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KVM: MMU: Emulate #PF error code of reserved bits violation

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Detect, indicate, and propagate page faults where reserved bits are set.
Take care to handle the different paging modes, each of which has different
sets of reserved bits.

[avi: fix pte reserved bits for efer.nxe=0]

Signed-off-by: Eddie Dong <eddie.dong@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Dong, Eddie
2009-03-30 16:21:08 +08:00
committed by Avi Kivity
parent 362c1055e5
commit 82725b20e2
4 changed files with 88 additions and 0 deletions
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7
arch/x86/kvm/paging_tmpl.h
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@@ -123,6 +123,7 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
gfn_t table_gfn;
unsigned index, pt_access, pte_access;
gpa_t pte_gpa;
int rsvd_fault = 0;
pgprintk("%s: addr %lx\n", __func__, addr);
walk:
@@ -157,6 +158,10 @@ walk:
if (!is_present_pte(pte))
goto not_present;
rsvd_fault = is_rsvd_bits_set(vcpu, pte, walker->level);
if (rsvd_fault)
goto access_error;
if (write_fault && !is_writeble_pte(pte))
if (user_fault || is_write_protection(vcpu))
goto access_error;
@@ -232,6 +237,8 @@ err:
walker->error_code |= PFERR_USER_MASK;
if (fetch_fault)
walker->error_code |= PFERR_FETCH_MASK;
if (rsvd_fault)
walker->error_code |= PFERR_RSVD_MASK;
return 0;
}