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hypervisor: mshv: implement extended guest requests with empty certs

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Previously we didn't handle extended guest requests at all and always
returned an error. This lead to issues with some guests that expected
extended requests to succeed. Instead, handle extended requests like
normal requests and write zeros to the extended area to signal to the
guest that we don't want to supply any additional certificate data.

Signed-off-by: Tom Dohrmann <erbse.13@gmx.de>
This commit is contained in:
Tom Dohrmann
2024-08-26 11:14:34 +02:00
committed by Wei Liu
parent 486c61da5e
commit 8fd0310db9
2 changed files with 21 additions and 13 deletions
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hypervisor/src/mshv/snp_constants.rs
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@@ -20,5 +20,6 @@ pub const ECDSA_SIG_Y_COMPONENT_END: usize =
// These constants are derived from GHCB spec Sect. 2.6 Table 3 GHCB Layout
// Link: https://www.amd.com/content/dam/amd/en/documents/epyc-technical-docs/specifications/56421.pdf
pub const GHCB_RAX_OFFSET: u64 = 0x01F8;
pub const GHCB_RBX_OFFSET: u64 = 0x0318;
pub const GHCB_SW_EXITINFO1_OFFSET: u64 = 0x398;
pub const GHCB_SW_EXITINFO2_OFFSET: u64 = 0x3A0;