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Subject[PATCH 06/15] KVM: MTRR: do not split 64 bits MSR content
Date
Variable MTRR MSRs are 64 bits which are directly accessed with full length,
no reason to split them to two 32 bits

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
---
arch/x86/include/asm/kvm_host.h | 7 ++++++-
arch/x86/kvm/mtrr.c | 32 ++++++++++----------------------
2 files changed, 16 insertions(+), 23 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 95ce2ff..f3fc152 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -344,8 +344,13 @@ enum {
KVM_DEBUGREG_RELOAD = 4,
};

+struct kvm_mtrr_range {
+ u64 base;
+ u64 mask;
+};
+
struct kvm_mtrr {
- struct mtrr_var_range var_ranges[KVM_NR_VAR_MTRR];
+ struct kvm_mtrr_range var_ranges[KVM_NR_VAR_MTRR];
mtrr_type fixed_ranges[KVM_NR_FIXED_MTRR_REGION];

union {
diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c
index 6de49dd..bc9c6da 100644
--- a/arch/x86/kvm/mtrr.c
+++ b/arch/x86/kvm/mtrr.c
@@ -143,10 +143,8 @@ static void update_mtrr(struct kvm_vcpu *vcpu, u32 msr)
/* variable range MTRRs. */
is_fixed = false;
index = (msr - 0x200) / 2;
- start = (((u64)mtrr_state->var_ranges[index].base_hi) << 32) +
- (mtrr_state->var_ranges[index].base_lo & PAGE_MASK);
- mask = (((u64)mtrr_state->var_ranges[index].mask_hi) << 32) +
- (mtrr_state->var_ranges[index].mask_lo & PAGE_MASK);
+ start = mtrr_state->var_ranges[index].base & PAGE_MASK;
+ mask = mtrr_state->var_ranges[index].mask & PAGE_MASK;
mask |= ~0ULL << cpuid_maxphyaddr(vcpu);

end = ((start & mask) | ~mask) + 1;
@@ -177,17 +175,13 @@ int kvm_mtrr_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
vcpu->arch.pat = data;
else { /* Variable MTRRs */
int idx, is_mtrr_mask;
- u64 *pt;

idx = (msr - 0x200) / 2;
is_mtrr_mask = msr - 0x200 - 2 * idx;
if (!is_mtrr_mask)
- pt =
- (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
+ vcpu->arch.mtrr_state.var_ranges[idx].base = data;
else
- pt =
- (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
- *pt = data;
+ vcpu->arch.mtrr_state.var_ranges[idx].mask = data;
}

update_mtrr(vcpu, msr);
@@ -225,17 +219,13 @@ int kvm_mtrr_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
*pdata = vcpu->arch.pat;
else { /* Variable MTRRs */
int idx, is_mtrr_mask;
- u64 *pt;

idx = (msr - 0x200) / 2;
is_mtrr_mask = msr - 0x200 - 2 * idx;
if (!is_mtrr_mask)
- pt =
- (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
+ *pdata = vcpu->arch.mtrr_state.var_ranges[idx].base;
else
- pt =
- (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
- *pdata = *pt;
+ *pdata = vcpu->arch.mtrr_state.var_ranges[idx].mask;
}

return 0;
@@ -287,13 +277,11 @@ static int get_mtrr_type(struct kvm_mtrr *mtrr_state,
for (i = 0; i < num_var_ranges; ++i) {
unsigned short start_state, end_state;

- if (!(mtrr_state->var_ranges[i].mask_lo & (1 << 11)))
+ if (!(mtrr_state->var_ranges[i].mask & (1 << 11)))
continue;

- base = (((u64)mtrr_state->var_ranges[i].base_hi) << 32) +
- (mtrr_state->var_ranges[i].base_lo & PAGE_MASK);
- mask = (((u64)mtrr_state->var_ranges[i].mask_hi) << 32) +
- (mtrr_state->var_ranges[i].mask_lo & PAGE_MASK);
+ base = mtrr_state->var_ranges[i].base & PAGE_MASK;
+ mask = mtrr_state->var_ranges[i].mask & PAGE_MASK;

start_state = ((start & mask) == (base & mask));
end_state = ((end & mask) == (base & mask));
@@ -303,7 +291,7 @@ static int get_mtrr_type(struct kvm_mtrr *mtrr_state,
if ((start & mask) != (base & mask))
continue;

- curr_match = mtrr_state->var_ranges[i].base_lo & 0xff;
+ curr_match = mtrr_state->var_ranges[i].base & 0xff;
if (prev_match == 0xFF) {
prev_match = curr_match;
continue;
--
2.1.0


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