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KVM: x86/mmu: Convert page fault paths to kvm_faultin_pfn()

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Convert KVM x86 to use the recently introduced __kvm_faultin_pfn().
Opportunstically capture the refcounted_page grabbed by KVM for use in
future changes.

No functional change intended.

Tested-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Tested-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20241010182427.1434605-45-seanjc@google.com>
This commit is contained in:
Sean Christopherson 2024-10-10 11:23:46 -07:00 committed by Paolo Bonzini
parent 1c7b627e93
commit 54ba8c98a2
2 changed files with 11 additions and 4 deletions
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14
arch/x86/kvm/mmu/mmu.c
View File

@ -4423,11 +4423,14 @@ static int kvm_mmu_faultin_pfn_private(struct kvm_vcpu *vcpu,
static int __kvm_mmu_faultin_pfn(struct kvm_vcpu *vcpu,
struct kvm_page_fault *fault)
{
unsigned int foll = fault->write ? FOLL_WRITE : 0;
if (fault->is_private)
return kvm_mmu_faultin_pfn_private(vcpu, fault);
fault->pfn = __gfn_to_pfn_memslot(fault->slot, fault->gfn, false, true,
fault->write, &fault->map_writable);
foll |= FOLL_NOWAIT;
fault->pfn = __kvm_faultin_pfn(fault->slot, fault->gfn, foll,
&fault->map_writable, &fault->refcounted_page);
/*
* If resolving the page failed because I/O is needed to fault-in the
@ -4454,8 +4457,11 @@ static int __kvm_mmu_faultin_pfn(struct kvm_vcpu *vcpu,
* to wait for IO. Note, gup always bails if it is unable to quickly
* get a page and a fatal signal, i.e. SIGKILL, is pending.
*/
fault->pfn = __gfn_to_pfn_memslot(fault->slot, fault->gfn, true, true,
fault->write, &fault->map_writable);
foll |= FOLL_INTERRUPTIBLE;
foll &= ~FOLL_NOWAIT;
fault->pfn = __kvm_faultin_pfn(fault->slot, fault->gfn, foll,
&fault->map_writable, &fault->refcounted_page);
return RET_PF_CONTINUE;
}

1
arch/x86/kvm/mmu/mmu_internal.h
View File

@ -238,6 +238,7 @@ struct kvm_page_fault {
/* Outputs of kvm_mmu_faultin_pfn(). */
unsigned long mmu_seq;
kvm_pfn_t pfn;
struct page *refcounted_page;
bool map_writable;
/*