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KVM: x86/mmu: Move "dummy root" helpers to spte.h

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Move the helpers to get/query a dummy root from mmu_internal.h to spte.h
so that VMX can detect and handle dummy roots when constructing EPTPs.
This will allow using the root's role to build the EPTP instead of pulling
equivalent information out of the vCPU structure.

No functional change intended.

Link: https://lore.kernel.org/r/20250919005955.1366256-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2025-09-18 17:59:49 -07:00
parent a8749281e4
commit a10f5cc3ac
2 changed files with 10 additions and 10 deletions
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10
arch/x86/kvm/mmu/mmu_internal.h
View File

@@ -39,16 +39,6 @@
#define INVALID_PAE_ROOT 0
#define IS_VALID_PAE_ROOT(x) (!!(x))
static inline hpa_t kvm_mmu_get_dummy_root(void)
{
return my_zero_pfn(0) << PAGE_SHIFT;
}
static inline bool kvm_mmu_is_dummy_root(hpa_t shadow_page)
{
return is_zero_pfn(shadow_page >> PAGE_SHIFT);
}
typedef u64 __rcu *tdp_ptep_t;
struct kvm_mmu_page {

10
arch/x86/kvm/mmu/spte.h
View File

@@ -246,6 +246,16 @@ static inline int spte_index(u64 *sptep)
*/
extern u64 __read_mostly shadow_nonpresent_or_rsvd_lower_gfn_mask;
static inline hpa_t kvm_mmu_get_dummy_root(void)
{
return my_zero_pfn(0) << PAGE_SHIFT;
}
static inline bool kvm_mmu_is_dummy_root(hpa_t shadow_page)
{
return is_zero_pfn(shadow_page >> PAGE_SHIFT);
}
static inline struct kvm_mmu_page *to_shadow_page(hpa_t shadow_page)
{
struct page *page = pfn_to_page((shadow_page) >> PAGE_SHIFT);