On 12/6/2024 5:31 PM, Xu Yilun wrote:
+static int tdx_report_fatal_error(struct kvm_vcpu *vcpu)
+{
+ u64 reg_mask = kvm_rcx_read(vcpu);
+ u64* opt_regs;
+
+ /*
+ * Skip sanity checks and let userspace decide what to do if sanity
+ * checks fail.
+ */
+ vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
+ vcpu->run->system_event.type = KVM_SYSTEM_EVENT_TDX_FATAL;
+ vcpu->run->system_event.ndata = 10;
+ /* Error codes. */
+ vcpu->run->system_event.data[0] = tdvmcall_a0_read(vcpu);
+ /* GPA of additional information page. */
+ vcpu->run->system_event.data[1] = tdvmcall_a1_read(vcpu);
+ /* Information passed via registers (up to 64 bytes). */
+ opt_regs = &vcpu->run->system_event.data[2];
+
+#define COPY_REG(REG, MASK) \
+ do { \
+ if (reg_mask & MASK) \
+ *opt_regs = kvm_ ## REG ## _read(vcpu); \
+ else \
+ *opt_regs = 0; \
+ opt_regs++; \
+ } while (0)
+
+ /* The order is defined in GHCI. */
+ COPY_REG(r14, BIT_ULL(14));
+ COPY_REG(r15, BIT_ULL(15));
+ COPY_REG(rbx, BIT_ULL(3));
+ COPY_REG(rdi, BIT_ULL(7));
+ COPY_REG(rsi, BIT_ULL(6));
+ COPY_REG(r8, BIT_ULL(8));
+ COPY_REG(r9, BIT_ULL(9));
+ COPY_REG(rdx, BIT_ULL(2));
Nit:
#undef COPY_REG
Thanks for catching it!
Thanks,
Yilun
+
+ /*
+ * Set the status code according to GHCI spec, although the vCPU may
+ * not return back to guest.
+ */
+ tdvmcall_set_return_code(vcpu, TDVMCALL_STATUS_SUCCESS);
+
+ /* Forward request to userspace. */
+ return 0;
+}
