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runtime-rs: Add host-data property to sev-snp-guest object

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SEV-SNP guest configuration utilizes a different set of properties
compared to the existing 'sev-guest' object. This change introduces
the `host-data` property within the sev-snp-guest object. This property
allows for configuring an SEV-SNP guest with host-provided data, which
is crucial for data integrity verification during attestation.

The `host-data` property is specifically valid for SEV-SNP guests
running
on a capable platform. It is configured as a base64-encoded string when
using the sev-snp-guest object.

the example cmdline looks like:
```shell
   -object sev-snp-guest,id=sev-snp0,host-data=CGNkCHoBC5CcdGXir...
```

Fixes #11180

Signed-off-by: alex.lyn <alex.lyn@antgroup.com>
This commit is contained in:
alex.lyn 2025-06-13 17:37:26 +08:00
parent 4a4361393c
commit d6d8497b56
2 changed files with 15 additions and 5 deletions
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19
src/runtime-rs/crates/hypervisor/src/qemu/cmdline_generator.rs
View File

@ -1798,17 +1798,18 @@ struct ObjectSevSnpGuest {
cbitpos: u32,
reduced_phys_bits: u32,
kernel_hashes: bool,
host_data: Option<String>,
is_snp: bool,
}
impl ObjectSevSnpGuest {
fn new(is_snp: bool, cbitpos: u32) -> Self {
fn new(is_snp: bool, cbitpos: u32, host_data: Option<String>) -> Self {
ObjectSevSnpGuest {
id: (if is_snp { "snp" } else { "sev" }).to_owned(),
cbitpos,
reduced_phys_bits: 1,
kernel_hashes: true,
host_data,
is_snp,
}
}
@ -1834,6 +1835,9 @@ impl ToQemuParams for ObjectSevSnpGuest {
"kernel-hashes={}",
if self.kernel_hashes { "on" } else { "off" }
));
if let Some(host_data) = &self.host_data {
params.push(format!("host-data={}", host_data))
}
}
Ok(vec!["-object".to_owned(), params.join(",")])
}
@ -2430,7 +2434,7 @@ impl<'a> QemuCmdLine<'a> {
}
pub fn add_sev_protection_device(&mut self, cbitpos: u32, firmware: &str) {
let sev_object = ObjectSevSnpGuest::new(false, cbitpos);
let sev_object = ObjectSevSnpGuest::new(true, cbitpos, None);
self.devices.push(Box::new(sev_object));
self.devices.push(Box::new(Bios::new(firmware.to_owned())));
@ -2440,8 +2444,13 @@ impl<'a> QemuCmdLine<'a> {
.set_nvdimm(false);
}
pub fn add_sev_snp_protection_device(&mut self, cbitpos: u32, firmware: &str) {
let sev_snp_object = ObjectSevSnpGuest::new(true, cbitpos);
pub fn add_sev_snp_protection_device(
&mut self,
cbitpos: u32,
firmware: &str,
host_data: &Option<String>,
) {
let sev_snp_object = ObjectSevSnpGuest::new(true, cbitpos, host_data.clone());
self.devices.push(Box::new(sev_snp_object));
self.devices.push(Box::new(Bios::new(firmware.to_owned())));

1
src/runtime-rs/crates/hypervisor/src/qemu/inner.rs
View File

@ -136,6 +136,7 @@ impl QemuInner {
cmdline.add_sev_snp_protection_device(
sev_snp_cfg.cbitpos,
&sev_snp_cfg.firmware,
&sev_snp_cfg.host_data,
)
} else {
cmdline.add_sev_protection_device(