[PATCH v2 05/11] KVM: x86: emulator: stop using raw host flags
From: Maxim Levitsky
Date: Tue Nov 29 2022 - 14:41:40 EST
Instead of re-defining the H_FLAGS bits, just expose the 'in_smm'
and the 'in_guest_mode' host flags using emulator callbacks.
Also while at it, garbage collect the recently removed host flags.
No functional change is intended.
Signed-off-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 6 +++---
arch/x86/kvm/emulate.c | 11 +++++------
arch/x86/kvm/kvm_emulate.h | 7 ++-----
arch/x86/kvm/smm.c | 2 --
arch/x86/kvm/x86.c | 14 +++++++++-----
5 files changed, 19 insertions(+), 21 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 9208ad7a6bd004..684a5519812fb2 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -2052,11 +2052,11 @@ enum {
TASK_SWITCH_GATE = 3,
};
-#define HF_GUEST_MASK (1 << 5) /* VCPU is in guest-mode */
+#define HF_GUEST_MASK (1 << 0) /* VCPU is in guest-mode */
#ifdef CONFIG_KVM_SMM
-#define HF_SMM_MASK (1 << 6)
-#define HF_SMM_INSIDE_NMI_MASK (1 << 7)
+#define HF_SMM_MASK (1 << 1)
+#define HF_SMM_INSIDE_NMI_MASK (1 << 2)
# define __KVM_VCPU_MULTIPLE_ADDRESS_SPACE
# define KVM_ADDRESS_SPACE_NUM 2
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 5cc3efa0e21c17..d869131f84ffb3 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2309,7 +2309,7 @@ static int em_lseg(struct x86_emulate_ctxt *ctxt)
static int em_rsm(struct x86_emulate_ctxt *ctxt)
{
- if ((ctxt->ops->get_hflags(ctxt) & X86EMUL_SMM_MASK) == 0)
+ if (!ctxt->ops->in_smm(ctxt))
return emulate_ud(ctxt);
if (ctxt->ops->leave_smm(ctxt))
@@ -5132,7 +5132,7 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
const struct x86_emulate_ops *ops = ctxt->ops;
int rc = X86EMUL_CONTINUE;
int saved_dst_type = ctxt->dst.type;
- unsigned emul_flags;
+ bool in_guest_mode = ctxt->ops->in_guest_mode(ctxt);
ctxt->mem_read.pos = 0;
@@ -5147,7 +5147,6 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
goto done;
}
- emul_flags = ctxt->ops->get_hflags(ctxt);
if (unlikely(ctxt->d &
(No64|Undefined|Sse|Mmx|Intercept|CheckPerm|Priv|Prot|String))) {
if ((ctxt->mode == X86EMUL_MODE_PROT64 && (ctxt->d & No64)) ||
@@ -5181,7 +5180,7 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
fetch_possible_mmx_operand(&ctxt->dst);
}
- if (unlikely(emul_flags & X86EMUL_GUEST_MASK) && ctxt->intercept) {
+ if (unlikely(in_guest_mode) && ctxt->intercept) {
rc = emulator_check_intercept(ctxt, ctxt->intercept,
X86_ICPT_PRE_EXCEPT);
if (rc != X86EMUL_CONTINUE)
@@ -5210,7 +5209,7 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
goto done;
}
- if (unlikely(emul_flags & X86EMUL_GUEST_MASK) && (ctxt->d & Intercept)) {
+ if (unlikely(in_guest_mode) && (ctxt->d & Intercept)) {
rc = emulator_check_intercept(ctxt, ctxt->intercept,
X86_ICPT_POST_EXCEPT);
if (rc != X86EMUL_CONTINUE)
@@ -5264,7 +5263,7 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
special_insn:
- if (unlikely(emul_flags & X86EMUL_GUEST_MASK) && (ctxt->d & Intercept)) {
+ if (unlikely(in_guest_mode) && (ctxt->d & Intercept)) {
rc = emulator_check_intercept(ctxt, ctxt->intercept,
X86_ICPT_POST_MEMACCESS);
if (rc != X86EMUL_CONTINUE)
diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
index 2d9662be833378..dd0203fbb27543 100644
--- a/arch/x86/kvm/kvm_emulate.h
+++ b/arch/x86/kvm/kvm_emulate.h
@@ -220,7 +220,8 @@ struct x86_emulate_ops {
void (*set_nmi_mask)(struct x86_emulate_ctxt *ctxt, bool masked);
- unsigned (*get_hflags)(struct x86_emulate_ctxt *ctxt);
+ bool (*in_smm)(struct x86_emulate_ctxt *ctxt);
+ bool (*in_guest_mode)(struct x86_emulate_ctxt *ctxt);
int (*leave_smm)(struct x86_emulate_ctxt *ctxt);
void (*triple_fault)(struct x86_emulate_ctxt *ctxt);
int (*set_xcr)(struct x86_emulate_ctxt *ctxt, u32 index, u64 xcr);
@@ -275,10 +276,6 @@ enum x86emul_mode {
X86EMUL_MODE_PROT64, /* 64-bit (long) mode. */
};
-/* These match some of the HF_* flags defined in kvm_host.h */
-#define X86EMUL_GUEST_MASK (1 << 5) /* VCPU is in guest-mode */
-#define X86EMUL_SMM_MASK (1 << 6)
-
/*
* fastop functions are declared as taking a never-defined fastop parameter,
* so they can't be called from C directly.
diff --git a/arch/x86/kvm/smm.c b/arch/x86/kvm/smm.c
index a9c1c2af8d94c2..a3a94edd2f0bc9 100644
--- a/arch/x86/kvm/smm.c
+++ b/arch/x86/kvm/smm.c
@@ -110,8 +110,6 @@ static void check_smram_offsets(void)
void kvm_smm_changed(struct kvm_vcpu *vcpu, bool entering_smm)
{
- BUILD_BUG_ON(HF_SMM_MASK != X86EMUL_SMM_MASK);
-
trace_kvm_smm_transition(vcpu->vcpu_id, vcpu->arch.smbase, entering_smm);
if (entering_smm) {
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f18f579ebde81c..85d2a12c214dda 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8138,9 +8138,14 @@ static void emulator_set_nmi_mask(struct x86_emulate_ctxt *ctxt, bool masked)
static_call(kvm_x86_set_nmi_mask)(emul_to_vcpu(ctxt), masked);
}
-static unsigned emulator_get_hflags(struct x86_emulate_ctxt *ctxt)
+static bool emulator_in_smm(struct x86_emulate_ctxt *ctxt)
{
- return emul_to_vcpu(ctxt)->arch.hflags;
+ return emul_to_vcpu(ctxt)->arch.hflags & HF_SMM_MASK;
+}
+
+static bool emulator_in_guest_mode(struct x86_emulate_ctxt *ctxt)
+{
+ return emul_to_vcpu(ctxt)->arch.hflags & HF_GUEST_MASK;
}
#ifndef CONFIG_KVM_SMM
@@ -8209,7 +8214,8 @@ static const struct x86_emulate_ops emulate_ops = {
.guest_has_fxsr = emulator_guest_has_fxsr,
.guest_has_rdpid = emulator_guest_has_rdpid,
.set_nmi_mask = emulator_set_nmi_mask,
- .get_hflags = emulator_get_hflags,
+ .in_smm = emulator_in_smm,
+ .in_guest_mode = emulator_in_guest_mode,
.leave_smm = emulator_leave_smm,
.triple_fault = emulator_triple_fault,
.set_xcr = emulator_set_xcr,
@@ -8281,8 +8287,6 @@ static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
(cs_l && is_long_mode(vcpu)) ? X86EMUL_MODE_PROT64 :
cs_db ? X86EMUL_MODE_PROT32 :
X86EMUL_MODE_PROT16;
- BUILD_BUG_ON(HF_GUEST_MASK != X86EMUL_GUEST_MASK);
-
ctxt->interruptibility = 0;
ctxt->have_exception = false;
ctxt->exception.vector = -1;
--
2.26.3