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Subject[PATCH 05/40] KVM: SVM: Implement hsave
Date
From: Alexander Graf <agraf@suse.de>

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>
---
arch/x86/kvm/kvm_svm.h | 2 ++
arch/x86/kvm/svm.c | 13 +++++++++++++
arch/x86/kvm/x86.c | 2 +-
3 files changed, 16 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kvm/kvm_svm.h b/arch/x86/kvm/kvm_svm.h
index 8e5ee99..a0877ca 100644
--- a/arch/x86/kvm/kvm_svm.h
+++ b/arch/x86/kvm/kvm_svm.h
@@ -41,6 +41,8 @@ struct vcpu_svm {
unsigned long host_dr7;

u32 *msrpm;
+ struct vmcb *hsave;
+ u64 hsave_msr;
};

#endif
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 79cc06b..59aaff1 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -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);
}
@@ -1471,6 +1481,9 @@ 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);
}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 758b7a1..99165a9 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -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;
--
1.6.0.6


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