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| author | Sean Christopherson <sean.j.christopherson@intel.com> | 2019-02-05 13:01:15 -0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-02-20 22:48:35 +0100 |
| commit | 5192f9b976f9687569a90602b8a6c053da4498f6 (patch) | |
| tree | 13152edf16a5627d5ca9ade3704e01b6120a6c7a /arch/x86 | |
| parent | 361209e054a2c9f34da090ee1ee4c1e8bfe76a64 (diff) | |
| download | linux-0-day-5192f9b976f9687569a90602b8a6c053da4498f6.tar.gz linux-0-day-5192f9b976f9687569a90602b8a6c053da4498f6.tar.xz | |
KVM: x86: Use a u64 when passing the MMIO gen around
KVM currently uses an 'unsigned int' for the MMIO generation number
despite it being derived from the 64-bit memslots generation and
being propagated to (potentially) 64-bit sptes. There is no hidden
agenda behind using an 'unsigned int', it's done simply because the
MMIO generation will never set bits above bit 19.
Passing a u64 will allow the "update in-progress" flag to be relocated
from bit 0 to bit 63 and removes the need to cast the generation back
to a u64 when propagating it to a spte.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index c2f2c9de63ed9..54bb706e40e8d 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -348,20 +348,20 @@ static inline bool is_access_track_spte(u64 spte) #define MMIO_GEN_LOW_MASK ((1 << MMIO_GEN_LOW_SHIFT) - 2) #define MMIO_GEN_MASK ((1 << MMIO_GEN_SHIFT) - 1) -static u64 generation_mmio_spte_mask(unsigned int gen) +static u64 generation_mmio_spte_mask(u64 gen) { u64 mask; WARN_ON(gen & ~MMIO_GEN_MASK); mask = (gen & MMIO_GEN_LOW_MASK) << MMIO_SPTE_GEN_LOW_SHIFT; - mask |= ((u64)gen >> MMIO_GEN_LOW_SHIFT) << MMIO_SPTE_GEN_HIGH_SHIFT; + mask |= (gen >> MMIO_GEN_LOW_SHIFT) << MMIO_SPTE_GEN_HIGH_SHIFT; return mask; } -static unsigned int get_mmio_spte_generation(u64 spte) +static u64 get_mmio_spte_generation(u64 spte) { - unsigned int gen; + u64 gen; spte &= ~shadow_mmio_mask; @@ -370,7 +370,7 @@ static unsigned int get_mmio_spte_generation(u64 spte) return gen; } -static unsigned int kvm_current_mmio_generation(struct kvm_vcpu *vcpu) +static u64 kvm_current_mmio_generation(struct kvm_vcpu *vcpu) { return kvm_vcpu_memslots(vcpu)->generation & MMIO_GEN_MASK; } @@ -378,7 +378,7 @@ static unsigned int kvm_current_mmio_generation(struct kvm_vcpu *vcpu) static void mark_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, u64 gfn, unsigned access) { - unsigned int gen = kvm_current_mmio_generation(vcpu); + u64 gen = kvm_current_mmio_generation(vcpu); u64 mask = generation_mmio_spte_mask(gen); u64 gpa = gfn << PAGE_SHIFT; @@ -426,7 +426,7 @@ static bool set_mmio_spte(struct kvm_vcpu *vcpu, u64 *sptep, gfn_t gfn, static bool check_mmio_spte(struct kvm_vcpu *vcpu, u64 spte) { - unsigned int kvm_gen, spte_gen; + u64 kvm_gen, spte_gen; kvm_gen = kvm_current_mmio_generation(vcpu); spte_gen = get_mmio_spte_generation(spte); |