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    Subject[PATCH 03/12] x86/xen: Introduce new function to map HYPERVISOR_shared_info on Resume
    Introduce a small function which re-uses shared page's PA allocated
    during guest initialization time in reserve_shared_info() and not
    allocate new page during resume flow.
    It also does the mapping of shared_info_page by calling
    xen_hvm_init_shared_info() to use the function.

    Signed-off-by: Anchal Agarwal <anchalag@amazon.com>
    ---
    arch/x86/xen/enlighten_hvm.c | 7 +++++++
    arch/x86/xen/xen-ops.h | 1 +
    2 files changed, 8 insertions(+)

    diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c
    index e138f7de52d2..75b1ec7a0fcd 100644
    --- a/arch/x86/xen/enlighten_hvm.c
    +++ b/arch/x86/xen/enlighten_hvm.c
    @@ -27,6 +27,13 @@

    static unsigned long shared_info_pfn;

    +void xen_hvm_map_shared_info(void)
    +{
    + xen_hvm_init_shared_info();
    + if (shared_info_pfn)
    + HYPERVISOR_shared_info = __va(PFN_PHYS(shared_info_pfn));
    +}
    +
    void xen_hvm_init_shared_info(void)
    {
    struct xen_add_to_physmap xatp;
    diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
    index 45a441c33d6d..d84c357994bd 100644
    --- a/arch/x86/xen/xen-ops.h
    +++ b/arch/x86/xen/xen-ops.h
    @@ -56,6 +56,7 @@ void xen_enable_syscall(void);
    void xen_vcpu_restore(void);

    void xen_callback_vector(void);
    +void xen_hvm_map_shared_info(void);
    void xen_hvm_init_shared_info(void);
    void xen_unplug_emulated_devices(void);

    --
    2.24.1.AMZN
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