table aligned to 16 bytes
let offset = GuestAddress(layout::SMBIOS_START).unchecked_add(size);
let offset = GuestAddress((offset.0 + 16) & !0xf);
mptable::setup_mptable(offset, guest_mem, _num_cpus).map_err(Error::MpTableSetup)?;
// Check that the RAM is not smaller than the RSDP start address
if let Some(rsdp_addr) = rsdp_addr {