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| author |   Maya Nakamura <m.maya.nakamura@gmail.com> | 2019-07-12 08:21:25 +0000 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@linutronix.de> | 2019-07-22 11:06:45 +0200 |
| commit | 8c3e44bde7fd1b8291515f046008225711ac7beb (patch) | |
| tree | 4eadf13c6c30fbdc96a6358c6103fa4d88b121a2 /arch/x86/hyperv | |
| parent | x86/hyperv: Create and use Hyper-V page definitions (diff) | |
| download | linux-dev-8c3e44bde7fd1b8291515f046008225711ac7beb.tar.xz linux-dev-8c3e44bde7fd1b8291515f046008225711ac7beb.zip | |
x86/hyperv: Add functions to allocate/deallocate page for Hyper-V
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.
Signed-off-by: Maya Nakamura <m.maya.nakamura@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Link: https://lore.kernel.org/lkml/alpine.DEB.2.21.1906272334560.32342@nanos.tec.linutronix.de/
Link: https://lore.kernel.org/lkml/87muindr9c.fsf@vitty.brq.redhat.com/
Link: https://lkml.kernel.org/r/706b2e71eb3e587b5f8801e50f090fae2a00e35d.1562916939.git.m.maya.nakamura@gmail.com
Diffstat (limited to 'arch/x86/hyperv')
| -rw-r--r-- | arch/x86/hyperv/hv_init.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index 0d258688c8cf..d314cf1e15fd 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; |