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Commit 64d4d521 authored by Sheng Yang's avatar Sheng Yang Committed by Avi Kivity
Browse files

KVM: Enable MTRR for EPT 



The effective memory type of EPT is the mixture of MSR_IA32_CR_PAT and memory
type field of EPT entry.

Signed-off-by: default avatarSheng Yang <sheng@linux.intel.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 74be52e3

arch/x86/include/asm/kvm_host.h

+2 −1
Original line number Diff line number Diff line
@@ -483,6 +483,7 @@ struct kvm_x86_ops { 


	int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);

	int (*get_tdp_level)(void);

	int (*get_mt_mask_shift)(void);

};



extern struct kvm_x86_ops *kvm_x86_ops;
@@ -496,7 +497,7 @@ int kvm_mmu_setup(struct kvm_vcpu *vcpu); 
void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);

void kvm_mmu_set_base_ptes(u64 base_pte);

void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,

		u64 dirty_mask, u64 nx_mask, u64 x_mask);

		u64 dirty_mask, u64 nx_mask, u64 x_mask, u64 mt_mask);



int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);

void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);

arch/x86/kvm/mmu.c

+10 −1
Original line number Diff line number Diff line
@@ -168,6 +168,7 @@ static u64 __read_mostly shadow_x_mask; /* mutual exclusive with nx_mask */ 
static u64 __read_mostly shadow_user_mask;

static u64 __read_mostly shadow_accessed_mask;

static u64 __read_mostly shadow_dirty_mask;

static u64 __read_mostly shadow_mt_mask;



void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte)

{
@@ -183,13 +184,14 @@ void kvm_mmu_set_base_ptes(u64 base_pte) 
EXPORT_SYMBOL_GPL(kvm_mmu_set_base_ptes);



void kvm_mmu_set_mask_ptes(u64 user_mask, u64 accessed_mask,

		u64 dirty_mask, u64 nx_mask, u64 x_mask)

		u64 dirty_mask, u64 nx_mask, u64 x_mask, u64 mt_mask)

{

	shadow_user_mask = user_mask;

	shadow_accessed_mask = accessed_mask;

	shadow_dirty_mask = dirty_mask;

	shadow_nx_mask = nx_mask;

	shadow_x_mask = x_mask;

	shadow_mt_mask = mt_mask;

}

EXPORT_SYMBOL_GPL(kvm_mmu_set_mask_ptes);
@@ -1546,6 +1548,8 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte, 
{

	u64 spte;

	int ret = 0;

	u64 mt_mask = shadow_mt_mask;



	/*

	 * We don't set the accessed bit, since we sometimes want to see

	 * whether the guest actually used the pte (in order to detect
@@ -1564,6 +1568,11 @@ static int set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte, 
		spte |= shadow_user_mask;

	if (largepage)

		spte |= PT_PAGE_SIZE_MASK;

	if (mt_mask) {

		mt_mask = get_memory_type(vcpu, gfn) <<

			  kvm_x86_ops->get_mt_mask_shift();

		spte |= mt_mask;

	}



	spte |= (u64)pfn << PAGE_SHIFT;

arch/x86/kvm/svm.c

+6 −0
Original line number Diff line number Diff line
@@ -1912,6 +1912,11 @@ static int get_npt_level(void) 
#endif

}



static int svm_get_mt_mask_shift(void)

{

	return 0;

}



static struct kvm_x86_ops svm_x86_ops = {

	.cpu_has_kvm_support = has_svm,

	.disabled_by_bios = is_disabled,
@@ -1967,6 +1972,7 @@ static struct kvm_x86_ops svm_x86_ops = { 


	.set_tss_addr = svm_set_tss_addr,

	.get_tdp_level = get_npt_level,

	.get_mt_mask_shift = svm_get_mt_mask_shift,

};



static int __init svm_init(void)

arch/x86/kvm/vmx.c

+8 −2
Original line number Diff line number Diff line
@@ -3574,6 +3574,11 @@ static int get_ept_level(void) 
	return VMX_EPT_DEFAULT_GAW + 1;

}



static int vmx_get_mt_mask_shift(void)

{

	return VMX_EPT_MT_EPTE_SHIFT;

}



static struct kvm_x86_ops vmx_x86_ops = {

	.cpu_has_kvm_support = cpu_has_kvm_support,

	.disabled_by_bios = vmx_disabled_by_bios,
@@ -3629,6 +3634,7 @@ static struct kvm_x86_ops vmx_x86_ops = { 


	.set_tss_addr = vmx_set_tss_addr,

	.get_tdp_level = get_ept_level,

	.get_mt_mask_shift = vmx_get_mt_mask_shift,

};



static int __init vmx_init(void)
@@ -3685,10 +3691,10 @@ static int __init vmx_init(void) 
		bypass_guest_pf = 0;

		kvm_mmu_set_base_ptes(VMX_EPT_READABLE_MASK |

			VMX_EPT_WRITABLE_MASK |

			VMX_EPT_DEFAULT_MT << VMX_EPT_MT_EPTE_SHIFT |

			VMX_EPT_IGMT_BIT);

		kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull,

				VMX_EPT_EXECUTABLE_MASK);

				VMX_EPT_EXECUTABLE_MASK,

				VMX_EPT_DEFAULT_MT << VMX_EPT_MT_EPTE_SHIFT);

		kvm_enable_tdp();

	} else

		kvm_disable_tdp();

arch/x86/kvm/x86.c

+1 −1
Original line number Diff line number Diff line
@@ -2615,7 +2615,7 @@ int kvm_arch_init(void *opaque) 
	kvm_mmu_set_nonpresent_ptes(0ull, 0ull);

	kvm_mmu_set_base_ptes(PT_PRESENT_MASK);

	kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,

			PT_DIRTY_MASK, PT64_NX_MASK, 0);

			PT_DIRTY_MASK, PT64_NX_MASK, 0, 0);

	return 0;



out: