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KVM: MMU: Expose the LA57 feature to VM.

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This patch exposes 5 level page table feature to the VM.
At the same time, the canonical virtual address checking is
extended to support both 48-bits and 57-bits address width.

Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Yu Zhang
2017-08-24 20:27:56 +08:00
committed by Paolo Bonzini
parent 855feb6736
commit fd8cb43373
7 changed files with 65 additions and 36 deletions
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16
arch/x86/kvm/emulate.c
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@@ -689,16 +689,18 @@ static __always_inline int __linearize(struct x86_emulate_ctxt *ctxt,
ulong la;
u32 lim;
u16 sel;
u8 va_bits;
la = seg_base(ctxt, addr.seg) + addr.ea;
*max_size = 0;
switch (mode) {
case X86EMUL_MODE_PROT64:
*linear = la;
if (is_noncanonical_address(la))
va_bits = ctxt_virt_addr_bits(ctxt);
if (get_canonical(la, va_bits) != la)
goto bad;
*max_size = min_t(u64, ~0u, (1ull << 48) - la);
*max_size = min_t(u64, ~0u, (1ull << va_bits) - la);
if (size > *max_size)
goto bad;
break;
@@ -1749,8 +1751,8 @@ static int __load_segment_descriptor(struct x86_emulate_ctxt *ctxt,
sizeof(base3), &ctxt->exception);
if (ret != X86EMUL_CONTINUE)
return ret;
if (is_noncanonical_address(get_desc_base(&seg_desc) |
((u64)base3 << 32)))
if (emul_is_noncanonical_address(get_desc_base(&seg_desc) |
((u64)base3 << 32), ctxt))
return emulate_gp(ctxt, 0);
}
load:
@@ -2841,8 +2843,8 @@ static int em_sysexit(struct x86_emulate_ctxt *ctxt)
ss_sel = cs_sel + 8;
cs.d = 0;
cs.l = 1;
if (is_noncanonical_address(rcx) ||
is_noncanonical_address(rdx))
if (emul_is_noncanonical_address(rcx, ctxt) ||
emul_is_noncanonical_address(rdx, ctxt))
return emulate_gp(ctxt, 0);
break;
}
@@ -3757,7 +3759,7 @@ static int em_lgdt_lidt(struct x86_emulate_ctxt *ctxt, bool lgdt)
if (rc != X86EMUL_CONTINUE)
return rc;
if (ctxt->mode == X86EMUL_MODE_PROT64 &&
is_noncanonical_address(desc_ptr.address))
emul_is_noncanonical_address(desc_ptr.address, ctxt))
return emulate_gp(ctxt, 0);
if (lgdt)
ctxt->ops->set_gdt(ctxt, &desc_ptr);