linux-kernel - Re: [Patch v3 13/13] KVM: selftests: Test Hyper-V extended hypercall exit to userspace

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Date:   Fri, 9 Dec 2022 14:05:36 -0800
From:   David Matlack <dmatlack@...gle.com>
To:     Vipin Sharma <vipinsh@...gle.com>
Cc:     seanjc@...gle.com, pbonzini@...hat.com, vkuznets@...hat.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Patch v3 13/13] KVM: selftests: Test Hyper-V extended hypercall
 exit to userspace

On Mon, Dec 05, 2022 at 11:14:30AM -0800, Vipin Sharma wrote:
> Hyper-V extended hypercalls by default exit to userspace. Verify
> userspace gets the call, update the result and then verify in guest
> correct result is received.
> 
> Signed-off-by: Vipin Sharma <vipinsh@...gle.com>

Signed-off-by: David Matlack <dmatlack@...gle.com>

> ---
[...]
> +++ b/tools/testing/selftests/kvm/x86_64/hyperv_extended_hypercalls.c
> @@ -0,0 +1,93 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Test Hyper-V extended hypercall, HV_EXT_CALL_QUERY_CAPABILITIES (0x8001),
> + * exit to userspace and receive result in guest.
> + *
> + * Negative tests are present in hyperv_features.c
> + *
> + * Copyright 2022 Google LLC
> + * Author: Vipin Sharma <vipinsh@...gle.com>
> + */
> +
> +#include "kvm_util.h"
> +#include "processor.h"
> +#include "hyperv.h"
> +
> +/* Any value is fine */
> +#define EXT_CAPABILITIES 0xbull
> +
> +static void guest_code(vm_vaddr_t in_pg_gpa, vm_vaddr_t out_pg_gpa,
> +		       vm_vaddr_t out_pg_gva)

nit: Use vm_paddr_t for guest physical addresses.