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Subject[PATCH 03/10] KVM: SVM: Move nested INTR #vmexit into preemtible code
Date
This patch makes use of the KVM_REQ_VMEXIT to move the
emulation of #vmexit(INTR) out of non-preemptible code.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kvm/svm.c | 18 ++++++++++++++++--
1 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index b6ce1a9..7015680 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -1379,8 +1379,14 @@ static inline int nested_svm_intr(struct vcpu_svm *svm)

svm->vmcb->control.exit_code = SVM_EXIT_INTR;

- if (nested_svm_exit_handled(svm)) {
- nsvm_printk("VMexit -> INTR\n");
+ if (svm->nested.intercept & 1ULL) {
+ /*
+ * The #vmexit can't be emulated here directly because this
+ * code path runs with irqs and preemtion disabled and a
+ * #vmexit emulation might sleep. Only set the request bit for
+ * the #vmexit here.
+ */
+ set_bit(KVM_REQ_VMEXIT, &svm->vcpu.requests);
return 1;
}

@@ -2859,6 +2865,13 @@ static bool svm_gb_page_enable(void)
return true;
}

+static void svm_emulate_vmexit(struct kvm_vcpu *vcpu)
+{
+ struct vcpu_svm *svm = to_svm(vcpu);
+
+ nested_svm_vmexit(svm);
+}
+
static struct kvm_x86_ops svm_x86_ops = {
.cpu_has_kvm_support = has_svm,
.disabled_by_bios = is_disabled,
@@ -2923,6 +2936,7 @@ static struct kvm_x86_ops svm_x86_ops = {

.exit_reasons_str = svm_exit_reasons_str,
.gb_page_enable = svm_gb_page_enable,
+ .emulate_vmexit = svm_emulate_vmexit,
};

static int __init svm_init(void)
--
1.6.4.3



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