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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 v3 2/5] x86: hv: hv_init.c: Add functions to allocate/deallocate page for Hyper-V
Date: Tue, 18 Jun 2019 06:13:08 +0000	[thread overview]
Message-ID: <d19c28cda88bf1706baff883380dfd321da30a68.1560837096.git.m.maya.nakamura@gmail.com> (raw)
In-Reply-To: <cover.1560837096.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.

Link: https://lore.kernel.org/lkml/87muindr9c.fsf@vitty.brq.redhat.com/
Signed-off-by: Maya Nakamura <m.maya.nakamura@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@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


  parent reply	other threads:[~2019-06-18  6:45 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-18  6:09 [PATCH v3 0/5] hv: Remove dependencies on guest page size Maya Nakamura
2019-06-18  6:11 ` [PATCH v3 1/5] x86: hv: hyperv-tlfs.h: Create and use Hyper-V page definitions Maya Nakamura
2019-06-18  6:13 ` Maya Nakamura [this message]
2019-06-27 21:38   ` [PATCH v3 2/5] x86: hv: hv_init.c: Add functions to allocate/deallocate page for Hyper-V Thomas Gleixner
2019-06-29  6:50     ` Maya Nakamura
2019-06-18  6:14 ` [PATCH v3 3/5] hv: vmbus: Replace page definition with Hyper-V specific one Maya Nakamura
2019-06-18  6:15 ` [PATCH v3 4/5] HID: hv: Remove dependencies on PAGE_SIZE for ring buffer Maya Nakamura
2019-06-18  6:17 ` [PATCH v3 5/5] Input: " Maya Nakamura

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