From: Michael Kelley <mikelley@microsoft.com>
To: will@kernel.org, ardb@kernel.org, arnd@arndb.de,
catalin.marinas@arm.com, mark.rutland@arm.com, maz@kernel.org,
linux-arm-kernel@lists.infradead.org, gregkh@linuxfoundation.org,
linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org,
linux-efi@vger.kernel.org, linux-arch@vger.kernel.org,
olaf@aepfle.de, apw@canonical.com, vkuznets@redhat.com,
jasowang@redhat.com, marcelo.cerri@canonical.com,
kys@microsoft.com
Cc: mikelley@microsoft.com, sunilmut@microsoft.com, boqun.feng@gmail.com
Subject: [PATCH v6 04/10] arm64: hyperv: Add memory alloc/free functions for Hyper-V size pages
Date: Sat, 14 Mar 2020 08:35:13 -0700 [thread overview]
Message-ID: <1584200119-18594-5-git-send-email-mikelley@microsoft.com> (raw)
In-Reply-To: <1584200119-18594-1-git-send-email-mikelley@microsoft.com>
Add ARM64-specific code to allocate memory with HV_HYP_PAGE_SIZE
size and alignment. These are for use when pages need to be shared
with Hyper-V. Separate functions are needed as the page size used
by Hyper-V may not be the same as the guest page size.
This code is built only when CONFIG_HYPERV is enabled.
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
---
arch/arm64/hyperv/hv_core.c | 34 ++++++++++++++++++++++++++++++++++
include/asm-generic/mshyperv.h | 5 +++++
2 files changed, 39 insertions(+)
diff --git a/arch/arm64/hyperv/hv_core.c b/arch/arm64/hyperv/hv_core.c
index 272c348..4aa6b8f 100644
--- a/arch/arm64/hyperv/hv_core.c
+++ b/arch/arm64/hyperv/hv_core.c
@@ -17,12 +17,46 @@
#include <linux/slab.h>
#include <linux/hyperv.h>
#include <linux/arm-smccc.h>
+#include <linux/string.h>
#include <asm-generic/bug.h>
#include <asm/hyperv-tlfs.h>
#include <asm/mshyperv.h>
/*
+ * Functions for allocating and freeing memory with size and
+ * alignment HV_HYP_PAGE_SIZE. These functions are needed because
+ * the guest page size may not be the same as the Hyper-V page
+ * size. We depend upon kmalloc() aligning power-of-two size
+ * allocations to the allocation size boundary, so that the
+ * allocated memory appears to Hyper-V as a page of the size
+ * it expects.
+ *
+ * These functions are used by arm64 specific code as well as
+ * arch independent Hyper-V drivers.
+ */
+
+void *hv_alloc_hyperv_page(void)
+{
+ BUILD_BUG_ON(PAGE_SIZE < HV_HYP_PAGE_SIZE);
+ return kmalloc(HV_HYP_PAGE_SIZE, GFP_KERNEL);
+}
+EXPORT_SYMBOL_GPL(hv_alloc_hyperv_page);
+
+void *hv_alloc_hyperv_zeroed_page(void)
+{
+ return kzalloc(HV_HYP_PAGE_SIZE, GFP_KERNEL);
+}
+EXPORT_SYMBOL_GPL(hv_alloc_hyperv_zeroed_page);
+
+void hv_free_hyperv_page(unsigned long addr)
+{
+ kfree((void *)addr);
+}
+EXPORT_SYMBOL_GPL(hv_free_hyperv_page);
+
+
+/*
* hv_do_hypercall- Invoke the specified hypercall
*/
u64 hv_do_hypercall(u64 control, void *input, void *output)
diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h
index b3f1082..1a7c4c5 100644
--- a/include/asm-generic/mshyperv.h
+++ b/include/asm-generic/mshyperv.h
@@ -99,6 +99,11 @@ static inline void vmbus_signal_eom(struct hv_message *msg, u32 old_msg_type)
void hv_setup_crash_handler(void (*handler)(struct pt_regs *regs));
void hv_remove_crash_handler(void);
+void *hv_alloc_hyperv_page(void);
+void *hv_alloc_hyperv_zeroed_page(void);
+void hv_free_hyperv_page(unsigned long addr);
+
+
#if IS_ENABLED(CONFIG_HYPERV)
/*
* Hypervisor's notion of virtual processor ID is different from
--
1.8.3.1
next prev parent reply other threads:[~2020-03-15 1:32 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-14 15:35 [PATCH v6 00/10] Subject: Enable Linux guests on Hyper-V on ARM64 Michael Kelley
2020-03-14 15:35 ` [PATCH v6 01/10] arm64: hyperv: Add core Hyper-V include files Michael Kelley
2020-03-15 17:31 ` Marc Zyngier
2020-03-18 0:10 ` Michael Kelley
2020-03-16 8:47 ` Arnd Bergmann
2020-03-18 0:12 ` Michael Kelley
2020-03-18 10:10 ` Arnd Bergmann
2020-03-19 21:31 ` Michael Kelley
2020-03-20 16:38 ` Arnd Bergmann
2020-03-14 15:35 ` [PATCH v6 02/10] arm/arm64: smccc-1.1: Add vendor specific owner definition Michael Kelley
2020-03-14 15:35 ` [PATCH v6 03/10] arm64: hyperv: Add hypercall and register access functions Michael Kelley
2020-03-14 15:35 ` Michael Kelley [this message]
2020-03-16 8:22 ` [PATCH v6 04/10] arm64: hyperv: Add memory alloc/free functions for Hyper-V size pages Arnd Bergmann
2020-03-16 8:30 ` gregkh
2020-03-16 8:30 ` Marc Zyngier
2020-03-16 8:32 ` Arnd Bergmann
2020-03-18 0:15 ` Michael Kelley
2020-03-18 9:57 ` Arnd Bergmann
2020-03-19 21:43 ` Michael Kelley
2020-03-20 16:28 ` Arnd Bergmann
2020-03-20 17:22 ` Michael Kelley
2020-03-14 15:35 ` [PATCH v6 05/10] arm64: hyperv: Add interrupt handlers for VMbus and stimer Michael Kelley
2020-03-16 8:25 ` Arnd Bergmann
2020-03-18 0:16 ` Michael Kelley
2020-03-18 9:52 ` Arnd Bergmann
2020-03-14 15:35 ` [PATCH v6 06/10] arm64: hyperv: Add kexec and panic handlers Michael Kelley
2020-03-15 18:15 ` Marc Zyngier
2020-03-18 0:17 ` Michael Kelley
2020-03-14 15:35 ` [PATCH v6 07/10] arm64: hyperv: Initialize hypervisor on boot Michael Kelley
2020-03-16 8:29 ` Arnd Bergmann
2020-03-18 0:17 ` Michael Kelley
2020-03-18 9:44 ` Arnd Bergmann
2020-03-14 15:35 ` [PATCH v6 08/10] Drivers: hv: vmbus: Add hooks for per-CPU IRQ Michael Kelley
2020-03-14 15:35 ` [PATCH v6 09/10] arm64: efi: Export screen_info Michael Kelley
2020-03-16 8:20 ` Arnd Bergmann
2020-03-18 0:18 ` Michael Kelley
2020-03-18 9:26 ` Arnd Bergmann
2020-03-19 21:46 ` Michael Kelley
2020-05-13 14:26 ` Nikhil Mahale
2020-05-18 4:25 ` Nikhil Mahale
2020-05-18 12:51 ` Ard Biesheuvel
2020-05-22 11:14 ` Nikhil Mahale
2020-05-22 11:32 ` Ard Biesheuvel
2020-03-14 15:35 ` [PATCH v6 10/10] Drivers: hv: Enable Hyper-V code to be built on ARM64 Michael Kelley
[not found] ` <20200318031130.5476-1-hdanton@sina.com>
2020-03-19 21:04 ` [PATCH v6 03/10] arm64: hyperv: Add hypercall and register access functions Michael Kelley
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