[PATCH v6 05/12] KVM: SVM: Modify 64 bit intercept field to two 32 bit vectors

Babu Moger
2020-09-11T19:30:10Z

Convert all the intercepts to one array of 32 bit vectors in
vmcb_control_area. This makes it easy for future intercept vector
additions. Also update trace functions.

Signed-off-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
---
arch/x86/include/asm/svm.h | 14 +++++++-------
arch/x86/kvm/svm/nested.c | 25 ++++++++++---------------
arch/x86/kvm/svm/svm.c | 16 ++++++----------
arch/x86/kvm/svm/svm.h | 12 ++++++------
arch/x86/kvm/trace.h | 18 +++++++++++-------
5 files changed, 40 insertions(+), 45 deletions(-)

diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
index 51833a611eba..9f0fa02fc838 100644
--- a/arch/x86/include/asm/svm.h
+++ b/arch/x86/include/asm/svm.h
@@ -14,6 +14,8 @@ enum vector_offset {
CR_VECTOR = 0,
DR_VECTOR,
EXCEPTION_VECTOR,
+ INTERCEPT_VECTOR_3,
+ INTERCEPT_VECTOR_4,
MAX_VECTORS,
};

@@ -73,10 +75,8 @@ enum {
INTERCEPT_MC_VECTOR = 64 + MC_VECTOR,
INTERCEPT_XM_VECTOR = 64 + XM_VECTOR,
INTERCEPT_VE_VECTOR = 64 + VE_VECTOR,
-};
-
-enum {
- INTERCEPT_INTR,
+ /* Byte offset 00Ch (Vector 3) */
+ INTERCEPT_INTR = 96,
INTERCEPT_NMI,
INTERCEPT_SMI,
INTERCEPT_INIT,
@@ -108,7 +108,8 @@ enum {
INTERCEPT_TASK_SWITCH,
INTERCEPT_FERR_FREEZE,
INTERCEPT_SHUTDOWN,
- INTERCEPT_VMRUN,
+ /* Byte offset 010h (Vector 4) */
+ INTERCEPT_VMRUN = 128,
INTERCEPT_VMMCALL,
INTERCEPT_VMLOAD,
INTERCEPT_VMSAVE,
@@ -128,8 +129,7 @@ enum {

struct __attribute__ ((__packed__)) vmcb_control_area {
u32 intercepts[MAX_VECTORS];
- u64 intercept;
- u8 reserved_1[40];
+ u32 reserved_1[15 - MAX_VECTORS];
u16 pause_filter_thresh;
u16 pause_filter_count;
u64 iopm_base_pa;
diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index c161bd38f401..353d550a5bb7 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -114,8 +114,6 @@ void recalc_intercepts(struct vcpu_svm *svm)
for (i = 0; i < MAX_VECTORS; i++)
c->intercepts[i] = h->intercepts[i];

- c->intercept = h->intercept;
-
if (g->int_ctl & V_INTR_MASKING_MASK) {
/* We only want the cr8 intercept bits of L1 */
vmcb_clr_intercept(c, INTERCEPT_CR8_READ);
@@ -126,16 +124,14 @@ void recalc_intercepts(struct vcpu_svm *svm)
* affect any interrupt we may want to inject; therefore,
* interrupt window vmexits are irrelevant to L0.
*/
- c->intercept &= ~(1ULL << INTERCEPT_VINTR);
+ vmcb_clr_intercept(c, INTERCEPT_VINTR);
}

/* We don't want to see VMMCALLs from a nested guest */
- c->intercept &= ~(1ULL << INTERCEPT_VMMCALL);
+ vmcb_clr_intercept(c, INTERCEPT_VMMCALL);

for (i = 0; i < MAX_VECTORS; i++)
c->intercepts[i] |= g->intercepts[i];
-
- c->intercept |= g->intercept;
}

static void copy_vmcb_control_area(struct vmcb_control_area *dst,
@@ -146,7 +142,6 @@ static void copy_vmcb_control_area(struct vmcb_control_area *dst,
for (i = 0; i < MAX_VECTORS; i++)
dst->intercepts[i] = from->intercepts[i];

- dst->intercept = from->intercept;
dst->iopm_base_pa = from->iopm_base_pa;
dst->msrpm_base_pa = from->msrpm_base_pa;
dst->tsc_offset = from->tsc_offset;
@@ -179,7 +174,7 @@ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)
*/
int i;

- if (!(svm->nested.ctl.intercept & (1ULL << INTERCEPT_MSR_PROT)))
+ if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT)))
return true;

for (i = 0; i < MSRPM_OFFSETS; i++) {
@@ -205,7 +200,7 @@ static bool nested_svm_vmrun_msrpm(struct vcpu_svm *svm)

static bool nested_vmcb_check_controls(struct vmcb_control_area *control)
{
- if ((control->intercept & (1ULL << INTERCEPT_VMRUN)) == 0)
+ if ((vmcb_is_intercept(control, INTERCEPT_VMRUN)) == 0)
return false;

if (control->asid == 0)
@@ -493,7 +488,8 @@ int nested_svm_vmrun(struct vcpu_svm *svm)
trace_kvm_nested_intercepts(nested_vmcb->control.intercepts[CR_VECTOR] & 0xffff,
nested_vmcb->control.intercepts[CR_VECTOR] >> 16,
nested_vmcb->control.intercepts[EXCEPTION_VECTOR],
- nested_vmcb->control.intercept);
+ nested_vmcb->control.intercepts[INTERCEPT_VECTOR_3],
+ nested_vmcb->control.intercepts[INTERCEPT_VECTOR_4]);

/* Clear internal status */
kvm_clear_exception_queue(&svm->vcpu);
@@ -710,7 +706,7 @@ static int nested_svm_exit_handled_msr(struct vcpu_svm *svm)
u32 offset, msr, value;
int write, mask;

- if (!(svm->nested.ctl.intercept & (1ULL << INTERCEPT_MSR_PROT)))
+ if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_MSR_PROT)))
return NESTED_EXIT_HOST;

msr = svm->vcpu.arch.regs[VCPU_REGS_RCX];
@@ -737,7 +733,7 @@ static int nested_svm_intercept_ioio(struct vcpu_svm *svm)
u8 start_bit;
u64 gpa;

- if (!(svm->nested.ctl.intercept & (1ULL << INTERCEPT_IOIO_PROT)))
+ if (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_IOIO_PROT)))
return NESTED_EXIT_HOST;

port = svm->vmcb->control.exit_info_1 >> 16;
@@ -791,8 +787,7 @@ static int nested_svm_intercept(struct vcpu_svm *svm)
break;
}
default: {
- u64 exit_bits = 1ULL << (exit_code - SVM_EXIT_INTR);
- if (svm->nested.ctl.intercept & exit_bits)
+ if (vmcb_is_intercept(&svm->nested.ctl, exit_code))
vmexit = NESTED_EXIT_DONE;
}
}
@@ -900,7 +895,7 @@ static void nested_svm_intr(struct vcpu_svm *svm)

static inline bool nested_exit_on_init(struct vcpu_svm *svm)
{
- return (svm->nested.ctl.intercept & (1ULL << INTERCEPT_INIT));
+ return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_INIT);
}

static void nested_svm_init(struct vcpu_svm *svm)
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 11892e86cb39..17bfa34033ac 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2218,12 +2218,9 @@ static bool check_selective_cr0_intercepted(struct vcpu_svm *svm,
{
unsigned long cr0 = svm->vcpu.arch.cr0;
bool ret = false;
- u64 intercept;
-
- intercept = svm->nested.ctl.intercept;

if (!is_guest_mode(&svm->vcpu) ||
- (!(intercept & (1ULL << INTERCEPT_SELECTIVE_CR0))))
+ (!(vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_SELECTIVE_CR0))))
return false;

cr0 &= ~SVM_CR0_SELECTIVE_MASK;
@@ -2818,7 +2815,8 @@ static void dump_vmcb(struct kvm_vcpu *vcpu)
pr_err("%-20s%04x\n", "dr_read:", control->intercepts[DR_VECTOR] & 0xffff);
pr_err("%-20s%04x\n", "dr_write:", control->intercepts[DR_VECTOR] >> 16);
pr_err("%-20s%08x\n", "exceptions:", control->intercepts[EXCEPTION_VECTOR]);
- pr_err("%-20s%016llx\n", "intercepts:", control->intercept);
+ pr_err("%-20s%08x\n", "intercept1:", control->intercepts[INTERCEPT_VECTOR_3]);
+ pr_err("%-20s%08x\n", "intercept2:", control->intercepts[INTERCEPT_VECTOR_4]);
pr_err("%-20s%d\n", "pause filter count:", control->pause_filter_count);
pr_err("%-20s%d\n", "pause filter threshold:",
control->pause_filter_thresh);
@@ -3738,7 +3736,6 @@ static int svm_check_intercept(struct kvm_vcpu *vcpu,
break;
case SVM_EXIT_WRITE_CR0: {
unsigned long cr0, val;
- u64 intercept;

if (info->intercept == x86_intercept_cr_write)
icpt_info.exit_code += info->modrm_reg;
@@ -3747,9 +3744,8 @@ static int svm_check_intercept(struct kvm_vcpu *vcpu,
info->intercept == x86_intercept_clts)
break;

- intercept = svm->nested.ctl.intercept;
-
- if (!(intercept & (1ULL << INTERCEPT_SELECTIVE_CR0)))
+ if (!(vmcb_is_intercept(&svm->nested.ctl,
+ INTERCEPT_SELECTIVE_CR0)))
break;

cr0 = vcpu->arch.cr0 & ~SVM_CR0_SELECTIVE_MASK;
@@ -4010,7 +4006,7 @@ static bool svm_apic_init_signal_blocked(struct kvm_vcpu *vcpu)
* if an INIT signal is pending.
*/
return !gif_set(svm) ||
- (svm->vmcb->control.intercept & (1ULL << INTERCEPT_INIT));
+ (vmcb_is_intercept(&svm->vmcb->control, INTERCEPT_INIT));
}

static void svm_vm_destroy(struct kvm *kvm)
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 2fc305f647a3..2cde5091775a 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -309,7 +309,7 @@ static inline void svm_set_intercept(struct vcpu_svm *svm, int bit)
{
struct vmcb *vmcb = get_host_vmcb(svm);

- vmcb->control.intercept |= (1ULL << bit);
+ vmcb_set_intercept(&vmcb->control, bit);

recalc_intercepts(svm);
}
@@ -318,14 +318,14 @@ static inline void svm_clr_intercept(struct vcpu_svm *svm, int bit)
{
struct vmcb *vmcb = get_host_vmcb(svm);

- vmcb->control.intercept &= ~(1ULL << bit);
+ vmcb_clr_intercept(&vmcb->control, bit);

recalc_intercepts(svm);
}

static inline bool svm_is_intercept(struct vcpu_svm *svm, int bit)
{
- return (svm->vmcb->control.intercept & (1ULL << bit)) != 0;
+ return vmcb_is_intercept(&svm->vmcb->control, bit);
}

static inline bool vgif_enabled(struct vcpu_svm *svm)
@@ -389,17 +389,17 @@ static inline bool nested_svm_virtualize_tpr(struct kvm_vcpu *vcpu)

static inline bool nested_exit_on_smi(struct vcpu_svm *svm)
{
- return (svm->nested.ctl.intercept & (1ULL << INTERCEPT_SMI));
+ return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_SMI);
}

static inline bool nested_exit_on_intr(struct vcpu_svm *svm)
{
- return (svm->nested.ctl.intercept & (1ULL << INTERCEPT_INTR));
+ return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_INTR);
}

static inline bool nested_exit_on_nmi(struct vcpu_svm *svm)
{
- return (svm->nested.ctl.intercept & (1ULL << INTERCEPT_NMI));
+ return vmcb_is_intercept(&svm->nested.ctl, INTERCEPT_NMI);
}

int enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index b66432b015d2..6e7262229e6a 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -544,26 +544,30 @@ TRACE_EVENT(kvm_nested_vmrun,
);

TRACE_EVENT(kvm_nested_intercepts,
- TP_PROTO(__u16 cr_read, __u16 cr_write, __u32 exceptions, __u64 intercept),
- TP_ARGS(cr_read, cr_write, exceptions, intercept),
+ TP_PROTO(__u16 cr_read, __u16 cr_write, __u32 exceptions, __u32 intercept1,
+ __u32 intercept2),
+ TP_ARGS(cr_read, cr_write, exceptions, intercept1, intercept2),

TP_STRUCT__entry(
__field( __u16, cr_read )
__field( __u16, cr_write )
__field( __u32, exceptions )
- __field( __u64, intercept )
+ __field( __u32, intercept1 )
+ __field( __u32, intercept2 )
),

TP_fast_assign(
__entry->cr_read = cr_read;
__entry->cr_write = cr_write;
__entry->exceptions = exceptions;
- __entry->intercept = intercept;
+ __entry->intercept1 = intercept1;
+ __entry->intercept2 = intercept2;
),

- TP_printk("cr_read: %04x cr_write: %04x excp: %08x intercept: %016llx",
- __entry->cr_read, __entry->cr_write, __entry->exceptions,
- __entry->intercept)
+ TP_printk("cr_read: %04x cr_write: %04x excp: %08x "
+ "intercept1: %08x intercept2: %08x",
+ __entry->cr_read, __entry->cr_write, __entry->exceptions,
+ __entry->intercept1, __entry->intercept2)
);
/*
* Tracepoint for #VMEXIT while nested