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vmm: arch: Make phys_bits functionality use CPU vendor API

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Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
This commit is contained in:
Anatol Belski
2023-05-30 14:42:55 +02:00
committed by Anatol Belski
parent 7df80220ec
commit 7bf2a2c382
5 changed files with 18 additions and 18 deletions
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7
arch/src/aarch64/mod.rs
View File

@@ -198,11 +198,8 @@ pub fn initramfs_load_addr(
}
}
pub fn get_host_cpu_phys_bits() -> u8 {
// A dummy hypervisor created only for querying the host IPA size and will
// be freed after the query.
let hv = hypervisor::new().unwrap();
let host_cpu_phys_bits = hv.get_host_ipa_limit().try_into().unwrap();
pub fn get_host_cpu_phys_bits(hypervisor: &Arc<dyn hypervisor::Hypervisor>) -> u8 {
let host_cpu_phys_bits = hypervisor.get_host_ipa_limit().try_into().unwrap();
if host_cpu_phys_bits == 0 {
// Host kernel does not support `get_host_ipa_limit`,
// we return the default value 40 here.

8
arch/src/x86_64/mod.rs
View File

@@ -16,7 +16,7 @@ use crate::GuestMemoryMmap;
use crate::InitramfsConfig;
use crate::RegionType;
use hypervisor::arch::x86::{CpuIdEntry, CPUID_FLAG_VALID_INDEX};
use hypervisor::{HypervisorCpuError, HypervisorError};
use hypervisor::{CpuVendor, HypervisorCpuError, HypervisorError};
use linux_loader::loader::bootparam::boot_params;
use linux_loader::loader::elf::start_info::{
hvm_memmap_table_entry, hvm_modlist_entry, hvm_start_info,
@@ -1078,7 +1078,7 @@ pub fn initramfs_load_addr(
Ok(aligned_addr)
}
pub fn get_host_cpu_phys_bits() -> u8 {
pub fn get_host_cpu_phys_bits(hypervisor: &Arc<dyn hypervisor::Hypervisor>) -> u8 {
// SAFETY: call cpuid with valid leaves
unsafe {
let leaf = x86_64::__cpuid(0x8000_0000);
@@ -1087,9 +1087,7 @@ pub fn get_host_cpu_phys_bits() -> u8 {
// Some physical address bits may become reserved when the feature is enabled.
// See AMD64 Architecture Programmer's Manual Volume 2, Section 7.10.1
let reduced = if leaf.eax >= 0x8000_001f
&& leaf.ebx == 0x6874_7541 // Vendor ID: AuthenticAMD
&& leaf.ecx == 0x444d_4163
&& leaf.edx == 0x6974_6e65
&& matches!(hypervisor.get_cpu_vendor(), CpuVendor::AMD)
&& x86_64::__cpuid(0x8000_001f).eax & 0x1 != 0
{
(x86_64::__cpuid(0x8000_001f).ebx >> 6) & 0x3f