Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
Signed-off-by: Vadim Rozenfeld <vrozenfe@xxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 2 +
arch/x86/kvm/lapic.c | 53 +++++++++++++++++++++++++++++++++++++++
arch/x86/kvm/lapic.h | 8 ++++++
arch/x86/kvm/x86.c | 34 ++++++++++++++++++++++---
include/linux/kvm.h | 1 +
5 files changed, 94 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 7bfd468..4d82c52 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -362,6 +362,8 @@ struct kvm_vcpu_arch {
/* used for guest single stepping over the given code position */
u16 singlestep_cs;
unsigned long singlestep_rip;
+ /* fields used by HYPER-V emulation */
+ u64 hv_vapic;
};
struct kvm_mem_alias {
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index ba8c045..063963f 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1246,3 +1246,56 @@ int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
return 0;
}
+
+static u32 kvm_hv_vapic_msr2reg(u32 msr)
+{
+ u32 reg;
+ switch (msr) {
+ case HV_X64_MSR_EOI:
+ reg = APIC_EOI;
+ break;
+ case HV_X64_MSR_ICR:
+ reg = APIC_ICR;
+ break;
+ case HV_X64_MSR_TPR:
+ reg = APIC_TASKPRI;
+ break;
+ default:
+ reg = -1;
+ break;
+ }
+
+ return reg;
+}
+
+int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data)
+{
+ struct kvm_lapic *apic = vcpu->arch.apic;
+ u32 reg = kvm_hv_vapic_msr2reg(msr);
+
+ if (!irqchip_in_kernel(vcpu->kvm))
+ return 1;
+
+ /* if this is ICR write vector before command */
+ if (reg == APIC_ICR)
+ apic_reg_write(apic, APIC_ICR2, (u32)(data >> 32));
+ return apic_reg_write(apic, reg, (u32)data);
+}
+
+int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
+{
+ struct kvm_lapic *apic = vcpu->arch.apic;
+ u32 reg = kvm_hv_vapic_msr2reg(msr), low, high = 0;
+
+ if (!irqchip_in_kernel(vcpu->kvm))
+ return 1;
+
+ if (apic_reg_read(apic, reg, 4, &low))
+ return 1;
+ if (reg == APIC_ICR)
+ apic_reg_read(apic, APIC_ICR2, 4, &high);
+
+ *data = (((u64)high) << 32) | low;
+
+ return 0;
+}
diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
index 40010b0..d081cb6 100644
--- a/arch/x86/kvm/lapic.h
+++ b/arch/x86/kvm/lapic.h
@@ -48,4 +48,12 @@ void kvm_lapic_sync_to_vapic(struct kvm_vcpu *vcpu);
int kvm_x2apic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data);
int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
+
+int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 msr, u64 data);
+int kvm_hv_vapic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data);
+
+static inline bool kvm_hv_vapic_enabled(struct kvm_vcpu *vcpu)
+{
+ return !!(vcpu->arch.hv_vapic & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE);
+}
#endif
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 6972b2b..e058898 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -629,7 +629,8 @@ static u32 msrs_to_save[] = {
MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
#endif
MSR_IA32_TSC, MSR_IA32_PERF_STATUS, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA,
- HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL
+ HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
+ HV_X64_MSR_APIC_ASSIST_PAGE
};
static unsigned num_msrs_to_save;
@@ -1061,10 +1062,30 @@ static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data)
static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
- pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x data 0x%llx\n",
- msr, data);
+ switch (msr) {
+ case HV_X64_MSR_APIC_ASSIST_PAGE: {
+ unsigned long addr;
+ vcpu->arch.hv_vapic = data;
+ if(!kvm_hv_vapic_enabled(vcpu))
+ break;
+ addr = gfn_to_hva(vcpu->kvm, data >>
+ HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT);
+ if (kvm_is_error_hva(addr))
+ return 1;
+ memset((void*)addr, 0, PAGE_SIZE);
+ break;
+ }
+ case HV_X64_MSR_EOI:
+ case HV_X64_MSR_ICR:
+ case HV_X64_MSR_TPR:
+ return kvm_hv_vapic_msr_write(vcpu, msr, data);
+ default:
+ pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
+ "data 0x%llx\n", msr, data);
+ return 1;
+ }
- return 1;
+ return 0;
}
int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
@@ -1324,6 +1345,10 @@ static int get_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
data = r;
break;
}
+ case HV_X64_MSR_EOI:
+ case HV_X64_MSR_ICR:
+ case HV_X64_MSR_TPR:
+ return kvm_hv_vapic_msr_read(vcpu, msr, pdata);
default:
pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
return 1;
@@ -1524,6 +1549,7 @@ int kvm_dev_ioctl_check_extension(long ext)
case KVM_CAP_ADJUST_CLOCK:
case KVM_CAP_VCPU_EVENTS:
case KVM_CAP_HYPERV:
+ case KVM_CAP_HYPERV_VAPIC:
r = 1;
break;
case KVM_CAP_COALESCED_MMIO:
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index e227cba..5ce6173 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -498,6 +498,7 @@ struct kvm_ioeventfd {
#define KVM_CAP_S390_PSW 42
#define KVM_CAP_PPC_SEGSTATE 43
#define KVM_CAP_HYPERV 44
+#define KVM_CAP_HYPERV_VAPIC 45
#ifdef KVM_CAP_IRQ_ROUTING
--
1.6.5
--
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