Commit 9ba075a6 authored by Avi Kivity's avatar Avi Kivity
Browse files

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: default avatarAvi Kivity <avi@qumranet.com>
parent 81609e3e

arch/x86/kvm/x86.c

+48 −4
Original line number Diff line number Diff line
@@ -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;

include/asm-x86/kvm_host.h

+3 −0
Original line number Diff line number Diff line
@@ -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 {