On 01/17/2010 11:03 AM, Gleb Natapov wrote:
Signed-off-by: Gleb Natapov<gleb@xxxxxxxxxx>
Signed-off-by: Vadim Rozenfeld<vrozenfe@xxxxxxxxxx>
Changelog entry.
struct kvm_mem_alias {
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index ba8c045..4b224f9 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1246,3 +1246,34 @@ int kvm_x2apic_msr_read(struct kvm_vcpu *vcpu, u32 msr, u64 *data)
return 0;
}
+
+int kvm_hv_vapic_msr_write(struct kvm_vcpu *vcpu, u32 reg, u64 data)
+{
+ struct kvm_lapic *apic = vcpu->arch.apic;
+
+ 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 reg, u64 *data)
+{
+ struct kvm_lapic *apic = vcpu->arch.apic;
+ u32 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;
+}
I prefer putting this in x86.c (maybe later split into hyperv.c).
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);
+}
Are you sure that vapic enabled is equivalent to apic assist page enable?
!! not required.
#endif
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index db0b2b1..2fe555c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -632,6 +632,7 @@ static u32 msrs_to_save[] = {
#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_APIC_ASSIST_PAGE,
};
Will be dropped by msr validation.
static unsigned num_msrs_to_save;
@@ -1063,10 +1064,37 @@ 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 vaddr;
+ void *addr;
+ struct page *page;
+ vcpu->arch.hv_vapic = data;
+ if (!kvm_hv_vapic_enabled(vcpu))
+ break;
+ vaddr = gfn_to_hva(vcpu->kvm, data>>
+ HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT);
+ if (kvm_is_error_hva(vaddr))
+ return 1;
+ page = virt_to_page(vaddr);
virt_to_page() takes a kernel address, not a user address. This is
get_user_pages(). But I think the whole thing is done better with
put_user().
+ addr = kmap_atomic(page, KM_USER0);
+ clear_user_page(addr, vaddr, page);
+ kunmap_atomic(addr, KM_USER0);
Surprising that clear_user_page needs kmap_atomic() (but true).
--
error compiling committee.c: too many arguments to function
--
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