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Subject[PATCH 10/12] KVM: x86: Add helper to consolidate "raw" reserved GPA mask calculations
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Add a helper to generate the mask of reserved GPA bits _without_ any
adjustments for repurposed bits, and use it to replace a variety of
open coded variants in the MTRR and APIC_BASE flows.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/cpuid.c | 12 +++++++++++-
arch/x86/kvm/cpuid.h | 1 +
arch/x86/kvm/mtrr.c | 12 ++++++------
arch/x86/kvm/x86.c | 4 ++--
4 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index d313b1804278..dd9406450696 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -188,7 +188,7 @@ static void kvm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
kvm_update_pv_runtime(vcpu);

vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
- vcpu->arch.reserved_gpa_bits = rsvd_bits(cpuid_maxphyaddr(vcpu), 63);
+ vcpu->arch.reserved_gpa_bits = kvm_vcpu_reserved_gpa_bits_raw(vcpu);

kvm_pmu_refresh(vcpu);
vcpu->arch.cr4_guest_rsvd_bits =
@@ -242,6 +242,16 @@ int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu)
return 36;
}

+/*
+ * This "raw" version returns the reserved GPA bits without any adjustments for
+ * encryption technologies that usurp bits. The raw mask should be used if and
+ * only if hardware does _not_ strip the usurped bits, e.g. in virtual MTRRs.
+ */
+u64 kvm_vcpu_reserved_gpa_bits_raw(struct kvm_vcpu *vcpu)
+{
+ return rsvd_bits(cpuid_maxphyaddr(vcpu), 63);
+}
+
/* when an old userspace process fills a new kernel module */
int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
struct kvm_cpuid *cpuid,
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index f673f45bdf52..2a0c5064497f 100644
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -30,6 +30,7 @@ bool kvm_cpuid(struct kvm_vcpu *vcpu, u32 *eax, u32 *ebx,
u32 *ecx, u32 *edx, bool exact_only);

int cpuid_query_maxphyaddr(struct kvm_vcpu *vcpu);
+u64 kvm_vcpu_reserved_gpa_bits_raw(struct kvm_vcpu *vcpu);

static inline int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
{
diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c
index f472fdb6ae7e..a8502e02f479 100644
--- a/arch/x86/kvm/mtrr.c
+++ b/arch/x86/kvm/mtrr.c
@@ -75,7 +75,7 @@ bool kvm_mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
/* variable MTRRs */
WARN_ON(!(msr >= 0x200 && msr < 0x200 + 2 * KVM_NR_VAR_MTRR));

- mask = (~0ULL) << cpuid_maxphyaddr(vcpu);
+ mask = kvm_vcpu_reserved_gpa_bits_raw(vcpu);
if ((msr & 1) == 0) {
/* MTRR base */
if (!valid_mtrr_type(data & 0xff))
@@ -351,14 +351,14 @@ static void set_var_mtrr_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
if (var_mtrr_range_is_valid(cur))
list_del(&mtrr_state->var_ranges[index].node);

- /* Extend the mask with all 1 bits to the left, since those
- * bits must implicitly be 0. The bits are then cleared
- * when reading them.
+ /*
+ * Set all illegal GPA bits in the mask, since those bits must
+ * implicitly be 0. The bits are then cleared when reading them.
*/
if (!is_mtrr_mask)
cur->base = data;
else
- cur->mask = data | (-1LL << cpuid_maxphyaddr(vcpu));
+ cur->mask = data | kvm_vcpu_reserved_gpa_bits_raw(vcpu);

/* add it to the list if it's enabled. */
if (var_mtrr_range_is_valid(cur)) {
@@ -426,7 +426,7 @@ int kvm_mtrr_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
else
*pdata = vcpu->arch.mtrr_state.var_ranges[index].mask;

- *pdata &= (1ULL << cpuid_maxphyaddr(vcpu)) - 1;
+ *pdata &= ~kvm_vcpu_reserved_gpa_bits_raw(vcpu);
}

return 0;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 82a70511c0d3..28fea7ff7a86 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -408,7 +408,7 @@ int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
{
enum lapic_mode old_mode = kvm_get_apic_mode(vcpu);
enum lapic_mode new_mode = kvm_apic_mode(msr_info->data);
- u64 reserved_bits = ((~0ULL) << cpuid_maxphyaddr(vcpu)) | 0x2ff |
+ u64 reserved_bits = kvm_vcpu_reserved_gpa_bits_raw(vcpu) | 0x2ff |
(guest_cpuid_has(vcpu, X86_FEATURE_X2APIC) ? 0 : X2APIC_ENABLE);

if ((msr_info->data & reserved_bits) != 0 || new_mode == LAPIC_MODE_INVALID)
@@ -10089,7 +10089,7 @@ int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
fx_init(vcpu);

vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
- vcpu->arch.reserved_gpa_bits = rsvd_bits(cpuid_maxphyaddr(vcpu), 63);
+ vcpu->arch.reserved_gpa_bits = kvm_vcpu_reserved_gpa_bits_raw(vcpu);

vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT;

--
2.30.0.365.g02bc693789-goog
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