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KVM: MMU: hypercall based pte updates and TLB flushes

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Hypercall based pte updates are faster than faults, and also allow use
of the lazy MMU mode to batch operations.

Don't report the feature if two dimensional paging is enabled.

[avi:
 - one mmu_op hypercall instead of one per op
 - allow 64-bit gpa on hypercall
 - don't pass host errors (-ENOMEM) to guest]

[akpm: warning fix on i386]

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Marcelo Tosatti
2008-02-22 12:21:37 -05:00
committed by Avi Kivity
parent 9f81128591
commit 2f333bcb4e
6 changed files with 190 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
include/asm-x86/kvm_host.h
View File

@@ -434,6 +434,10 @@ int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3);
int __emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
const void *val, int bytes);
int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
gpa_t addr, unsigned long *ret);
extern bool tdp_enabled;
enum emulation_result {
EMULATE_DONE, /* no further processing */

29
include/asm-x86/kvm_para.h
View File

@@ -12,10 +12,39 @@
#define KVM_CPUID_FEATURES 0x40000001
#define KVM_FEATURE_CLOCKSOURCE 0
#define KVM_FEATURE_NOP_IO_DELAY 1
#define KVM_FEATURE_MMU_OP 2
#define MSR_KVM_WALL_CLOCK 0x11
#define MSR_KVM_SYSTEM_TIME 0x12
#define KVM_MAX_MMU_OP_BATCH 32
/* Operations for KVM_HC_MMU_OP */
#define KVM_MMU_OP_WRITE_PTE 1
#define KVM_MMU_OP_FLUSH_TLB 2
#define KVM_MMU_OP_RELEASE_PT 3
/* Payload for KVM_HC_MMU_OP */
struct kvm_mmu_op_header {
__u32 op;
__u32 pad;
};
struct kvm_mmu_op_write_pte {
struct kvm_mmu_op_header header;
__u64 pte_phys;
__u64 pte_val;
};
struct kvm_mmu_op_flush_tlb {
struct kvm_mmu_op_header header;
};
struct kvm_mmu_op_release_pt {
struct kvm_mmu_op_header header;
__u64 pt_phys;
};
#ifdef __KERNEL__
#include <asm/processor.h>

1
include/linux/kvm.h
View File

@@ -238,6 +238,7 @@ struct kvm_vapic_addr {
#define KVM_CAP_NR_MEMSLOTS 10 /* returns max memory slots per vm */
#define KVM_CAP_PIT 11
#define KVM_CAP_NOP_IO_DELAY 12
#define KVM_CAP_PV_MMU 13
/*
* ioctls for VM fds

5
include/linux/kvm_para.h
View File

@@ -11,8 +11,11 @@
/* Return values for hypercalls */
#define KVM_ENOSYS 1000
#define KVM_EFAULT EFAULT
#define KVM_E2BIG E2BIG
#define KVM_HC_VAPIC_POLL_IRQ 1
#define KVM_HC_VAPIC_POLL_IRQ 1
#define KVM_HC_MMU_OP 2
/*
* hypercalls use architecture specific