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authorNadav Amit <namit@cs.technion.ac.il>2014-05-07 15:32:50 +0300
committerPaolo Bonzini <pbonzini@redhat.com>2014-05-07 17:25:22 +0200
commit5f7dde7bbb3c628766676cbd63c0a1834035d6fa (patch)
tree39fde3ae31697b7e1ef19af9f1d3d626d0f7e909 /arch/x86/kvm/mmu.c
parenta4ab9d0cf1ef0bf521bb69099aa464f38c71393c (diff)
KVM: x86: Mark bit 7 in long-mode PDPTE according to 1GB pages support
In long-mode, bit 7 in the PDPTE is not reserved only if 1GB pages are supported by the CPU. Currently the bit is considered by KVM as always reserved. Signed-off-by: Nadav Amit <namit@cs.technion.ac.il> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu.c')
-rw-r--r--arch/x86/kvm/mmu.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 65f2400b8268..931467881da7 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -22,6 +22,7 @@
#include "mmu.h"
#include "x86.h"
#include "kvm_cache_regs.h"
+#include "cpuid.h"
#include <linux/kvm_host.h>
#include <linux/types.h>
@@ -3516,11 +3517,14 @@ static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
{
int maxphyaddr = cpuid_maxphyaddr(vcpu);
u64 exb_bit_rsvd = 0;
+ u64 gbpages_bit_rsvd = 0;
context->bad_mt_xwr = 0;
if (!context->nx)
exb_bit_rsvd = rsvd_bits(63, 63);
+ if (!guest_cpuid_has_gbpages(vcpu))
+ gbpages_bit_rsvd = rsvd_bits(7, 7);
switch (context->root_level) {
case PT32_ROOT_LEVEL:
/* no rsvd bits for 2 level 4K page table entries */
@@ -3557,14 +3561,14 @@ static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu,
context->rsvd_bits_mask[0][3] = exb_bit_rsvd |
rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 7);
context->rsvd_bits_mask[0][2] = exb_bit_rsvd |
- rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 7);
+ gbpages_bit_rsvd | rsvd_bits(maxphyaddr, 51);
context->rsvd_bits_mask[0][1] = exb_bit_rsvd |
rsvd_bits(maxphyaddr, 51);
context->rsvd_bits_mask[0][0] = exb_bit_rsvd |
rsvd_bits(maxphyaddr, 51);
context->rsvd_bits_mask[1][3] = context->rsvd_bits_mask[0][3];
context->rsvd_bits_mask[1][2] = exb_bit_rsvd |
- rsvd_bits(maxphyaddr, 51) |
+ gbpages_bit_rsvd | rsvd_bits(maxphyaddr, 51) |
rsvd_bits(13, 29);
context->rsvd_bits_mask[1][1] = exb_bit_rsvd |
rsvd_bits(maxphyaddr, 51) |