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KVM: x86/mmu: Apply max PA check for MMIO sptes to 32-bit KVM
Remove the bogus 64-bit only condition from the check that disables MMIO
spte optimization when the system supports the max PA, i.e. doesn't have
any reserved PA bits. 32-bit KVM always uses PAE paging for the shadow
MMU, and per Intel's SDM:
PAE paging translates 32-bit linear addresses to 52-bit physical
addresses.
The kernel's restrictions on max physical addresses are limits on how
much memory the kernel can reasonably use, not what physical addresses
are supported by hardware.
Fixes: ce88decffd
("KVM: MMU: mmio page fault support")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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parent
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@ -6193,7 +6193,7 @@ static void kvm_set_mmio_spte_mask(void)
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* If reserved bit is not supported, clear the present bit to disable
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* mmio page fault.
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*/
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if (IS_ENABLED(CONFIG_X86_64) && shadow_phys_bits == 52)
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if (shadow_phys_bits == 52)
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mask &= ~1ull;
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kvm_mmu_set_mmio_spte_mask(mask, mask, ACC_WRITE_MASK | ACC_USER_MASK);
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