Re: [PATCH] target/i386/sev: Fix a segfault in sev_kvm_init

[Zhao Liu]

On Thu, Jan 04, 2024 at 04:18:20PM +0530, Srikanth Aithal wrote:
> Date: Thu, 4 Jan 2024 16:18:20 +0530
> From: Srikanth Aithal <srikanth.aithal@amd.com>
> Subject: [PATCH] target/i386/sev: Fix a segfault in sev_kvm_init
> X-Mailer: git-send-email 2.34.1
> 
> Propogate error code using errp in sev_kvm_init.
> 
> Before fix:
> qemu-system-x86_64: sev_kvm_init: guest policy requires SEV-ES,
> but host SEV-ES support unavailable
> 27747 Segmentation fault      (core dumped)
> 
> After fix:
> qemu-system-x86_64: sev_kvm_init: guest policy requires SEV-ES,
> but host SEV-ES support unavailable
> qemu-system-x86_64: failed to initialize kvm: Operation not permitted
> 
> While at it, also fix two more locations.
> 
> Reviewed-by: Nikunj A Dadhania <nikunj@amd.com>
> Signed-off-by: Srikanth Aithal <srikanth.aithal@amd.com>
> ---
>  target/i386/sev.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>

> 
> diff --git a/target/i386/sev.c b/target/i386/sev.c
> index 9a71246682..c0a4d5e535 100644
> --- a/target/i386/sev.c
> +++ b/target/i386/sev.c
> @@ -922,7 +922,8 @@ int sev_kvm_init(ConfidentialGuestSupport *cgs, Error 
> **errp)
>  
>      ret = ram_block_discard_disable(true);
>      if (ret) {
> -        error_report("%s: cannot disable RAM discard", __func__);
> +        error_setg(errp, "%s: cannot disable "
> +                     "RAM discard", __func__);
>          return -1;
>      }
>  
> @@ -979,13 +980,13 @@ int sev_kvm_init(ConfidentialGuestSupport *cgs, Error 
> **errp)
>  
>      if (sev_es_enabled()) {
>          if (!kvm_kernel_irqchip_allowed()) {
> -            error_report("%s: SEV-ES guests require in-kernel irqchip 
> support",
> -                         __func__);
> +            error_setg(errp, "%s: SEV-ES guests require in-kernel "
> +                         "irqchip support", __func__);
>              goto err;
>          }
>  
>          if (!(status.flags & SEV_STATUS_FLAGS_CONFIG_ES)) {
> -            error_report("%s: guest policy requires SEV-ES, but "
> +            error_setg(errp, "%s: guest policy requires SEV-ES, but "
>                           "host SEV-ES support unavailable",
>                           __func__);
>              goto err;
> -- 
> 2.34.1
> 
>