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arch: x86_64: allow more than 2 E820_RAM ranges

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The 'generate_ram_ranges' function currently hardcodes the assumption
that there are only 2 E820 RAM entries. This is not flexible enough to
handle vendor specific memory holes. Returning a Vec is also more
convenient for users of this function.

Signed-off-by: Thomas Barrett <tbarrett@crusoeenergy.com>
This commit is contained in:
Thomas Barrett 2024-02-14 20:58:38 +00:00 committed by Rob Bradford
parent bcdd23956f
commit ce7db3f7c3
2 changed files with 22 additions and 62 deletions
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73
arch/src/x86_64/mod.rs
View File

@ -934,12 +934,7 @@ type RamRange = (u64, u64);
/// Returns usable physical memory ranges for the guest
/// These should be used to create e820_RAM memory maps
///
/// There are up to two usable physical memory ranges,
/// divided by the gap at the end of 32bit address space.
pub fn generate_ram_ranges(
guest_mem: &GuestMemoryMmap,
) -> super::Result<(RamRange, Option<RamRange>)> {
pub fn generate_ram_ranges(guest_mem: &GuestMemoryMmap) -> super::Result<Vec<RamRange>> {
// Merge continuous memory regions into one region.
// Note: memory regions from "GuestMemory" are sorted and non-zero sized.
let ram_regions = {
@ -972,15 +967,11 @@ pub fn generate_ram_ranges(
ram_regions
};
if ram_regions.len() > 2 {
error!(
"There should be up to two usable physical memory ranges, devidided by the
gap at the end of 32bit address space (e.g. between 3G and 4G)."
);
return Err(super::Error::MemmapTableSetup);
}
// Create the memory map entry for memory region before the gap
let mut ram_ranges = vec![];
// Generate the first usable physical memory range before the gap
// Generate the first usable physical memory range before the gap. The e820 map
// should only report memory above 1MiB.
let first_ram_range = {
let (first_region_start, first_region_end) =
ram_regions.first().ok_or(super::Error::MemmapTableSetup)?;
@ -1007,33 +998,19 @@ pub fn generate_ram_ranges(
(high_ram_start, *first_region_end)
};
ram_ranges.push(first_ram_range);
// Generate the second usable physical memory range after the gap if any
let second_ram_range = if let Some((second_region_start, second_region_end)) =
ram_regions.get(1)
{
let ram_64bit_start = layout::RAM_64BIT_START.raw_value();
if second_region_start != &ram_64bit_start {
error!(
"Unexpected second memory region layout: start: 0x{:08x}, ram_64bit_start: 0x{:08x}",
second_region_start, ram_64bit_start
);
return Err(super::Error::MemmapTableSetup);
}
// Generate additional usable physical memory range after the gap if any.
for ram_region in ram_regions.iter().skip(1) {
info!(
"Second usable physical memory range, start: 0x{:08x}, end: 0x{:08x}",
ram_64bit_start, second_region_end
"found usable physical memory range, start: 0x{:08x}, end: 0x{:08x}",
ram_region.0, ram_region.1
);
Some((ram_64bit_start, *second_region_end))
} else {
None
};
ram_ranges.push(*ram_region);
}
Ok((first_ram_range, second_ram_range))
Ok(ram_ranges)
}
fn configure_pvh(
@ -1084,30 +1061,18 @@ fn configure_pvh(
add_memmap_entry(&mut memmap, 0, layout::EBDA_START.raw_value(), E820_RAM);
// Get usable physical memory ranges
let (first_ram_range, second_ram_range) = generate_ram_ranges(guest_mem)?;
let ram_ranges = generate_ram_ranges(guest_mem)?;
// Create e820 memory map entry before the gap
info!(
"create_memmap_entry, start: 0x{:08x}, end: 0x{:08x}",
first_ram_range.0, first_ram_range.1
);
add_memmap_entry(
&mut memmap,
first_ram_range.0,
first_ram_range.1 - first_ram_range.0,
E820_RAM,
);
// Create e820 memory map after the gap if any
if let Some(second_ram_range) = second_ram_range {
// Create e820 memory map entries
for ram_range in ram_ranges {
info!(
"create_memmap_entry, start: 0x{:08x}, end: 0x{:08x}",
second_ram_range.0, second_ram_range.1
ram_range.0, ram_range.1
);
add_memmap_entry(
&mut memmap,
second_ram_range.0,
second_ram_range.1 - second_ram_range.0,
ram_range.0,
ram_range.1 - ram_range.0,
E820_RAM,
);
}

11
vmm/src/igvm/igvm_loader.rs
View File

@ -92,15 +92,10 @@ fn generate_memory_map(
let mut memory_map = Vec::new();
// Get usable physical memory ranges
let (first_ram_range, second_ram_range) =
arch::generate_ram_ranges(guest_mem).map_err(Error::InvalidGuestMemmap)?;
let ram_ranges = arch::generate_ram_ranges(guest_mem).map_err(Error::InvalidGuestMemmap)?;
// Create the memory map entry for memory region before the gap
memory_map.push(igvm_memmap_from_ram_range(first_ram_range));
// Create the memory map entry for memory region after the gap if any
if let Some(second_ram_range) = second_ram_range {
memory_map.push(igvm_memmap_from_ram_range(second_ram_range));
for ram_range in ram_ranges {
memory_map.push(igvm_memmap_from_ram_range(ram_range));
}
Ok(memory_map)