Commit fd275235 authored by Paolo Bonzini's avatar Paolo Bonzini

KVM: x86: use guest maxphyaddr to check MTRR values

The check introduced in commit d7a2a246 (KVM: x86: #GP when attempts to write reserved bits of Variable Range MTRRs, 2014-08-19)
will break if the guest maxphyaddr is higher than the host's (which
sometimes happens depending on your hardware and how QEMU is
configured).

To fix this, use cpuid_maxphyaddr similar to how the APIC_BASE MSR
does already.
Reported-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
Tested-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 13a34e06
...@@ -1726,7 +1726,7 @@ static bool valid_mtrr_type(unsigned t) ...@@ -1726,7 +1726,7 @@ static bool valid_mtrr_type(unsigned t)
static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data) static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{ {
int i; int i;
u64 mask = 0; u64 mask;
if (!msr_mtrr_valid(msr)) if (!msr_mtrr_valid(msr))
return false; return false;
...@@ -1750,8 +1750,7 @@ static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data) ...@@ -1750,8 +1750,7 @@ static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
/* variable MTRRs */ /* variable MTRRs */
WARN_ON(!(msr >= 0x200 && msr < 0x200 + 2 * KVM_NR_VAR_MTRR)); WARN_ON(!(msr >= 0x200 && msr < 0x200 + 2 * KVM_NR_VAR_MTRR));
for (i = 63; i > boot_cpu_data.x86_phys_bits; i--) mask = (~0ULL) << cpuid_maxphyaddr(vcpu);
mask |= (1ULL << i);
if ((msr & 1) == 0) { if ((msr & 1) == 0) {
/* MTRR base */ /* MTRR base */
if (!valid_mtrr_type(data & 0xff)) if (!valid_mtrr_type(data & 0xff))
......
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