Add support for forwarding hypercalls to vmm from
VC handler.
Signed-off-by: Vishal Annapurve <vannapurve@xxxxxxxxxx>
---
.../selftests/kvm/lib/x86_64/sev_exitlib.c | 39 ++++++++++++++++---
1 file changed, 34 insertions(+), 5 deletions(-)
diff --git a/tools/testing/selftests/kvm/lib/x86_64/sev_exitlib.c b/tools/testing/selftests/kvm/lib/x86_64/sev_exitlib.c
index b3f7b0297e5b..749b9264f90d 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/sev_exitlib.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/sev_exitlib.c
@@ -199,6 +199,31 @@ static int handle_vc_cpuid(struct ghcb *ghcb, u64 ghcb_gpa, struct ex_regs *regs
return 0;
}
+static int handle_vc_vmmcall(struct ghcb *ghcb, u64 ghcb_gpa, struct ex_regs *regs)
+{
+ int ret;
+
+ ghcb_set_rax(ghcb, regs->rax);
+ ghcb_set_rbx(ghcb, regs->rbx);
+ ghcb_set_rcx(ghcb, regs->rcx);
+ ghcb_set_rdx(ghcb, regs->rdx);
+ ghcb_set_rsi(ghcb, regs->rsi);
+ ghcb_set_cpl(ghcb, 0);
+
+ ret = sev_es_ghcb_hv_call(ghcb, ghcb_gpa, SVM_EXIT_VMMCALL);
+ if (ret)
+ return ret;
+
+ if (!ghcb_rax_is_valid(ghcb))
+ return 1;
+
+ regs->rax = ghcb->save.rax;
+
+ regs->rip += 3;
+
+ return 0;
+}
+
static int handle_msr_vc_cpuid(struct ex_regs *regs)
{
uint32_t fn = regs->rax & 0xFFFFFFFF;
@@ -239,11 +264,15 @@ static int handle_msr_vc_cpuid(struct ex_regs *regs)
int sev_es_handle_vc(void *ghcb, u64 ghcb_gpa, struct ex_regs *regs)
{
- if (regs->error_code != SVM_EXIT_CPUID)
- return 1;
+ if (regs->error_code == SVM_EXIT_CPUID) {
+ if (!ghcb)
+ return handle_msr_vc_cpuid(regs);
+
+ return handle_vc_cpuid(ghcb, ghcb_gpa, regs);
+ }
- if (!ghcb)
- return handle_msr_vc_cpuid(regs);
+ if (regs->error_code == SVM_EXIT_VMMCALL)
+ return handle_vc_vmmcall(ghcb, ghcb_gpa, regs);
- return handle_vc_cpuid(ghcb, ghcb_gpa, regs);
+ return 1;
}
--
2.36.1.124.g0e6072fb45-goog
