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LoongArch: KVM: Move host CSR_EENTRY save and restore in context switch

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CSR register LOONGARCH_CSR_EENTRY is shared between host CPU and guest
vCPU, KVM need save and restore LOONGARCH_CSR_EENTRY register. Here move
LOONGARCH_CSR_EENTRY saving in to context switch function rather than VM
entry.

At most time VM enter/exit is much more frequent than vCPU thread context
switch.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao
2026-04-09 18:56:36 +08:00
committed by Huacai Chen
parent 14d2714d65
commit f62eb9ca8d
1 changed files with 4 additions and 3 deletions
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7
arch/loongarch/kvm/vcpu.c
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@@ -320,7 +320,6 @@ static int kvm_pre_enter_guest(struct kvm_vcpu *vcpu)
* and it may also clear KVM_REQ_TLB_FLUSH_GPA pending bit
*/
kvm_late_check_requests(vcpu);
vcpu->arch.host_eentry = csr_read64(LOONGARCH_CSR_EENTRY);
/* Clear KVM_LARCH_SWCSR_LATEST as CSR will change when enter guest */
vcpu->arch.aux_inuse &= ~KVM_LARCH_SWCSR_LATEST;
@@ -1628,9 +1627,11 @@ static int _kvm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
* If not, any old guest state from this vCPU will have been clobbered.
*/
context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu);
if (migrated || (context->last_vcpu != vcpu))
if (migrated || (context->last_vcpu != vcpu)) {
context->last_vcpu = vcpu;
vcpu->arch.aux_inuse &= ~KVM_LARCH_HWCSR_USABLE;
context->last_vcpu = vcpu;
vcpu->arch.host_eentry = csr_read64(LOONGARCH_CSR_EENTRY);
}
/* Restore timer state regardless */
kvm_restore_timer(vcpu);