linux-kernel - Re: [PATCH 3/3] selftests: sev_migrate

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Date:   Thu, 9 Dec 2021 12:27:34 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Peter Gonda <pgonda@...gle.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Marc Orr <marcorr@...gle.com>
Subject: Re: [PATCH 3/3] selftests: sev_migrate_tests: Add mirror command
 tests

On 12/8/21 20:16, Peter Gonda wrote:
> Add tests to confirm mirror vms can only run correct subset of commands.
> 
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Sean Christopherson <seanjc@...gle.com>
> Cc: Marc Orr <marcorr@...gle.com>
> Signed-off-by: Peter Gonda <pgonda@...gle.com>
> ---
>   .../selftests/kvm/x86_64/sev_migrate_tests.c  | 55 +++++++++++++++++--
>   1 file changed, 51 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/x86_64/sev_migrate_tests.c b/tools/testing/selftests/kvm/x86_64/sev_migrate_tests.c
> index 4bb960ca6486..80056bbbb003 100644
> --- a/tools/testing/selftests/kvm/x86_64/sev_migrate_tests.c
> +++ b/tools/testing/selftests/kvm/x86_64/sev_migrate_tests.c
> @@ -21,7 +21,7 @@
>   #define NR_LOCK_TESTING_THREADS 3
>   #define NR_LOCK_TESTING_ITERATIONS 10000
>   
> -static void sev_ioctl(int vm_fd, int cmd_id, void *data)
> +static int __sev_ioctl(int vm_fd, int cmd_id, void *data, __u32 *fw_error)
>   {
>   	struct kvm_sev_cmd cmd = {
>   		.id = cmd_id,
> @@ -30,11 +30,20 @@ static void sev_ioctl(int vm_fd, int cmd_id, void *data)
>   	};
>   	int ret;
>   
> -
>   	ret = ioctl(vm_fd, KVM_MEMORY_ENCRYPT_OP, &cmd);
> -	TEST_ASSERT(ret == 0 && cmd.error == SEV_RET_SUCCESS,
> +	*fw_error = cmd.error;
> +	return ret;
> +}
> +
> +static void sev_ioctl(int vm_fd, int cmd_id, void *data)
> +{
> +	int ret;
> +	__u32 fw_error;
> +
> +	ret = __sev_ioctl(vm_fd, cmd_id, data, &fw_error);
> +	TEST_ASSERT(ret == 0 && fw_error == SEV_RET_SUCCESS,
>   		    "%d failed: return code: %d, errno: %d, fw error: %d",
> -		    cmd_id, ret, errno, cmd.error);
> +		    cmd_id, ret, errno, fw_error);
>   }
>   
>   static struct kvm_vm *sev_vm_create(bool es)
> @@ -226,6 +235,42 @@ static void sev_mirror_create(int dst_fd, int src_fd)
>   	TEST_ASSERT(!ret, "Copying context failed, ret: %d, errno: %d\n", ret, errno);
>   }
>   
> +static void verify_mirror_allowed_cmds(int vm_fd)
> +{
> +	struct kvm_sev_guest_status status;
> +
> +	for (int cmd_id = KVM_SEV_INIT; cmd_id < KVM_SEV_NR_MAX; ++cmd_id) {
> +		int ret;
> +		__u32 fw_error;
> +
> +		/*
> +		 * These commands are allowed for mirror VMs, all others are
> +		 * not.
> +		 */
> +		switch (cmd_id) {
> +		case KVM_SEV_LAUNCH_UPDATE_VMSA:
> +		case KVM_SEV_GUEST_STATUS:
> +		case KVM_SEV_DBG_DECRYPT:
> +		case KVM_SEV_DBG_ENCRYPT:
> +			continue;
> +		default:
> +			break;
> +		}
> +
> +		/*
> +		 * These commands should be disallowed before the data
> +		 * parameter is examined so NULL is OK here.
> +		 */
> +		ret = __sev_ioctl(vm_fd, cmd_id, NULL, &fw_error);
> +		TEST_ASSERT(
> +			ret == -1 && errno == EINVAL,
> +			"Should not be able call command: %d. ret: %d, errno: %d\n",
> +			cmd_id, ret, errno);
> +	}
> +
> +	sev_ioctl(vm_fd, KVM_SEV_GUEST_STATUS, &status);
> +}
> +
>   static void test_sev_mirror(bool es)
>   {
>   	struct kvm_vm *src_vm, *dst_vm;
> @@ -243,6 +288,8 @@ static void test_sev_mirror(bool es)
>   	if (es)
>   		sev_ioctl(dst_vm->fd, KVM_SEV_LAUNCH_UPDATE_VMSA, NULL);
>   
> +	verify_mirror_allowed_cmds(dst_vm->fd);
> +
>   	kvm_vm_free(src_vm);
>   	kvm_vm_free(dst_vm);
>   }
> 

Queued, thanks.

Paolo