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KVM: x86/mmu: Sanity check input to kvm_mmu_free_roots()

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Tweak KVM_MMU_ROOTS_ALL to precisely cover all current+previous root
flags, and add a sanity in kvm_mmu_free_roots() to verify that the set
of roots to free doesn't stray outside KVM_MMU_ROOTS_ALL.

Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.com>
Link: https://lore.kernel.org/r/20230216154115.710033-8-jiangshanlai@gmail.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2023-02-16 23:41:13 +08:00
parent e6722d9211
commit f94db0c8b9
2 changed files with 6 additions and 4 deletions
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8
arch/x86/include/asm/kvm_host.h
View File

@ -420,6 +420,10 @@ struct kvm_mmu_root_info {
#define KVM_MMU_NUM_PREV_ROOTS 3
#define KVM_MMU_ROOT_CURRENT BIT(0)
#define KVM_MMU_ROOT_PREVIOUS(i) BIT(1+i)
#define KVM_MMU_ROOTS_ALL (BIT(1 + KVM_MMU_NUM_PREV_ROOTS) - 1)
#define KVM_HAVE_MMU_RWLOCK
struct kvm_mmu_page;
@ -1997,10 +2001,6 @@ static inline int __kvm_irq_line_state(unsigned long *irq_state,
return !!(*irq_state);
}
#define KVM_MMU_ROOT_CURRENT BIT(0)
#define KVM_MMU_ROOT_PREVIOUS(i) BIT(1+i)
#define KVM_MMU_ROOTS_ALL (~0UL)
int kvm_pic_set_irq(struct kvm_pic *pic, int irq, int irq_source_id, int level);
void kvm_pic_clear_all(struct kvm_pic *pic, int irq_source_id);

2
arch/x86/kvm/mmu/mmu.c
View File

@ -3568,6 +3568,8 @@ void kvm_mmu_free_roots(struct kvm *kvm, struct kvm_mmu *mmu,
LIST_HEAD(invalid_list);
bool free_active_root;
WARN_ON_ONCE(roots_to_free & ~KVM_MMU_ROOTS_ALL);
BUILD_BUG_ON(KVM_MMU_NUM_PREV_ROOTS >= BITS_PER_LONG);
/* Before acquiring the MMU lock, see if we need to do any real work. */