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Date: Mon, 28 Feb 2022 11:07:49 +0800
From: Peng Hao <flyingpenghao@...il.com>
To: pbonzini@...hat.com
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] kvm: x86: Adjust the location of pkru_mask of kvm_mmu to reduce memory
From: Peng Hao <flyingpeng@...cent.com>
Adjust the field pkru_mask to the back of direct_map to make up 8-byte
alignment.This reduces the size of kvm_mmu by 8 bytes.
Signed-off-by: Peng Hao <flyingpeng@...cent.com>
---
arch/x86/include/asm/kvm_host.h | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index e5d8700319cc..73dcb09abd5d 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -433,14 +433,6 @@ struct kvm_mmu {
u8 shadow_root_level;
u8 ept_ad;
bool direct_map;
- struct kvm_mmu_root_info prev_roots[KVM_MMU_NUM_PREV_ROOTS];
-
- /*
- * Bitmap; bit set = permission fault
- * Byte index: page fault error code [4:1]
- * Bit index: pte permissions in ACC_* format
- */
- u8 permissions[16];
/*
* The pkru_mask indicates if protection key checks are needed. It
@@ -450,6 +442,15 @@ struct kvm_mmu {
*/
u32 pkru_mask;
+ struct kvm_mmu_root_info prev_roots[KVM_MMU_NUM_PREV_ROOTS];
+
+ /*
+ * Bitmap; bit set = permission fault
+ * Byte index: page fault error code [4:1]
+ * Bit index: pte permissions in ACC_* format
+ */
+ u8 permissions[16];
+
u64 *pae_root;
u64 *pml4_root;
u64 *pml5_root;
--
2.27.0
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