From: Sean Christopherson <sean.j.christopherson@intel.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2 3/3] KVM: x86: Move #PF retry tracking variables into emulation context
Date: Tue, 18 Feb 2020 15:03:10 -0800 [thread overview]
Message-ID: <20200218230310.29410-4-sean.j.christopherson@intel.com> (raw)
In-Reply-To: <20200218230310.29410-1-sean.j.christopherson@intel.com>
Move last_retry_eip and last_retry_addr into the emulation context as
they are specific to retrying an instruction after emulation failure.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/include/asm/kvm_emulate.h | 4 ++++
arch/x86/include/asm/kvm_host.h | 3 ---
arch/x86/kvm/x86.c | 11 ++++++-----
3 files changed, 10 insertions(+), 8 deletions(-)
diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index a4ef19a6e612..a26c8de414e8 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -315,6 +315,10 @@ struct x86_emulate_ctxt {
bool gpa_available;
gpa_t gpa_val;
+ /* Track EIP and CR2/GPA when retrying faulting instruction on #PF. */
+ unsigned long last_retry_eip;
+ unsigned long last_retry_addr;
+
/*
* decode cache
*/
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 9c79c41eb5f6..6312ea32bb41 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -752,9 +752,6 @@ struct kvm_vcpu_arch {
cpumask_var_t wbinvd_dirty_mask;
- unsigned long last_retry_eip;
- unsigned long last_retry_addr;
-
struct {
bool halted;
gfn_t gfns[roundup_pow_of_two(ASYNC_PF_PER_VCPU)];
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f88b72932c35..d19eb776f297 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6407,6 +6407,7 @@ static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
+ /* last_retry_{eip,addr} are persistent and must not be init'd here. */
ctxt->gpa_available = false;
ctxt->eflags = kvm_get_rflags(vcpu);
ctxt->tf = (ctxt->eflags & X86_EFLAGS_TF) != 0;
@@ -6557,8 +6558,8 @@ static bool retry_instruction(struct x86_emulate_ctxt *ctxt,
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
unsigned long last_retry_eip, last_retry_addr, gpa = cr2_or_gpa;
- last_retry_eip = vcpu->arch.last_retry_eip;
- last_retry_addr = vcpu->arch.last_retry_addr;
+ last_retry_eip = ctxt->last_retry_eip;
+ last_retry_addr = ctxt->last_retry_addr;
/*
* If the emulation is caused by #PF and it is non-page_table
@@ -6573,7 +6574,7 @@ static bool retry_instruction(struct x86_emulate_ctxt *ctxt,
* and the address again, we can break out of the potential infinite
* loop.
*/
- vcpu->arch.last_retry_eip = vcpu->arch.last_retry_addr = 0;
+ ctxt->last_retry_eip = ctxt->last_retry_addr = 0;
if (!(emulation_type & EMULTYPE_ALLOW_RETRY_PF))
return false;
@@ -6588,8 +6589,8 @@ static bool retry_instruction(struct x86_emulate_ctxt *ctxt,
if (ctxt->eip == last_retry_eip && last_retry_addr == cr2_or_gpa)
return false;
- vcpu->arch.last_retry_eip = ctxt->eip;
- vcpu->arch.last_retry_addr = cr2_or_gpa;
+ ctxt->last_retry_eip = ctxt->eip;
+ ctxt->last_retry_addr = cr2_or_gpa;
if (!vcpu->arch.mmu->direct_map)
gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2_or_gpa, NULL);
--
2.24.1
next prev parent reply other threads:[~2020-02-18 23:03 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-18 23:03 [PATCH v2 0/3] KVM: x86: Minor emulator cleanup Sean Christopherson
2020-02-18 23:03 ` [PATCH v2 1/3] KVM: x86: Add EMULTYPE_PF when emulation is triggered by a page fault Sean Christopherson
2020-02-19 9:01 ` Xiaoyao Li
2020-02-20 20:11 ` Sean Christopherson
2020-02-21 2:59 ` Xiaoyao Li
2020-02-21 17:12 ` Paolo Bonzini
2020-02-18 23:03 ` [PATCH v2 2/3] KVM: x86: Move gpa_val and gpa_available into the emulator context Sean Christopherson
2020-02-18 23:03 ` Sean Christopherson [this message]
2020-02-19 8:13 ` [PATCH v2 3/3] KVM: x86: Move #PF retry tracking variables into emulation context Paolo Bonzini
2020-02-19 15:16 ` Sean Christopherson
2020-02-21 17:14 ` Paolo Bonzini
2020-02-21 18:28 ` Sean Christopherson
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