[PATCH 4.9 21/31] KVM: x86: remove now unneeded hugepage gfn adjustment

Greg Kroah-Hartman
2019-11-15T06:22:30Z

From: Paolo Bonzini <pbonzini@redhat.com>

commit d679b32611c0102ce33b9e1a4e4b94854ed1812a upstream.

After the previous patch, the low bits of the gfn are masked in
both FNAME(fetch) and __direct_map, so we do not need to clear them
in transparent_hugepage_adjust.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/kvm/mmu.c | 9 +++------
arch/x86/kvm/paging_tmpl.h | 2 +-
2 files changed, 4 insertions(+), 7 deletions(-)

--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -2824,11 +2824,10 @@ static int kvm_handle_bad_page(struct kv
}

static void transparent_hugepage_adjust(struct kvm_vcpu *vcpu,
- gfn_t *gfnp, kvm_pfn_t *pfnp,
+ gfn_t gfn, kvm_pfn_t *pfnp,
int *levelp)
{
kvm_pfn_t pfn = *pfnp;
- gfn_t gfn = *gfnp;
int level = *levelp;

/*
@@ -2855,8 +2854,6 @@ static void transparent_hugepage_adjust(
mask = KVM_PAGES_PER_HPAGE(level) - 1;
VM_BUG_ON((gfn & mask) != (pfn & mask));
if (pfn & mask) {
- gfn &= ~mask;
- *gfnp = gfn;
kvm_release_pfn_clean(pfn);
pfn &= ~mask;
kvm_get_pfn(pfn);
@@ -3060,7 +3057,7 @@ static int nonpaging_map(struct kvm_vcpu
goto out_unlock;
make_mmu_pages_available(vcpu);
if (likely(!force_pt_level))
- transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level);
+ transparent_hugepage_adjust(vcpu, gfn, &pfn, &level);
r = __direct_map(vcpu, v, write, map_writable, level, pfn, prefault);
out_unlock:
spin_unlock(&vcpu->kvm->mmu_lock);
@@ -3595,7 +3592,7 @@ static int tdp_page_fault(struct kvm_vcp
goto out_unlock;
make_mmu_pages_available(vcpu);
if (likely(!force_pt_level))
- transparent_hugepage_adjust(vcpu, &gfn, &pfn, &level);
+ transparent_hugepage_adjust(vcpu, gfn, &pfn, &level);
r = __direct_map(vcpu, gpa, write, map_writable, level, pfn, prefault);
out_unlock:
spin_unlock(&vcpu->kvm->mmu_lock);
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -806,7 +806,7 @@ static int FNAME(page_fault)(struct kvm_
kvm_mmu_audit(vcpu, AUDIT_PRE_PAGE_FAULT);
make_mmu_pages_available(vcpu);
if (!force_pt_level)
- transparent_hugepage_adjust(vcpu, &walker.gfn, &pfn, &level);
+ transparent_hugepage_adjust(vcpu, walker.gfn, &pfn, &level);
r = FNAME(fetch)(vcpu, addr, &walker, write_fault,
level, pfn, map_writable, prefault);
kvm_mmu_audit(vcpu, AUDIT_POST_PAGE_FAULT);