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KVM: x86/mmu: Use common logic for computing the 32/64-bit base PA mask

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Use common logic for computing PT_BASE_ADDR_MASK for 32-bit, 64-bit, and
EPT paging.  Both PAGE_MASK and the new-common logic are supsersets of
what is actually needed for 32-bit paging.  PAGE_MASK sets bits 63:12 and
the former GUEST_PT64_BASE_ADDR_MASK sets bits 51:12, so regardless of
which value is used, the result will always be bits 31:12.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220614233328.3896033-9-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-06-14 23:33:28 +00:00 committed by Paolo Bonzini
parent f7384b8866
commit 70e41c31bc
3 changed files with 1 additions and 14 deletions
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2
arch/x86/kvm/mmu/mmu.c
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@ -53,8 +53,6 @@
#include <asm/kvm_page_track.h>
#include "trace.h"
#include "paging.h"
extern bool itlb_multihit_kvm_mitigation;
int __read_mostly nx_huge_pages = -1;

9
arch/x86/kvm/mmu/paging.h
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@ -1,9 +0,0 @@
/* SPDX-License-Identifier: GPL-2.0-only */
/* Shadow paging constants/helpers that don't need to be #undef'd. */
#ifndef __KVM_X86_PAGING_H
#define __KVM_X86_PAGING_H
#define GUEST_PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1))
#endif /* __KVM_X86_PAGING_H */

4
arch/x86/kvm/mmu/paging_tmpl.h
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@ -25,7 +25,6 @@
#define pt_element_t u64
#define guest_walker guest_walker64
#define FNAME(name) paging##64_##name
#define PT_BASE_ADDR_MASK GUEST_PT64_BASE_ADDR_MASK
#define PT_LEVEL_BITS 9
#define PT_GUEST_DIRTY_SHIFT PT_DIRTY_SHIFT
#define PT_GUEST_ACCESSED_SHIFT PT_ACCESSED_SHIFT
@ -39,7 +38,6 @@
#define pt_element_t u32
#define guest_walker guest_walker32
#define FNAME(name) paging##32_##name
#define PT_BASE_ADDR_MASK ((pt_element_t)PAGE_MASK)
#define PT_LEVEL_BITS 10
#define PT_MAX_FULL_LEVELS 2
#define PT_GUEST_DIRTY_SHIFT PT_DIRTY_SHIFT
@ -54,7 +52,6 @@
#define pt_element_t u64
#define guest_walker guest_walkerEPT
#define FNAME(name) ept_##name
#define PT_BASE_ADDR_MASK GUEST_PT64_BASE_ADDR_MASK
#define PT_LEVEL_BITS 9
#define PT_GUEST_DIRTY_SHIFT 9
#define PT_GUEST_ACCESSED_SHIFT 8
@ -65,6 +62,7 @@
#endif
/* Common logic, but per-type values. These also need to be undefined. */
#define PT_BASE_ADDR_MASK ((pt_element_t)(((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1)))
#define PT_LVL_ADDR_MASK(lvl) __PT_LVL_ADDR_MASK(PT_BASE_ADDR_MASK, lvl, PT_LEVEL_BITS)
#define PT_LVL_OFFSET_MASK(lvl) __PT_LVL_OFFSET_MASK(PT_BASE_ADDR_MASK, lvl, PT_LEVEL_BITS)
#define PT_INDEX(addr, lvl) __PT_INDEX(addr, lvl, PT_LEVEL_BITS)