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arch: x86_64: bring back bzImage support

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Allow cloud-hypervisor to direct boot the bzImage kernel format using
the regular 32 bit entry point. This can share the memory and vcpu
setup with the regular PVH boot code, but requires the setup of the
'zero page'.

Signed-off-by: Stefan Nuernberger <stefan.nuernberger@cyberus-technology.de>
This commit is contained in:
Stefan Nuernberger
2024-02-09 17:35:29 +01:00
committed by Rob Bradford
parent da3693f164
commit 09cf8c3118
5 changed files with 289 additions and 29 deletions
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vmm/src/cpu.rs
+41 -2
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@@ -2715,9 +2715,12 @@ impl CpuElf64Writable for CpuManager {
#[cfg(all(feature = "kvm", target_arch = "x86_64"))]
#[cfg(test)]
mod tests {
use arch::layout::BOOT_STACK_POINTER;
use arch::layout::ZERO_PAGE_START;
use arch::x86_64::interrupts::*;
use arch::x86_64::regs::*;
use hypervisor::arch::x86::{FpuState, LapicState, StandardRegisters};
use linux_loader::loader::bootparam::setup_header;
#[test]
fn test_setlint() {
@@ -2796,7 +2799,7 @@ mod tests {
}
#[test]
fn test_setup_regs() {
fn test_setup_regs_for_pvh() {
let hv = hypervisor::new().unwrap();
let vm = hv.create_vm().expect("new VM fd creation failed");
let vcpu = vm.create_vcpu(0, None).unwrap();
@@ -2808,7 +2811,43 @@ mod tests {
..Default::default()
};
setup_regs(&vcpu, expected_regs.rip).unwrap();
setup_regs(
&vcpu,
arch::EntryPoint {
entry_addr: vm_memory::GuestAddress(expected_regs.rip),
setup_header: None,
},
)
.unwrap();
let actual_regs: StandardRegisters = vcpu.get_regs().unwrap();
assert_eq!(actual_regs, expected_regs);
}
#[test]
fn test_setup_regs_for_bzimage() {
let hv = hypervisor::new().unwrap();
let vm = hv.create_vm().expect("new VM fd creation failed");
let vcpu = vm.create_vcpu(0, None).unwrap();
let expected_regs: StandardRegisters = StandardRegisters {
rflags: 0x0000000000000002u64,
rip: 1,
rsp: BOOT_STACK_POINTER.0,
rsi: ZERO_PAGE_START.0,
..Default::default()
};
setup_regs(
&vcpu,
arch::EntryPoint {
entry_addr: vm_memory::GuestAddress(expected_regs.rip),
setup_header: Some(setup_header {
..Default::default()
}),
},
)
.unwrap();
let actual_regs: StandardRegisters = vcpu.get_regs().unwrap();
assert_eq!(actual_regs, expected_regs);