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Message-ID: <01d19ae7b855d72f6f4fa09bd954aeb3863d170f.1560837096.git.m.maya.nakamura@gmail.com>
Date: Tue, 18 Jun 2019 06:11:22 +0000
From: Maya Nakamura <m.maya.nakamura@...il.com>
To: mikelley@...rosoft.com, kys@...rosoft.com, haiyangz@...rosoft.com,
sthemmin@...rosoft.com, sashal@...nel.org
Cc: x86@...nel.org, linux-hyperv@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/5] x86: hv: hyperv-tlfs.h: Create and use Hyper-V page
definitions
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@...il.com>
Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@...hat.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 af78cd72b8f3..4097edf552b3 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).
@@ -847,7 +857,7 @@ 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
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