This patch address bug report in https://bugs.launchpad.net/qemu/+bug/530077. Failed vmentries were handled with handle_unhandled() which prints a rather unfriendly message to the user. This patch separates handling vmentry failures from unknown exit reasons and prints a friendly message to the user. Signed-off-by: Mohammed Gamal <m.gamal005@xxxxxxxxx> --- qemu-kvm.c | 27 ++++++++++++++++++++++++++- 1 files changed, 26 insertions(+), 1 deletions(-) diff --git a/qemu-kvm.c b/qemu-kvm.c index 9534b31..b8a9278 100644 --- a/qemu-kvm.c +++ b/qemu-kvm.c @@ -106,6 +106,31 @@ static int handle_unhandled(uint64_t reason) return -EINVAL; } +#define VMX_INVALID_GUEST_STATE 0x80000021 + +static int handle_failed_vmentry(uint64_t reason) +{ + fprintf(stderr, "kvm: vm entry failed with error 0x%" PRIx64 "\n\n", reason); + + /* Perhaps we will need to check if this machine is intel since exit reason 0x21 + has a different interpretation on SVM */ + if (reason == VMX_INVALID_GUEST_STATE) { + fprintf(stderr, "If you're runnning a guest on an Intel machine without\n"); + fprintf(stderr, "unrestricted mode support, the failure can be most likely\n"); + fprintf(stderr, "due to the guest entering an invalid state for Intel VT.\n"); + fprintf(stderr, "For example, the guest maybe running in big real mode\n"); + fprintf(stderr, "which is not supported on less recent Intel processors.\n\n"); + fprintf(stderr, "You may want to try enabling KVM real mode emulation. To\n"); + fprintf(stderr, "enable it, you can run the following commands as root:\n"); + fprintf(stderr, "# rmmod kvm_intel\n"); + fprintf(stderr, "# rmmod kvm\n"); + fprintf(stderr, "# modprobe kvm_intel emulate_invalid_guest_state=1\n\n"); + fprintf(stderr, "WARNING: Real mode emulation is still work-in-progress\n"); + fprintf(stderr, "and thus it is not always guaranteed to work.\n\n"); + } + + return -EINVAL; +} static inline void set_gsi(kvm_context_t kvm, unsigned int gsi) { @@ -586,7 +611,7 @@ int kvm_run(CPUState *env) r = handle_unhandled(run->hw.hardware_exit_reason); break; case KVM_EXIT_FAIL_ENTRY: - r = handle_unhandled(run->fail_entry.hardware_entry_failure_reason); + r = handle_failed_vmentry(run->fail_entry.hardware_entry_failure_reason); break; case KVM_EXIT_EXCEPTION: fprintf(stderr, "exception %d (%x)\n", run->ex.exception, -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
