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KVM: SVM: Implement hsave

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Implement the hsave MSR, that gives the VCPU a GPA to save the
old guest state in.

v2 allows userspace to save/restore hsave
v4 dummys out the hsave MSR, so we use a host page
v6 remembers the guest's hsave and exports the MSR

Acked-by: Joerg Roedel <joro@8bytes.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf 2008-11-25 20:17:05 +01:00 committed by Avi Kivity
parent 1371d90460
commit b286d5d8b0
3 changed files with 16 additions and 1 deletions
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2
arch/x86/kvm/kvm_svm.h
View file

@ -41,6 +41,8 @@ struct vcpu_svm {
unsigned long host_dr7;
u32 *msrpm;
struct vmcb *hsave;
u64 hsave_msr;
};
#endif

13
arch/x86/kvm/svm.c
View file

@ -626,6 +626,7 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
struct vcpu_svm *svm;
struct page *page;
struct page *msrpm_pages;
struct page *hsave_page;
int err;
svm = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
@ -651,6 +652,11 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
svm->msrpm = page_address(msrpm_pages);
svm_vcpu_init_msrpm(svm->msrpm);
hsave_page = alloc_page(GFP_KERNEL);
if (!hsave_page)
goto uninit;
svm->hsave = page_address(hsave_page);
svm->vmcb = page_address(page);
clear_page(svm->vmcb);
svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT;
@ -680,6 +686,7 @@ static void svm_free_vcpu(struct kvm_vcpu *vcpu)
__free_page(pfn_to_page(svm->vmcb_pa >> PAGE_SHIFT));
__free_pages(virt_to_page(svm->msrpm), MSRPM_ALLOC_ORDER);
__free_page(virt_to_page(svm->hsave));
kvm_vcpu_uninit(vcpu);
kmem_cache_free(kvm_vcpu_cache, svm);
}
@ -1377,6 +1384,9 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data)
case MSR_IA32_LASTINTTOIP:
*data = svm->vmcb->save.last_excp_to;
break;
case MSR_VM_HSAVE_PA:
*data = svm->hsave_msr;
break;
default:
return kvm_get_msr_common(vcpu, ecx, data);
}
@ -1470,6 +1480,9 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
*/
pr_unimpl(vcpu, "unimplemented perfctr wrmsr: 0x%x data 0x%llx\n", ecx, data);
break;
case MSR_VM_HSAVE_PA:
svm->hsave_msr = data;
break;
default:
return kvm_set_msr_common(vcpu, ecx, data);

2
arch/x86/kvm/x86.c
View file

@ -456,7 +456,7 @@ static u32 msrs_to_save[] = {
MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
#endif
MSR_IA32_TIME_STAMP_COUNTER, MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
MSR_IA32_PERF_STATUS, MSR_IA32_CR_PAT
MSR_IA32_PERF_STATUS, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA
};
static unsigned num_msrs_to_save;