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Message-Id: <20210820155918.7518-30-brijesh.singh@amd.com>
Date: Fri, 20 Aug 2021 10:59:02 -0500
From: Brijesh Singh <brijesh.singh@....com>
To: x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
linux-coco@...ts.linux.dev, linux-mm@...ck.org,
linux-crypto@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
Tom Lendacky <thomas.lendacky@....com>,
"H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
Paolo Bonzini <pbonzini@...hat.com>,
Sean Christopherson <seanjc@...gle.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Andy Lutomirski <luto@...nel.org>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
Peter Zijlstra <peterz@...radead.org>,
Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
David Rientjes <rientjes@...gle.com>,
Dov Murik <dovmurik@...ux.ibm.com>,
Tobin Feldman-Fitzthum <tobin@....com>,
Borislav Petkov <bp@...en8.de>,
Michael Roth <michael.roth@....com>,
Vlastimil Babka <vbabka@...e.cz>,
"Kirill A . Shutemov" <kirill@...temov.name>,
Andi Kleen <ak@...ux.intel.com>, tony.luck@...el.com,
marcorr@...gle.com, sathyanarayanan.kuppuswamy@...ux.intel.com,
Sean Christopherson <sean.j.christopherson@...el.com>,
Isaku Yamahata <isaku.yamahata@...el.com>,
Brijesh Singh <brijesh.singh@....com>
Subject: [PATCH Part2 v5 29/45] KVM: x86/mmu: Move 'pfn' variable to caller of direct_page_fault()
From: Sean Christopherson <sean.j.christopherson@...el.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@...el.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
Signed-off-by: Brijesh Singh <brijesh.singh@....com>
---
arch/x86/kvm/mmu/mmu.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index f9aaf6e1e51e..5cbcbedcaaa6 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -3818,7 +3818,8 @@ 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 is_tdp_mmu_fault = is_tdp_mmu(vcpu->arch.mmu);
bool write = error_code & PFERR_WRITE_MASK;
@@ -3826,7 +3827,6 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
gfn_t gfn = gpa >> PAGE_SHIFT;
unsigned long mmu_seq;
- kvm_pfn_t pfn;
hva_t hva;
int r;
@@ -3846,11 +3846,11 @@ 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;
@@ -3860,7 +3860,8 @@ 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)
@@ -3868,9 +3869,9 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
if (is_tdp_mmu_fault)
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,
+ r = __direct_map(vcpu, gpa, error_code, map_writable, max_level, *pfn,
prefault, is_tdp);
out_unlock:
@@ -3878,18 +3879,20 @@ static int direct_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
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,
@@ -3928,6 +3931,7 @@ 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;
@@ -3941,7 +3945,7 @@ 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_mmu *context)
--
2.17.1
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