linux-kernel - Re: [PATCH 26/34] KVM: selftests: Add helpers to do KVM_HC_MAP_GPA

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Date:   Mon, 6 Nov 2023 11:44:16 +0000
From:   Fuad Tabba <tabba@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Huacai Chen <chenhuacai@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Anup Patel <anup@...infault.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Sean Christopherson <seanjc@...gle.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Xiaoyao Li <xiaoyao.li@...el.com>,
        Xu Yilun <yilun.xu@...el.com>,
        Chao Peng <chao.p.peng@...ux.intel.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Anish Moorthy <amoorthy@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>,
        Isaku Yamahata <isaku.yamahata@...el.com>,
        Mickaël Salaün <mic@...ikod.net>,
        Vlastimil Babka <vbabka@...e.cz>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Ackerley Tng <ackerleytng@...gle.com>,
        Maciej Szmigiero <mail@...iej.szmigiero.name>,
        David Hildenbrand <david@...hat.com>,
        Quentin Perret <qperret@...gle.com>,
        Michael Roth <michael.roth@....com>,
        Wang <wei.w.wang@...el.com>,
        Liam Merwick <liam.merwick@...cle.com>,
        Isaku Yamahata <isaku.yamahata@...il.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH 26/34] KVM: selftests: Add helpers to do
 KVM_HC_MAP_GPA_RANGE hypercalls (x86)

On Sun, Nov 5, 2023 at 4:34 PM Paolo Bonzini <pbonzini@...hat.com> wrote:
>
> From: Vishal Annapurve <vannapurve@...gle.com>
>
> Add helpers for x86 guests to invoke the KVM_HC_MAP_GPA_RANGE hypercall,
> which KVM will forward to userspace and thus can be used by tests to
> coordinate private<=>shared conversions between host userspace code and
> guest code.
>
> Signed-off-by: Vishal Annapurve <vannapurve@...gle.com>
> [sean: drop shared/private helpers (let tests specify flags)]
> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> Message-Id: <20231027182217.3615211-29-seanjc@...gle.com>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---

Reviewed-by: Fuad Tabba <tabba@...gle.com>
Tested-by: Fuad Tabba <tabba@...gle.com>

Cheers,
/fuad

>  .../selftests/kvm/include/x86_64/processor.h      | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h
> index 25bc61dac5fb..a84863503fcb 100644
> --- a/tools/testing/selftests/kvm/include/x86_64/processor.h
> +++ b/tools/testing/selftests/kvm/include/x86_64/processor.h
> @@ -15,6 +15,7 @@
>  #include <asm/msr-index.h>
>  #include <asm/prctl.h>
>
> +#include <linux/kvm_para.h>
>  #include <linux/stringify.h>
>
>  #include "../kvm_util.h"
> @@ -1194,6 +1195,20 @@ uint64_t kvm_hypercall(uint64_t nr, uint64_t a0, uint64_t a1, uint64_t a2,
>  uint64_t __xen_hypercall(uint64_t nr, uint64_t a0, void *a1);
>  void xen_hypercall(uint64_t nr, uint64_t a0, void *a1);
>
> +static inline uint64_t __kvm_hypercall_map_gpa_range(uint64_t gpa,
> +                                                    uint64_t size, uint64_t flags)
> +{
> +       return kvm_hypercall(KVM_HC_MAP_GPA_RANGE, gpa, size >> PAGE_SHIFT, flags, 0);
> +}
> +
> +static inline void kvm_hypercall_map_gpa_range(uint64_t gpa, uint64_t size,
> +                                              uint64_t flags)
> +{
> +       uint64_t ret = __kvm_hypercall_map_gpa_range(gpa, size, flags);
> +
> +       GUEST_ASSERT(!ret);
> +}
> +
>  void __vm_xsave_require_permission(uint64_t xfeature, const char *name);
>
>  #define vm_xsave_require_permission(xfeature)  \
> --
> 2.39.1
>
>