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hypervisor: mshv: Add support to handle GPA Attribute Intercept

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Microsoft Hypervisor raises this request to change the guest page
visibility in case of SEV-SNP guest.

Signed-off-by: Jinank Jain <jinankjain@microsoft.com>
Signed-off-by: Nuno Das Neves <nudasnev@microsoft.com>
This commit is contained in:
Jinank Jain 2024-02-08 18:00:21 +05:30 committed by Bo Chen
parent fbcf5fb37d
commit da376a4b37
1 changed files with 55 additions and 0 deletions
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55
hypervisor/src/mshv/mod.rs
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@ -51,6 +51,8 @@ use crate::arch::x86::{CpuIdEntry, FpuState, MsrEntry};
const DIRTY_BITMAP_CLEAR_DIRTY: u64 = 0x4;
const DIRTY_BITMAP_SET_DIRTY: u64 = 0x8;
#[cfg(feature = "sev_snp")]
const HV_PAGE_SIZE: u64 = 4096;
///
/// Export generically-named wrappers of mshv-bindings for Unix-based platforms
@ -606,6 +608,59 @@ impl cpu::Vcpu for MshvVcpu {
Ok(cpu::VmExit::Ignore)
}
#[cfg(feature = "sev_snp")]
hv_message_type_HVMSG_GPA_ATTRIBUTE_INTERCEPT => {
let info = x.to_gpa_attribute_info().unwrap();
let host_vis = info.__bindgen_anon_1.host_visibility();
if host_vis >= HV_MAP_GPA_READABLE | HV_MAP_GPA_WRITABLE {
warn!("Ignored attribute intercept with full host visibility");
return Ok(cpu::VmExit::Ignore);
}
let num_ranges = info.__bindgen_anon_1.range_count();
assert!(num_ranges >= 1);
if num_ranges > 1 {
return Err(cpu::HypervisorCpuError::RunVcpu(anyhow!(
"Unhandled VCPU exit(GPA_ATTRIBUTE_INTERCEPT): Expected num_ranges to be 1 but found num_ranges {:?}",
num_ranges
)));
}
// TODO: we could also deny the request with HvCallCompleteIntercept
let mut gpas = Vec::new();
let ranges = info.ranges;
let (gfn_start, gfn_count) = snp::parse_gpa_range(ranges[0]).unwrap();
debug!(
"Releasing pages: gfn_start: {:x?}, gfn_count: {:?}",
gfn_start, gfn_count
);
let gpa_start = gfn_start * HV_PAGE_SIZE;
for i in 0..gfn_count {
gpas.push(gpa_start + i * HV_PAGE_SIZE);
}
let mut gpa_list =
vec_with_array_field::<mshv_modify_gpa_host_access, u64>(gpas.len());
gpa_list[0].gpa_list_size = gpas.len() as u64;
gpa_list[0].host_access = host_vis;
gpa_list[0].acquire = 0;
gpa_list[0].flags = 0;
// SAFETY: gpa_list initialized with gpas.len() and now it is being turned into
// gpas_slice with gpas.len() again. It is guaranteed to be large enough to hold
// everything from gpas.
unsafe {
let gpas_slice: &mut [u64] = gpa_list[0].gpa_list.as_mut_slice(gpas.len());
gpas_slice.copy_from_slice(gpas.as_slice());
}
self.vm_fd
.modify_gpa_host_access(&gpa_list[0])
.map_err(|e| cpu::HypervisorCpuError::RunVcpu(anyhow!(
"Unhandled VCPU exit: attribute intercept - couldn't modify host access {}", e
)))?;
Ok(cpu::VmExit::Ignore)
}
hv_message_type_HVMSG_UNACCEPTED_GPA => {
let info = x.to_memory_info().unwrap();
let gva = info.guest_virtual_address;