moonjuice/kernel_arpi
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

KVM: nSVM: Optimize vmcb12 to vmcb02 save area copies

Browse Source 
Use the vmcb12 control clean field to determine which vmcb12.save
registers were marked dirty in order to minimize register copies
when switching from L1 to L2. Those vmcb12 registers marked as dirty need
to be copied to L0's vmcb02 as they will be used to update the vmcb
state cache for the L2 VMRUN.  In the case where we have a different
vmcb12 from the last L2 VMRUN all vmcb12.save registers must be
copied over to L2.save.

Tested:
kvm-unit-tests
kvm selftests
Fedora L1 L2

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Cathy Avery <cavery@redhat.com>
Message-Id: <20210301200844.2000-1-cavery@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Cathy Avery
2021-03-01 15:08:44 -05:00
committed by Paolo Bonzini
parent d00b99c514
commit 8173396e94
3 changed files with 35 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/kvm/svm/svm.h
View File

@@ -93,6 +93,7 @@ struct svm_nested_state {
u64 hsave_msr;
u64 vm_cr_msr;
u64 vmcb12_gpa;
u64 last_vmcb12_gpa;
/* These are the merged vectors */
u32 *msrpm;
@@ -247,6 +248,11 @@ static inline void vmcb_mark_dirty(struct vmcb *vmcb, int bit)
vmcb->control.clean &= ~(1 << bit);
}
static inline bool vmcb_is_dirty(struct vmcb *vmcb, int bit)
{
return !test_bit(bit, (unsigned long *)&vmcb->control.clean);
}
static inline struct vcpu_svm *to_svm(struct kvm_vcpu *vcpu)
{
return container_of(vcpu, struct vcpu_svm, vcpu);