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Subject[RFC PATCH v2 47/69] KVM: x86/mmu: Move 'pfn' variable to caller of direct_page_fault()
Date
From: Sean Christopherson <sean.j.christopherson@intel.com>

When adding pages prior to boot, TDX will need the resulting host pfn so
that it can be passed to TDADDPAGE (TDX-SEAM always works with physical
addresses as it has its own page tables). Start plumbing pfn back up
the page fault stack.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
arch/x86/kvm/mmu/mmu.c | 26 +++++++++++++++-----------
1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index c343e546b7c5..96a99450f114 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -3969,14 +3969,14 @@ static bool try_async_pf(struct kvm_vcpu *vcpu, bool prefault, gfn_t gfn,
}

static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
- bool prefault, int max_level, bool is_tdp)
+ bool prefault, int max_level, bool is_tdp,
+ kvm_pfn_t *pfn)
{
bool write = error_code & PFERR_WRITE_MASK;
bool map_writable;

gfn_t gfn = vcpu_gpa_to_gfn_unalias(vcpu, gpa);
unsigned long mmu_seq;
- kvm_pfn_t pfn;
hva_t hva;
int r;

@@ -3996,11 +3996,11 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
mmu_seq = vcpu->kvm->mmu_notifier_seq;
smp_rmb();

- if (try_async_pf(vcpu, prefault, gfn, gpa, &pfn, &hva,
+ if (try_async_pf(vcpu, prefault, gfn, gpa, pfn, &hva,
write, &map_writable))
return RET_PF_RETRY;

- if (handle_abnormal_pfn(vcpu, is_tdp ? 0 : gpa, gfn, pfn, ACC_ALL, &r))
+ if (handle_abnormal_pfn(vcpu, is_tdp ? 0 : gpa, gfn, *pfn, ACC_ALL, &r))
return r;

r = RET_PF_RETRY;
@@ -4010,7 +4010,8 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
else
write_lock(&vcpu->kvm->mmu_lock);

- if (!is_noslot_pfn(pfn) && mmu_notifier_retry_hva(vcpu->kvm, mmu_seq, hva))
+ if (!is_noslot_pfn(*pfn) &&
+ mmu_notifier_retry_hva(vcpu->kvm, mmu_seq, hva))
goto out_unlock;
r = make_mmu_pages_available(vcpu);
if (r)
@@ -4018,28 +4019,30 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,

if (is_tdp_mmu_root(vcpu->kvm, vcpu->arch.mmu->root_hpa))
r = kvm_tdp_mmu_map(vcpu, gpa, error_code, map_writable, max_level,
- pfn, prefault);
+ *pfn, prefault);
else
- r = __direct_map(vcpu, gpa, error_code, map_writable, max_level, pfn,
- prefault, is_tdp);
+ r = __direct_map(vcpu, gpa, error_code, map_writable, max_level,
+ *pfn, prefault, is_tdp);

out_unlock:
if (is_tdp_mmu_root(vcpu->kvm, vcpu->arch.mmu->root_hpa))
read_unlock(&vcpu->kvm->mmu_lock);
else
write_unlock(&vcpu->kvm->mmu_lock);
- kvm_release_pfn_clean(pfn);
+ kvm_release_pfn_clean(*pfn);
return r;
}

static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa,
u32 error_code, bool prefault)
{
+ kvm_pfn_t pfn;
+
pgprintk("%s: gva %lx error %x\n", __func__, gpa, error_code);

/* This path builds a PAE pagetable, we can map 2mb pages at maximum. */
return direct_page_fault(vcpu, gpa & PAGE_MASK, error_code, prefault,
- PG_LEVEL_2M, false);
+ PG_LEVEL_2M, false, &pfn);
}

int kvm_handle_page_fault(struct kvm_vcpu *vcpu, u64 error_code,
@@ -4078,6 +4081,7 @@ EXPORT_SYMBOL_GPL(kvm_handle_page_fault);
int kvm_tdp_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
bool prefault)
{
+ kvm_pfn_t pfn;
int max_level;

for (max_level = KVM_MAX_HUGEPAGE_LEVEL;
@@ -4091,7 +4095,7 @@ int kvm_tdp_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
}

return direct_page_fault(vcpu, gpa, error_code, prefault,
- max_level, true);
+ max_level, true, &pfn);
}

static void nonpaging_init_context(struct kvm_vcpu *vcpu,
--
2.25.1
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