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hypervisor: Fix boot failure on SNP guest

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Current version can't boot a SNP guest while using
more than one VCPU. It turns out that there is an
issue in the Snp AP creation process. We should be writing
to Software exitinfo1 instead of exitinfo2. This patch fixes
the issue and we can boot multi vcpu SNP guest.

Signed-off-by: Muminul Islam <muislam@microsoft.com>
This commit is contained in:
Muminul Islam 2024-03-12 14:16:58 -07:00 committed by Rob Bradford
parent 61d9debb5e
commit 2d6287d159
1 changed files with 4 additions and 3 deletions
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7
hypervisor/src/mshv/mod.rs
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@ -1104,13 +1104,14 @@ impl cpu::Vcpu for MshvVcpu {
.sev_snp_ap_create(&mshv_ap_create_req)
.map_err(|e| cpu::HypervisorCpuError::RunVcpu(e.into()))?;
let mut swei2_rw_gpa_arg = mshv_bindings::mshv_read_write_gpa {
base_gpa: ghcb_gpa + GHCB_SW_EXITINFO2_OFFSET,
let mut swei1_rw_gpa_arg = mshv_bindings::mshv_read_write_gpa {
base_gpa: ghcb_gpa + GHCB_SW_EXITINFO1_OFFSET,
byte_count: std::mem::size_of::<u64>() as u32,
..Default::default()
};
self.fd
.gpa_write(&mut swei2_rw_gpa_arg)
.gpa_write(&mut swei1_rw_gpa_arg)
.map_err(|e| cpu::HypervisorCpuError::GpaWrite(e.into()))?;
}
_ => panic!(