With SVM_SEV_FEAT_DEBUG_SWAP enabled, the VM should not get #VC events for DR7 read/write which it rather avoided. Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxx> --- arch/x86/kernel/sev.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index a428c62330d3..4e91b9f8742c 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -1618,6 +1618,9 @@ static enum es_result vc_handle_dr7_write(struct ghcb *ghcb, long val, *reg = vc_insn_get_rm(ctxt); enum es_result ret; + if ((sev_status >> 2) & SVM_SEV_FEAT_DEBUG_SWAP) + return ES_VMM_ERROR; + if (!reg) return ES_DECODE_FAILED; @@ -1655,6 +1658,9 @@ static enum es_result vc_handle_dr7_read(struct ghcb *ghcb, struct sev_es_runtime_data *data = this_cpu_read(runtime_data); long *reg = vc_insn_get_rm(ctxt); + if ((sev_status >> 2) & SVM_SEV_FEAT_DEBUG_SWAP) + return ES_VMM_ERROR; + if (!reg) return ES_DECODE_FAILED; -- 2.38.1
