return mtrr_state->deftype & IA32_MTRR_DEF_TYPE_TYPE_MASK;
}
+/*
+* Three terms are used in the following code:
+* - segment, it indicates the address segments covered by fixed MTRRs.
+* - unit, it corresponds to the MSR entry in the segment.
+* - range, a range is covered in one memory cache type.
+*/
+struct fixed_mtrr_segment {
+ u64 start;
+ u64 end;
+
+ int range_shift;
+
+ /* the start position in kvm_mtrr.fixed_ranges[]. */
+ int range_start;
+};
+
+static struct fixed_mtrr_segment fixed_seg_table[] = {
+ /* MSR_MTRRfix64K_00000, 1 unit. 64K fixed mtrr. */
+ {
+ .start = 0x0,
+ .end = 0x80000,
+ .range_shift = 16, /* 64K */
+ .range_start = 0,
+ },
+
+ /*
+ * MSR_MTRRfix16K_80000 ... MSR_MTRRfix16K_A0000, 2 units,
+ * 16K fixed mtrr.
+ */
+ {
+ .start = 0x80000,
+ .end = 0xc0000,
+ .range_shift = 14, /* 16K */
+ .range_start = 8,
+ },
+
+ /*
+ * MSR_MTRRfix4K_C0000 ... MSR_MTRRfix4K_F8000, 8 units,
+ * 4K fixed mtrr.
+ */
+ {
+ .start = 0xc0000,
+ .end = 0x100000,
+ .range_shift = 12, /* 12K */
+ .range_start = 24,
+ }
+};
+
+/*
+ * The size of unit is covered in one MSR, one MSR entry contains
+ * 8 ranges so that unit size is always 8 * 2^range_shift.
+ */
+static u64 fixed_mtrr_seg_unit_size(int seg)
+{
+ return 8 << fixed_seg_table[seg].range_shift;
+}
+
+static bool fixed_msr_to_seg_unit(u32 msr, int *seg, int *unit)
+{
+ switch (msr) {
+ case MSR_MTRRfix64K_00000:
+ *seg = 0;
+ *unit = 0;
+ break;
+ case MSR_MTRRfix16K_80000 ... MSR_MTRRfix16K_A0000:
+ *seg = 1;
+ *unit = msr - MSR_MTRRfix16K_80000;
+ break;
+ case MSR_MTRRfix4K_C0000 ... MSR_MTRRfix4K_F8000:
+ *seg = 2;
+ *unit = msr - MSR_MTRRfix4K_C0000;
+ break;
+ default:
+ return false;
+ }
+
+ return true;
+}
+
+static void fixed_mtrr_seg_unit_range(int seg, int unit, u64 *start, u64 *end)
+{
+ struct fixed_mtrr_segment *mtrr_seg = &fixed_seg_table[seg];
+ u64 unit_size = fixed_mtrr_seg_unit_size(seg);
+
+ *start = mtrr_seg->start + unit * unit_size;
+ *end = *start + unit_size;
+ WARN_ON(*end > mtrr_seg->end);
+}
+
+static int fixed_mtrr_seg_unit_range_index(int seg, int unit)
+{
+ struct fixed_mtrr_segment *mtrr_seg = &fixed_seg_table[seg];
+
+ WARN_ON(mtrr_seg->start + unit * fixed_mtrr_seg_unit_size(seg)
+ > mtrr_seg->end);
+
+ /* each unit has 8 ranges. */
+ return mtrr_seg->range_start + 8 * unit;
+}
+
+static bool fixed_msr_to_range(u32 msr, u64 *start, u64 *end)
+{
+ int seg, unit;
+
+ if (!fixed_msr_to_seg_unit(msr, &seg, &unit))
+ return false;
+
+ fixed_mtrr_seg_unit_range(seg, unit, start, end);
+ return true;
+}
+
+static int fixed_msr_to_range_index(u32 msr)
+{
+ int seg, unit;
+
+ if (!fixed_msr_to_seg_unit(msr, &seg, &unit))
+ return -1;
+
+ return fixed_mtrr_seg_unit_range_index(seg, unit);
+}
+
static void update_mtrr(struct kvm_vcpu *vcpu, u32 msr)
{
struct kvm_mtrr *mtrr_state = &vcpu->arch.mtrr_state;
gfn_t start, end, mask;
int index;
- bool is_fixed = true;
if (msr == MSR_IA32_CR_PAT || !tdp_enabled ||
!kvm_arch_has_noncoherent_dma(vcpu->kvm))
if (!mtrr_is_enabled(mtrr_state) && msr != MSR_MTRRdefType)
return;
- switch (msr) {
- case MSR_MTRRfix64K_00000:
- start = 0x0;
- end = 0x80000;
- break;
- case MSR_MTRRfix16K_80000:
- start = 0x80000;
- end = 0xa0000;
- break;
- case MSR_MTRRfix16K_A0000:
- start = 0xa0000;
- end = 0xc0000;
- break;
- case MSR_MTRRfix4K_C0000 ... MSR_MTRRfix4K_F8000:
- index = msr - MSR_MTRRfix4K_C0000;
- start = 0xc0000 + index * (32 << 10);
- end = start + (32 << 10);
- break;
- case MSR_MTRRdefType:
- is_fixed = false;
+ /* fixed MTRRs. */
+ if (fixed_msr_to_range(msr, &start, &end)) {
+ if (!fixed_mtrr_is_enabled(mtrr_state))
+ return;
+ } else if (msr == MSR_MTRRdefType) {
start = 0x0;
end = ~0ULL;
- break;
- default:
+ } else {
/* variable range MTRRs. */
- is_fixed = false;
index = (msr - 0x200) / 2;
start = mtrr_state->var_ranges[index].base & PAGE_MASK;
mask = mtrr_state->var_ranges[index].mask & PAGE_MASK;
end = ((start & mask) | ~mask) + 1;
}
- if (is_fixed && !fixed_mtrr_is_enabled(mtrr_state))
- return;
-
kvm_zap_gfn_range(vcpu->kvm, gpa_to_gfn(start), gpa_to_gfn(end));
}
int kvm_mtrr_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
- u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
+ int index;
if (!kvm_mtrr_valid(vcpu, msr, data))
return 1;
- if (msr == MSR_MTRRdefType)
+ index = fixed_msr_to_range_index(msr);
+ if (index >= 0)
+ *(u64 *)&vcpu->arch.mtrr_state.fixed_ranges[index] = data;
+ else if (msr == MSR_MTRRdefType)
vcpu->arch.mtrr_state.deftype = data;
- else if (msr == MSR_MTRRfix64K_00000)
- p[0] = data;
- else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
- p[1 + msr - MSR_MTRRfix16K_80000] = data;
- else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
- p[3 + msr - MSR_MTRRfix4K_C0000] = data;
else if (msr == MSR_IA32_CR_PAT)
vcpu->arch.pat = data;
else { /* Variable MTRRs */
- int idx, is_mtrr_mask;
+ int is_mtrr_mask;
- idx = (msr - 0x200) / 2;
- is_mtrr_mask = msr - 0x200 - 2 * idx;
+ index = (msr - 0x200) / 2;
+ is_mtrr_mask = msr - 0x200 - 2 * index;
if (!is_mtrr_mask)
- vcpu->arch.mtrr_state.var_ranges[idx].base = data;
+ vcpu->arch.mtrr_state.var_ranges[index].base = data;
else
- vcpu->arch.mtrr_state.var_ranges[idx].mask = data;
+ vcpu->arch.mtrr_state.var_ranges[index].mask = data;
}
update_mtrr(vcpu, msr);
int kvm_mtrr_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
- u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
+ int index;
/* MSR_MTRRcap is a readonly MSR. */
if (msr == MSR_MTRRcap) {
if (!msr_mtrr_valid(msr))
return 1;
- if (msr == MSR_MTRRdefType)
+ index = fixed_msr_to_range_index(msr);
+ if (index >= 0)
+ *pdata = *(u64 *)&vcpu->arch.mtrr_state.fixed_ranges[index];
+ else if (msr == MSR_MTRRdefType)
*pdata = vcpu->arch.mtrr_state.deftype;
- else if (msr == MSR_MTRRfix64K_00000)
- *pdata = p[0];
- else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
- *pdata = p[1 + msr - MSR_MTRRfix16K_80000];
- else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
- *pdata = p[3 + msr - MSR_MTRRfix4K_C0000];
else if (msr == MSR_IA32_CR_PAT)
*pdata = vcpu->arch.pat;
else { /* Variable MTRRs */
- int idx, is_mtrr_mask;
+ int is_mtrr_mask;
- idx = (msr - 0x200) / 2;
- is_mtrr_mask = msr - 0x200 - 2 * idx;
+ index = (msr - 0x200) / 2;
+ is_mtrr_mask = msr - 0x200 - 2 * index;
if (!is_mtrr_mask)
- *pdata = vcpu->arch.mtrr_state.var_ranges[idx].base;
+ *pdata = vcpu->arch.mtrr_state.var_ranges[index].base;
else
- *pdata = vcpu->arch.mtrr_state.var_ranges[idx].mask;
+ *pdata = vcpu->arch.mtrr_state.var_ranges[index].mask;
}
return 0;
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