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author | Xiao Guangrong <guangrong.xiao@linux.intel.com> | 2015-06-15 16:55:27 +0800 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-06-19 17:16:27 +0200 |
commit | 86fd52701cfae760711fb02a03c1ab8c80ea72f3 (patch) | |
tree | 047bb01476d773dc1b7fb992754898ca9bf5c63f /arch/x86/kvm/mtrr.c | |
parent | 10fac2dc2b3b549d371d67f57193362b6bcc6dfd (diff) | |
download | linux-stable-86fd52701cfae760711fb02a03c1ab8c80ea72f3.tar.gz linux-stable-86fd52701cfae760711fb02a03c1ab8c80ea72f3.tar.bz2 linux-stable-86fd52701cfae760711fb02a03c1ab8c80ea72f3.zip |
KVM: MTRR: do not split 64 bits MSR content
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>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mtrr.c')
-rw-r--r-- | arch/x86/kvm/mtrr.c | 32 |
1 files changed, 10 insertions, 22 deletions
diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c index 191de6435f23..c4b80a46a530 100644 --- a/arch/x86/kvm/mtrr.c +++ b/arch/x86/kvm/mtrr.c @@ -161,10 +161,8 @@ 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; @@ -195,17 +193,13 @@ 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); @@ -243,17 +237,13 @@ 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; @@ -305,13 +295,11 @@ 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)); @@ -321,7 +309,7 @@ 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; |