The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 6129ed877d409037b79866327102c9dc59a302fe Mon Sep 17 00:00:00 2001
From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Date: Wed, 27 May 2020 01:49:09 -0700
Subject: [PATCH] KVM: x86/mmu: Set mmio_value to '0' if reserved #PF can't be
generated
Set the mmio_value to '0' instead of simply clearing the present bit to
squash a benign warning in kvm_mmu_set_mmio_spte_mask() that complains
about the mmio_value overlapping the lower GFN mask on systems with 52
bits of PA space.
Opportunistically clean up the code and comments.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: d43e2675e96fc ("KVM: x86: only do L1TF workaround on affected processors")
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Message-Id: <20200527084909.23492-1-sean.j.christopherson@xxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 86619631ff6a..92d056954194 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -6143,25 +6143,16 @@ static void kvm_set_mmio_spte_mask(void)
u64 mask;
/*
- * Set the reserved bits and the present bit of an paging-structure
- * entry to generate page fault with PFER.RSV = 1.
+ * Set a reserved PA bit in MMIO SPTEs to generate page faults with
+ * PFEC.RSVD=1 on MMIO accesses. 64-bit PTEs (PAE, x86-64, and EPT
+ * paging) support a maximum of 52 bits of PA, i.e. if the CPU supports
+ * 52-bit physical addresses then there are no reserved PA bits in the
+ * PTEs and so the reserved PA approach must be disabled.
*/
-
- /*
- * Mask the uppermost physical address bit, which would be reserved as
- * long as the supported physical address width is less than 52.
- */
- mask = 1ull << 51;
-
- /* Set the present bit. */
- mask |= 1ull;
-
- /*
- * If reserved bit is not supported, clear the present bit to disable
- * mmio page fault.
- */
- if (shadow_phys_bits == 52)
- mask &= ~1ull;
+ if (shadow_phys_bits < 52)
+ mask = BIT_ULL(51) | PT_PRESENT_MASK;
+ else
+ mask = 0;
kvm_mmu_set_mmio_spte_mask(mask, mask, ACC_WRITE_MASK | ACC_USER_MASK);
}
