From: Maya Nakamura <m.maya.nakamura@gmail.com>
To: mikelley@microsoft.com, kys@microsoft.com,
haiyangz@microsoft.com, sthemmin@microsoft.com,
sashal@kernel.org
Cc: x86@kernel.org, linux-hyperv@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 2/5] x86: hv: hv_init.c: Add functions to allocate/deallocate page for Hyper-V
Date: Thu, 6 Jun 2019 08:05:20 +0000 [thread overview]
Message-ID: <5cf4ad6f3fae8dec33e364b367b99cbb5b0f2ba4.1559807514.git.m.maya.nakamura@gmail.com> (raw)
In-Reply-To: <cover.1559807514.git.m.maya.nakamura@gmail.com>
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>
---
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 e4ba467a9fc6..84baf0e9a2d4 100644
--- a/arch/x86/hyperv/hv_init.c
+++ b/arch/x86/hyperv/hv_init.c
@@ -98,6 +98,20 @@ 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
next prev parent reply other threads:[~2019-06-06 8:05 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-06 8:00 [PATCH v2 0/5] hv: Remove dependencies on guest page size Maya Nakamura
2019-06-06 8:03 ` [PATCH v2 1/5] x86: hv: hyperv-tlfs.h: Create and use Hyper-V page definitions Maya Nakamura
2019-06-12 10:36 ` Vitaly Kuznetsov
2019-06-06 8:05 ` Maya Nakamura [this message]
2019-06-12 10:36 ` [PATCH v2 2/5] x86: hv: hv_init.c: Add functions to allocate/deallocate page for Hyper-V Vitaly Kuznetsov
2019-06-17 3:59 ` Maya Nakamura
2019-06-06 8:06 ` [PATCH v2 3/5] hv: vmbus: Replace page definition with Hyper-V specific one Maya Nakamura
2019-06-12 10:38 ` Vitaly Kuznetsov
2019-06-06 8:07 ` [PATCH v2 4/5] HID: hv: Remove dependencies on PAGE_SIZE for ring buffer Maya Nakamura
2019-06-12 10:40 ` Vitaly Kuznetsov
[not found] ` <BL0PR2101MB134877ED5DCB9F23033C92D9D7EF0@BL0PR2101MB1348.namprd21.prod.outlook.com>
2019-06-14 7:53 ` Vitaly Kuznetsov
2019-06-06 8:09 ` [PATCH v2 5/5] Input: " Maya Nakamura
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