[PATCH] kvm: x86: Adjust the location of pkru_mask of kvm_mmu to reduce memory
From: Peng Hao <hidden>
Date: 2022-02-28 03:09:21
Also in:
lkml
Subsystem:
kernel virtual machine for x86 (kvm/x86), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Sean Christopherson, Paolo Bonzini, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
From: Peng Hao <redacted> 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 <redacted> --- 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;
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2.27.0