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 1/6] x86: hv: hyperv-tlfs.h: Create and use Hyper-V page definitions
Date: Fri, 5 Apr 2019 01:13:02 +0000 [thread overview]
Message-ID: <0532cc63764f11ce726219a38519b4c9bba1e656.1554426040.git.m.maya.nakamura@gmail.com> (raw)
In-Reply-To: <cover.1554426039.git.m.maya.nakamura@gmail.com>
Define HV_HYP_PAGE_SHIFT, HV_HYP_PAGE_SIZE, and HV_HYP_PAGE_MASK because
the Linux guest page size and hypervisor page size concepts are
different, even though they happen to be the same value on x86.
Also, replace PAGE_SIZE with HV_HYP_PAGE_SIZE.
Signed-off-by: Maya Nakamura <m.maya.nakamura@gmail.com>
---
arch/x86/include/asm/hyperv-tlfs.h | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
index cdf44aa9a501..44bd68aefd00 100644
--- a/arch/x86/include/asm/hyperv-tlfs.h
+++ b/arch/x86/include/asm/hyperv-tlfs.h
@@ -12,6 +12,16 @@
#include <linux/types.h>
#include <asm/page.h>
+/*
+ * While not explicitly listed in the TLFS, Hyper-V always runs with a page size
+ * of 4096. These definitions are used when communicating with Hyper-V using
+ * guest physical pages and guest physical page addresses, since the guest page
+ * size may not be 4096 on all architectures.
+ */
+#define HV_HYP_PAGE_SHIFT 12
+#define HV_HYP_PAGE_SIZE BIT(HV_HYP_PAGE_SHIFT)
+#define HV_HYP_PAGE_MASK (~(HV_HYP_PAGE_SIZE - 1))
+
/*
* The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
* is set by CPUID(HvCpuIdFunctionVersionAndFeatures).
@@ -841,7 +851,7 @@ union hv_gpa_page_range {
* count is equal with how many entries of union hv_gpa_page_range can
* be populated into the input parameter page.
*/
-#define HV_MAX_FLUSH_REP_COUNT ((PAGE_SIZE - 2 * sizeof(u64)) / \
+#define HV_MAX_FLUSH_REP_COUNT ((HV_HYP_PAGE_SIZE - 2 * sizeof(u64)) / \
sizeof(union hv_gpa_page_range))
struct hv_guest_mapping_flush_list {
--
2.17.1
next prev parent reply other threads:[~2019-04-05 1:13 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-05 1:11 [PATCH 0/6] hv: Remove dependencies on guest page size Maya Nakamura
2019-04-05 1:13 ` Maya Nakamura [this message]
2019-04-05 1:14 ` [PATCH 2/6] x86: hv: hv_init.c: Replace alloc_page() with kmem_cache_alloc() Maya Nakamura
2019-04-05 11:31 ` Vitaly Kuznetsov
2019-04-12 7:24 ` Maya Nakamura
2019-04-12 7:52 ` Vitaly Kuznetsov
2019-05-08 6:46 ` Maya Nakamura
2019-05-08 14:54 ` Vitaly Kuznetsov
[not found] ` <BYAPR21MB1317AC7CA4B242106FCAD698CC320@BYAPR21MB1317.namprd21.prod.outlook.com>
2019-05-08 19:53 ` Vitaly Kuznetsov
[not found] ` <MN2PR21MB1232C6ABA5DAC847C8A910E1D70C0@MN2PR21MB1232.namprd21.prod.outlook.com>
2019-05-10 13:21 ` Vitaly Kuznetsov
[not found] ` <BYAPR21MB1221962ED2DD7FEE19E7DAB6D70C0@BYAPR21MB1221.namprd21.prod.outlook.com>
2019-05-10 17:45 ` Vitaly Kuznetsov
2019-04-05 1:16 ` [PATCH 3/6] hv: vmbus: Replace page definition with Hyper-V specific one Maya Nakamura
2019-04-05 1:17 ` [PATCH 4/6] x86: hv: mmu.c: Replace page definitions with Hyper-V specific ones Maya Nakamura
2019-04-05 11:10 ` Vitaly Kuznetsov
[not found] ` <DM5PR2101MB091843B6DD7A11C2C27917F1D7280@DM5PR2101MB0918.namprd21.prod.outlook.com>
2019-04-12 6:58 ` Vitaly Kuznetsov
2019-04-05 1:19 ` [PATCH 5/6] HID: hv: Remove dependencies on PAGE_SIZE for ring buffer Maya Nakamura
2019-04-05 1:20 ` [PATCH 6/6] Input: " Maya Nakamura
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