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Date: Fri, 15 May 2020 13:41:41 -0400
From: Paolo Bonzini <pbonzini@...hat.com>
To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: Cathy Avery <cavery@...hat.com>,
Liran Alon <liran.alon@...cle.com>,
Jim Mattson <jmattson@...gle.com>
Subject: [PATCH 4/7] KVM: SVM: save all control fields in svm->nested
In preparation for nested SVM save/restore, store all data that matters
from the VMCB control area into svm->nested. It will then become part
of the nested SVM state that is saved by KVM_SET_NESTED_STATE and
restored by KVM_GET_NESTED_STATE, just like the cached vmcs12 for nVMX.
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
arch/x86/kvm/svm/nested.c | 37 ++++++++++++++++++++++---------------
arch/x86/kvm/svm/svm.c | 6 ++++++
arch/x86/kvm/svm/svm.h | 22 ++++++++++++++++------
3 files changed, 44 insertions(+), 21 deletions(-)
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index 7807f6cc01fc..54be341322d8 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -237,7 +237,16 @@ static void load_nested_vmcb_control(struct vcpu_svm *svm, struct vmcb *nested_v
svm->nested.vmcb_msrpm = nested_vmcb->control.msrpm_base_pa & ~0x0fffULL;
svm->nested.vmcb_iopm = nested_vmcb->control.iopm_base_pa & ~0x0fffULL;
- /* cache intercepts */
+ svm->nested.nested_ctl = nested_vmcb->control.nested_ctl;
+ svm->nested.int_ctl = nested_vmcb->control.int_ctl;
+ svm->nested.virt_ext = nested_vmcb->control.virt_ext;
+ svm->nested.int_vector = nested_vmcb->control.int_vector;
+ svm->nested.int_state = nested_vmcb->control.int_state;
+ svm->nested.event_inj = nested_vmcb->control.event_inj;
+ svm->nested.event_inj_err = nested_vmcb->control.event_inj_err;
+ svm->nested.pause_filter_count = nested_vmcb->control.pause_filter_count;
+ svm->nested.pause_filter_thresh = nested_vmcb->control.pause_filter_thresh;
+
svm->nested.intercept_cr = nested_vmcb->control.intercept_cr;
svm->nested.intercept_dr = nested_vmcb->control.intercept_dr;
svm->nested.intercept_exceptions = nested_vmcb->control.intercept_exceptions;
@@ -279,33 +288,31 @@ static void load_nested_vmcb_save(struct vcpu_svm *svm, struct vmcb *nested_vmcb
svm->vmcb->save.cpl = nested_vmcb->save.cpl;
}
-static void nested_prepare_vmcb_control(struct vcpu_svm *svm, struct vmcb *nested_vmcb)
+static void nested_prepare_vmcb_control(struct vcpu_svm *svm)
{
- if (nested_vmcb->control.nested_ctl & SVM_NESTED_CTL_NP_ENABLE)
+ if (svm->nested.nested_ctl & SVM_NESTED_CTL_NP_ENABLE)
nested_svm_init_mmu_context(&svm->vcpu);
/* Guest paging mode is active - reset mmu */
kvm_mmu_reset_context(&svm->vcpu);
svm_flush_tlb(&svm->vcpu);
- if (nested_vmcb->control.int_ctl & V_INTR_MASKING_MASK)
+ if (svm->nested.int_ctl & V_INTR_MASKING_MASK)
svm->vcpu.arch.hflags |= HF_VINTR_MASK;
else
svm->vcpu.arch.hflags &= ~HF_VINTR_MASK;
svm->vmcb->control.tsc_offset = svm->vcpu.arch.tsc_offset;
- svm->vmcb->control.int_ctl = nested_vmcb->control.int_ctl | V_INTR_MASKING_MASK;
- svm->vmcb->control.virt_ext = nested_vmcb->control.virt_ext;
- svm->vmcb->control.int_vector = nested_vmcb->control.int_vector;
- svm->vmcb->control.int_state = nested_vmcb->control.int_state;
- svm->vmcb->control.event_inj = nested_vmcb->control.event_inj;
- svm->vmcb->control.event_inj_err = nested_vmcb->control.event_inj_err;
+ svm->vmcb->control.int_ctl = svm->nested.int_ctl | V_INTR_MASKING_MASK;
+ svm->vmcb->control.virt_ext = svm->nested.virt_ext;
+ svm->vmcb->control.int_vector = svm->nested.int_vector;
+ svm->vmcb->control.int_state = svm->nested.int_state;
+ svm->vmcb->control.event_inj = svm->nested.event_inj;
+ svm->vmcb->control.event_inj_err = svm->nested.event_inj_err;
- svm->vmcb->control.pause_filter_count =
- nested_vmcb->control.pause_filter_count;
- svm->vmcb->control.pause_filter_thresh =
- nested_vmcb->control.pause_filter_thresh;
+ svm->vmcb->control.pause_filter_count = svm->nested.pause_filter_count;
+ svm->vmcb->control.pause_filter_thresh = svm->nested.pause_filter_thresh;
/* Enter Guest-Mode */
enter_guest_mode(&svm->vcpu);
@@ -329,7 +336,7 @@ void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
svm->nested.vmcb = vmcb_gpa;
load_nested_vmcb_control(svm, nested_vmcb);
load_nested_vmcb_save(svm, nested_vmcb);
- nested_prepare_vmcb_control(svm, nested_vmcb);
+ nested_prepare_vmcb_control(svm);
/*
* If L1 had a pending IRQ/NMI before executing VMRUN,
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index dc12a03d16f6..2b63d15328ba 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3343,6 +3343,12 @@ static fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
if (unlikely(svm->nested.exit_required))
return EXIT_FASTPATH_NONE;
+ if (unlikely(svm->nested.nested_run_pending)) {
+ /* After this vmentry, these fields will be used up. */
+ svm->nested.event_inj = 0;
+ svm->nested.event_inj_err = 0;
+ }
+
/*
* Disable singlestep if we're injecting an interrupt/exception.
* We don't want our modified rflags to be pushed on the stack where
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 730eb7242930..5cabed9c733a 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -90,10 +90,6 @@ struct nested_state {
/* These are the merged vectors */
u32 *msrpm;
- /* gpa pointers to the real vectors */
- u64 vmcb_msrpm;
- u64 vmcb_iopm;
-
/* A VMEXIT is required but not yet emulated */
bool exit_required;
@@ -101,13 +97,27 @@ struct nested_state {
* we cannot inject a nested vmexit yet. */
bool nested_run_pending;
- /* cache for intercepts of the guest */
+ /* cache for control fields of the guest */
+ u64 vmcb_msrpm;
+ u64 vmcb_iopm;
+
u32 intercept_cr;
u32 intercept_dr;
u32 intercept_exceptions;
u64 intercept;
- /* Nested Paging related state */
+ u32 event_inj;
+ u32 event_inj_err;
+
+ u64 virt_ext;
+ u32 int_ctl;
+ u32 int_vector;
+ u32 int_state;
+
+ u16 pause_filter_thresh;
+ u16 pause_filter_count;
+
+ u64 nested_ctl;
u64 nested_cr3;
};
--
2.18.2
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