diff options
Diffstat (limited to 'arch/x86/kernel/sev.c')
| -rw-r--r-- | arch/x86/kernel/sev.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index 2586ba662572..84f373155635 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -1340,6 +1340,17 @@ static enum es_result vc_handle_msr(struct ghcb *ghcb, struct es_em_ctxt *ctxt) /* Is it a WRMSR? */ exit_info_1 = (ctxt->insn.opcode.bytes[1] == 0x30) ? 1 : 0; + if (regs->cx == MSR_SVSM_CAA) { + /* Writes to the SVSM CAA msr are ignored */ + if (exit_info_1) + return ES_OK; + + regs->ax = lower_32_bits(this_cpu_read(svsm_caa_pa)); + regs->dx = upper_32_bits(this_cpu_read(svsm_caa_pa)); + + return ES_OK; + } + ghcb_set_rcx(ghcb, regs->cx); if (exit_info_1) { ghcb_set_rax(ghcb, regs->ax); |