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Date: Tue, 5 Jan 2010 16:12:44 +0200
From: Gleb Natapov <gleb@...hat.com>
To: kvm@...r.kernel.org
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, avi@...hat.com,
mingo@...e.hu, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
hpa@...or.com, riel@...hat.com, cl@...ux-foundation.org
Subject: [PATCH v3 02/12] Add PV MSR to enable asynchronous page faults delivery.
Signed-off-by: Gleb Natapov <gleb@...hat.com>
---
arch/x86/include/asm/kvm_host.h | 3 ++
arch/x86/include/asm/kvm_para.h | 4 +++
arch/x86/kvm/x86.c | 49 +++++++++++++++++++++++++++++++++++++-
include/linux/kvm.h | 1 +
4 files changed, 55 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 741b897..01d3ec4 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -362,6 +362,9 @@ struct kvm_vcpu_arch {
/* used for guest single stepping over the given code position */
u16 singlestep_cs;
unsigned long singlestep_rip;
+
+ u32 __user *apf_data;
+ u64 apf_msr_val;
};
struct kvm_mem_alias {
diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h
index 5f580f2..f77eed3 100644
--- a/arch/x86/include/asm/kvm_para.h
+++ b/arch/x86/include/asm/kvm_para.h
@@ -15,12 +15,16 @@
#define KVM_FEATURE_CLOCKSOURCE 0
#define KVM_FEATURE_NOP_IO_DELAY 1
#define KVM_FEATURE_MMU_OP 2
+#define KVM_FEATURE_ASYNC_PF 3
#define MSR_KVM_WALL_CLOCK 0x11
#define MSR_KVM_SYSTEM_TIME 0x12
+#define MSR_KVM_ASYNC_PF_EN 0x4b564d00
#define KVM_MAX_MMU_OP_BATCH 32
+#define KVM_ASYNC_PF_ENABLED (1 << 0)
+
/* Operations for KVM_HC_MMU_OP */
#define KVM_MMU_OP_WRITE_PTE 1
#define KVM_MMU_OP_FLUSH_TLB 2
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index adc8597..f6821b9 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -620,9 +620,9 @@ static inline u32 bit(int bitno)
* kvm-specific. Those are put in the beginning of the list.
*/
-#define KVM_SAVE_MSRS_BEGIN 2
+#define KVM_SAVE_MSRS_BEGIN 3
static u32 msrs_to_save[] = {
- MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
+ MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK, MSR_KVM_ASYNC_PF_EN,
MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
MSR_K6_STAR,
#ifdef CONFIG_X86_64
@@ -1003,6 +1003,37 @@ out:
return r;
}
+static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
+{
+ u64 gpa = data & ~0x3f;
+ int offset = offset_in_page(gpa);
+ unsigned long addr;
+
+ /* Bits 1:5 are resrved, Should be zero */
+ if (data & 0x3e)
+ return 1;
+
+ vcpu->arch.apf_msr_val = data;
+
+ if (!(data & KVM_ASYNC_PF_ENABLED)) {
+ vcpu->arch.apf_data = NULL;
+ return 0;
+ }
+
+ addr = gfn_to_hva(vcpu->kvm, gpa >> PAGE_SHIFT);
+ if (kvm_is_error_hva(addr))
+ return 1;
+
+ vcpu->arch.apf_data = (u32 __user*)(addr + offset);
+
+ /* check if address is mapped */
+ if (get_user(offset, vcpu->arch.apf_data)) {
+ vcpu->arch.apf_data = NULL;
+ return 1;
+ }
+ return 0;
+}
+
int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
switch (msr) {
@@ -1083,6 +1114,10 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
kvm_request_guest_time_update(vcpu);
break;
}
+ case MSR_KVM_ASYNC_PF_EN:
+ if (kvm_pv_enable_async_pf(vcpu, data))
+ return 1;
+ break;
case MSR_IA32_MCG_CTL:
case MSR_IA32_MCG_STATUS:
case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
@@ -1275,6 +1310,9 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
case MSR_KVM_SYSTEM_TIME:
data = vcpu->arch.time;
break;
+ case MSR_KVM_ASYNC_PF_EN:
+ data = vcpu->arch.apf_msr_val;
+ break;
case MSR_IA32_P5_MC_ADDR:
case MSR_IA32_P5_MC_TYPE:
case MSR_IA32_MCG_CAP:
@@ -1397,6 +1435,7 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_XEN_HVM:
case KVM_CAP_ADJUST_CLOCK:
case KVM_CAP_VCPU_EVENTS:
+ case KVM_CAP_ASYNC_PF:
r = 1;
break;
case KVM_CAP_COALESCED_MMIO:
@@ -5117,6 +5156,9 @@ free_vcpu:
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
+ vcpu->arch.apf_data = NULL;
+ vcpu->arch.apf_msr_val = 0;
+
vcpu_load(vcpu);
kvm_mmu_unload(vcpu);
vcpu_put(vcpu);
@@ -5134,6 +5176,9 @@ int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
vcpu->arch.dr6 = DR6_FIXED_1;
vcpu->arch.dr7 = DR7_FIXED_1;
+ vcpu->arch.apf_data = NULL;
+ vcpu->arch.apf_msr_val = 0;
+
return kvm_x86_ops->vcpu_reset(vcpu);
}
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index f2feef6..85a7161 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -497,6 +497,7 @@ struct kvm_ioeventfd {
#endif
#define KVM_CAP_S390_PSW 42
#define KVM_CAP_PPC_SEGSTATE 43
+#define KVM_CAP_ASYNC_PF 44
#ifdef KVM_CAP_IRQ_ROUTING
--
1.6.5
--
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