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xenclient: implement page claims for early low memory warning

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This commit is contained in:
Alex Zenla 2024-01-20 21:06:28 -08:00
parent 001c22fd69
commit 7d9652636f
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GPG Key ID: 067B238899B51269
3 changed files with 26 additions and 1 deletions
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24
xencall/src/lib.rs
View File

@ -10,7 +10,7 @@ use crate::sys::{
XEN_DOMCTL_GETDOMAININFO, XEN_DOMCTL_GETPAGEFRAMEINFO3, XEN_DOMCTL_GETVCPUCONTEXT, XEN_DOMCTL_GETDOMAININFO, XEN_DOMCTL_GETPAGEFRAMEINFO3, XEN_DOMCTL_GETVCPUCONTEXT,
XEN_DOMCTL_HYPERCALL_INIT, XEN_DOMCTL_INTERFACE_VERSION, XEN_DOMCTL_MAX_MEM, XEN_DOMCTL_HYPERCALL_INIT, XEN_DOMCTL_INTERFACE_VERSION, XEN_DOMCTL_MAX_MEM,
XEN_DOMCTL_MAX_VCPUS, XEN_DOMCTL_PAUSEDOMAIN, XEN_DOMCTL_SETVCPUCONTEXT, XEN_DOMCTL_MAX_VCPUS, XEN_DOMCTL_PAUSEDOMAIN, XEN_DOMCTL_SETVCPUCONTEXT,
XEN_DOMCTL_SET_ADDRESS_SIZE, XEN_DOMCTL_UNPAUSEDOMAIN, XEN_MEM_MEMORY_MAP, XEN_DOMCTL_SET_ADDRESS_SIZE, XEN_DOMCTL_UNPAUSEDOMAIN, XEN_MEM_CLAIM_PAGES, XEN_MEM_MEMORY_MAP,
XEN_MEM_POPULATE_PHYSMAP, XEN_MEM_POPULATE_PHYSMAP,
}; };
use libc::{c_int, mmap, usleep, MAP_FAILED, MAP_SHARED, PROT_READ, PROT_WRITE}; use libc::{c_int, mmap, usleep, MAP_FAILED, MAP_SHARED, PROT_READ, PROT_WRITE};
@ -644,6 +644,28 @@ impl XenCall {
Ok(extents) Ok(extents)
} }
pub fn claim_pages(&self, domid: u32, pages: u64) -> Result<(), XenCallError> {
trace!(
"memory fd={} claim_pages domid={} pages={}",
self.handle.as_raw_fd(),
domid,
pages
);
let mut reservation = MemoryReservation {
extent_start: 0,
nr_extents: pages,
extent_order: 0,
mem_flags: 0,
domid: domid as u16,
};
self.hypercall2(
HYPERVISOR_MEMORY_OP,
XEN_MEM_CLAIM_PAGES as c_ulong,
addr_of_mut!(reservation) as c_ulong,
)?;
Ok(())
}
pub fn mmuext( pub fn mmuext(
&self, &self,
domid: u32, domid: u32,

1
xencall/src/sys.rs
View File

@ -365,6 +365,7 @@ pub struct MultiCallEntry {
pub const XEN_MEM_POPULATE_PHYSMAP: u32 = 6; pub const XEN_MEM_POPULATE_PHYSMAP: u32 = 6;
pub const XEN_MEM_MEMORY_MAP: u32 = 9; pub const XEN_MEM_MEMORY_MAP: u32 = 9;
pub const XEN_MEM_CLAIM_PAGES: u32 = 24;
#[repr(C)] #[repr(C)]
#[derive(Copy, Clone, Debug)] #[derive(Copy, Clone, Debug)]

2
xenclient/src/x86.rs
View File

@ -478,6 +478,7 @@ impl ArchBootSetup for X86BootSetup {
} }
fn meminit(&mut self, setup: &mut BootSetup, total_pages: u64) -> Result<(), XenClientError> { fn meminit(&mut self, setup: &mut BootSetup, total_pages: u64) -> Result<(), XenClientError> {
setup.call.claim_pages(setup.domid, total_pages)?;
let mut vmemranges: Vec<VmemRange> = Vec::new(); let mut vmemranges: Vec<VmemRange> = Vec::new();
let stub = VmemRange { let stub = VmemRange {
start: 0, start: 0,
@ -584,6 +585,7 @@ impl ArchBootSetup for X86BootSetup {
} }
setup.phys.load_p2m(p2m); setup.phys.load_p2m(p2m);
setup.call.claim_pages(setup.domid, 0)?;
Ok(()) Ok(())
} }