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KVM: MTRR support 

Add emulation for the memory type range registers, needed by VMware esx 3.5,
and by pci device assignment.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2008-05-26 20:06:35 +03:00
parent 81609e3e26
commit 9ba075a664
2 changed files with 51 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
arch/x86/kvm/x86.c
View File

@ -611,6 +611,38 @@ static void kvm_write_guest_time(struct kvm_vcpu *v)
mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
}
static bool msr_mtrr_valid(unsigned msr)
{
switch (msr) {
case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
case MSR_MTRRfix64K_00000:
case MSR_MTRRfix16K_80000:
case MSR_MTRRfix16K_A0000:
case MSR_MTRRfix4K_C0000:
case MSR_MTRRfix4K_C8000:
case MSR_MTRRfix4K_D0000:
case MSR_MTRRfix4K_D8000:
case MSR_MTRRfix4K_E0000:
case MSR_MTRRfix4K_E8000:
case MSR_MTRRfix4K_F0000:
case MSR_MTRRfix4K_F8000:
case MSR_MTRRdefType:
case MSR_IA32_CR_PAT:
return true;
case 0x2f8:
return true;
}
return false;
}
static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
if (!msr_mtrr_valid(msr))
return 1;
vcpu->arch.mtrr[msr - 0x200] = data;
return 0;
}
int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
@ -632,8 +664,9 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
break;
case MSR_IA32_UCODE_REV:
case MSR_IA32_UCODE_WRITE:
case 0x200 ... 0x2ff: /* MTRRs */
break;
case 0x200 ... 0x2ff:
return set_msr_mtrr(vcpu, msr, data);
case MSR_IA32_APICBASE:
kvm_set_apic_base(vcpu, data);
break;
@ -691,6 +724,15 @@ int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
}
static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
if (!msr_mtrr_valid(msr))
return 1;
*pdata = vcpu->arch.mtrr[msr - 0x200];
return 0;
}
int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
u64 data;
@ -712,11 +754,13 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
case MSR_IA32_MC0_MISC+16:
case MSR_IA32_UCODE_REV:
case MSR_IA32_EBL_CR_POWERON:
/* MTRR registers */
case 0xfe:
case 0x200 ... 0x2ff:
data = 0;
break;
case MSR_MTRRcap:
data = 0x500 | KVM_NR_VAR_MTRR;
break;
case 0x200 ... 0x2ff:
return get_msr_mtrr(vcpu, msr, pdata);
case 0xcd: /* fsb frequency */
data = 3;
break;

3
include/asm-x86/kvm_host.h
View File

@ -79,6 +79,7 @@
#define KVM_MIN_FREE_MMU_PAGES 5
#define KVM_REFILL_PAGES 25
#define KVM_MAX_CPUID_ENTRIES 40
#define KVM_NR_VAR_MTRR 8
extern spinlock_t kvm_lock;
extern struct list_head vm_list;
@ -290,6 +291,8 @@ struct kvm_vcpu_arch {
struct page *time_page;
bool nmi_pending;
u64 mtrr[0x100];
};
struct kvm_mem_alias {