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KVM: MMU: Introduce struct kvm_page_fault

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Create a single structure for arguments that are passed from
kvm_mmu_do_page_fault to the page fault handlers.  Later
the structure will grow to include various output parameters
that are passed back to the next steps in the page fault
handling.

Suggested-by: Isaku Yamahata <isaku.yamahata@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-08-06 03:52:18 -04:00
parent d055f028a5
commit 6defd9bb17
1 changed files with 31 additions and 3 deletions
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34
arch/x86/kvm/mmu.h
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@ -114,17 +114,45 @@ static inline void kvm_mmu_load_pgd(struct kvm_vcpu *vcpu)
vcpu->arch.mmu->shadow_root_level);
}
struct kvm_page_fault {
/* arguments to kvm_mmu_do_page_fault. */
const gpa_t addr;
const u32 error_code;
const bool prefault;
/* Derived from error_code. */
const bool exec;
const bool write;
const bool present;
const bool rsvd;
const bool user;
/* Derived from mmu. */
const bool is_tdp;
};
int kvm_tdp_page_fault(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code,
bool prefault);
static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
u32 err, bool prefault)
{
struct kvm_page_fault fault = {
.addr = cr2_or_gpa,
.error_code = err,
.exec = err & PFERR_FETCH_MASK,
.write = err & PFERR_WRITE_MASK,
.present = err & PFERR_PRESENT_MASK,
.rsvd = err & PFERR_RSVD_MASK,
.user = err & PFERR_USER_MASK,
.prefault = prefault,
.is_tdp = likely(vcpu->arch.mmu->page_fault == kvm_tdp_page_fault),
};
#ifdef CONFIG_RETPOLINE
if (likely(vcpu->arch.mmu->page_fault == kvm_tdp_page_fault))
return kvm_tdp_page_fault(vcpu, cr2_or_gpa, err, prefault);
if (fault.is_tdp)
return kvm_tdp_page_fault(vcpu, fault.addr, fault.error_code, fault.prefault);
#endif
return vcpu->arch.mmu->page_fault(vcpu, cr2_or_gpa, err, prefault);
return vcpu->arch.mmu->page_fault(vcpu, fault.addr, fault.error_code, fault.prefault);
}
/*