Introduce two new functions, hv_alloc_hyperv_page() and hv_free_hyperv_page(), to allocate/deallocate memory with the size and alignment that Hyper-V expects as a page. Although currently they are not used, they are ready to be used to allocate/deallocate memory on x86 when their ARM64 counterparts are implemented, keeping symmetry between architectures with potentially different guest page sizes.
Link: https://lore.kernel.org/lkml/87muindr9c....@vitty.brq.redhat.com/ Signed-off-by: Maya Nakamura <m.maya.nakam...@gmail.com> Reviewed-by: Michael Kelley <mikel...@microsoft.com> Reviewed-by: Vitaly Kuznetsov <vkuzn...@redhat.com> --- arch/x86/hyperv/hv_init.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 0e033ef11a9f..e8960a83add7 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -37,6 +37,20 @@ EXPORT_SYMBOL_GPL(hyperv_pcpu_input_arg); u32 hv_max_vp_index; EXPORT_SYMBOL_GPL(hv_max_vp_index); +void *hv_alloc_hyperv_page(void) +{ + BUILD_BUG_ON(PAGE_SIZE != HV_HYP_PAGE_SIZE); + + return (void *)__get_free_page(GFP_KERNEL); +} +EXPORT_SYMBOL_GPL(hv_alloc_hyperv_page); + +void hv_free_hyperv_page(unsigned long addr) +{ + free_page(addr); +} +EXPORT_SYMBOL_GPL(hv_free_hyperv_page); + static int hv_cpu_init(unsigned int cpu) { u64 msr_vp_index; -- 2.17.1
