diff mbox series

[13/26] KVM: remove kvm_arch_cpu_check_are_resettable

Message ID 20240322181116.1228416-14-pbonzini@redhat.com
State New
Headers show
Series x86, kvm: common confidential computing subset | expand

Commit Message

Paolo Bonzini March 22, 2024, 6:11 p.m. UTC 
Board reset requires writing a fresh CPU state.  As far as KVM is
concerned, the only thing that blocks reset is that CPU state is
encrypted; therefore, kvm_cpus_are_resettable() can simply check
if that is the case.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 include/sysemu/kvm.h       | 10 ----------
 accel/kvm/kvm-accel-ops.c  |  2 +-
 accel/kvm/kvm-all.c        |  5 -----
 target/arm/kvm.c           |  5 -----
 target/i386/kvm/kvm.c      |  5 -----
 target/loongarch/kvm/kvm.c |  5 -----
 target/mips/kvm.c          |  5 -----
 target/ppc/kvm.c           |  5 -----
 target/riscv/kvm/kvm-cpu.c |  5 -----
 target/s390x/kvm/kvm.c     |  5 -----
 10 files changed, 1 insertion(+), 51 deletions(-)

Comments

Philippe Mathieu-Daudé March 25, 2024, 9:26 a.m. UTC | #1 
On 22/3/24 19:11, Paolo Bonzini wrote:
> Board reset requires writing a fresh CPU state.  As far as KVM is
> concerned, the only thing that blocks reset is that CPU state is
> encrypted; therefore, kvm_cpus_are_resettable() can simply check
> if that is the case.
> 
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
>   include/sysemu/kvm.h       | 10 ----------
>   accel/kvm/kvm-accel-ops.c  |  2 +-
>   accel/kvm/kvm-all.c        |  5 -----
>   target/arm/kvm.c           |  5 -----
>   target/i386/kvm/kvm.c      |  5 -----
>   target/loongarch/kvm/kvm.c |  5 -----
>   target/mips/kvm.c          |  5 -----
>   target/ppc/kvm.c           |  5 -----
>   target/riscv/kvm/kvm-cpu.c |  5 -----
>   target/s390x/kvm/kvm.c     |  5 -----
>   10 files changed, 1 insertion(+), 51 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
diff mbox series

Patch

diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index 302e8f6f1e5..54f4d83a370 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -525,16 +525,6 @@  int kvm_get_one_reg(CPUState *cs, uint64_t id, void *target);
 /* Notify resamplefd for EOI of specific interrupts. */
 void kvm_resample_fd_notify(int gsi);
 
-/**
- * kvm_cpu_check_are_resettable - return whether CPUs can be reset
- *
- * Returns: true: CPUs are resettable
- *          false: CPUs are not resettable
- */
-bool kvm_cpu_check_are_resettable(void);
-
-bool kvm_arch_cpu_check_are_resettable(void);
-
 bool kvm_dirty_ring_enabled(void);
 
 uint32_t kvm_dirty_ring_size(void);
diff --git a/accel/kvm/kvm-accel-ops.c b/accel/kvm/kvm-accel-ops.c
index b3c946dc4b4..74e3c5785b5 100644
--- a/accel/kvm/kvm-accel-ops.c
+++ b/accel/kvm/kvm-accel-ops.c
@@ -82,7 +82,7 @@  static bool kvm_vcpu_thread_is_idle(CPUState *cpu)
 
 static bool kvm_cpus_are_resettable(void)
 {
-    return !kvm_enabled() || kvm_cpu_check_are_resettable();
+    return !kvm_enabled() || !kvm_state->guest_state_protected;
 }
 
 #ifdef KVM_CAP_SET_GUEST_DEBUG
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 05fa3533c66..a05dea23133 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2691,11 +2691,6 @@  void kvm_flush_coalesced_mmio_buffer(void)
     s->coalesced_flush_in_progress = false;
 }
 
-bool kvm_cpu_check_are_resettable(void)
-{
-    return kvm_arch_cpu_check_are_resettable();
-}
-
 static void do_kvm_cpu_synchronize_state(CPUState *cpu, run_on_cpu_data arg)
 {
     if (!cpu->vcpu_dirty && !kvm_state->guest_state_protected) {
diff --git a/target/arm/kvm.c b/target/arm/kvm.c
index ab85d628a8b..21ebbf3b8f8 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -1598,11 +1598,6 @@  int kvm_arch_msi_data_to_gsi(uint32_t data)
     return (data - 32) & 0xffff;
 }
 
-bool kvm_arch_cpu_check_are_resettable(void)
-{
-    return true;
-}
-
 static void kvm_arch_get_eager_split_size(Object *obj, Visitor *v,
                                           const char *name, void *opaque,
                                           Error **errp)
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index de10155b37a..0ec69109a2b 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -5614,11 +5614,6 @@  bool kvm_has_waitpkg(void)
     return has_msr_umwait;
 }
 
-bool kvm_arch_cpu_check_are_resettable(void)
-{
-    return !sev_es_enabled();
-}
-
 #define ARCH_REQ_XCOMP_GUEST_PERM       0x1025
 
 void kvm_request_xsave_components(X86CPU *cpu, uint64_t mask)
diff --git a/target/loongarch/kvm/kvm.c b/target/loongarch/kvm/kvm.c
index d630cc39cb2..8224d943331 100644
--- a/target/loongarch/kvm/kvm.c
+++ b/target/loongarch/kvm/kvm.c
@@ -733,11 +733,6 @@  bool kvm_arch_stop_on_emulation_error(CPUState *cs)
     return true;
 }
 
-bool kvm_arch_cpu_check_are_resettable(void)
-{
-    return true;
-}
-
 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 {
     int ret = 0;
diff --git a/target/mips/kvm.c b/target/mips/kvm.c
index 6c52e59f55d..a631ab544f5 100644
--- a/target/mips/kvm.c
+++ b/target/mips/kvm.c
@@ -1273,11 +1273,6 @@  int kvm_arch_get_default_type(MachineState *machine)
     return -1;
 }
 
-bool kvm_arch_cpu_check_are_resettable(void)
-{
-    return true;
-}
-
 void kvm_arch_accel_class_init(ObjectClass *oc)
 {
 }
diff --git a/target/ppc/kvm.c b/target/ppc/kvm.c
index 8231feb2d45..63930d4a77d 100644
--- a/target/ppc/kvm.c
+++ b/target/ppc/kvm.c
@@ -2956,11 +2956,6 @@  void kvmppc_set_reg_tb_offset(PowerPCCPU *cpu, int64_t tb_offset)
     }
 }
 
-bool kvm_arch_cpu_check_are_resettable(void)
-{
-    return true;
-}
-
 void kvm_arch_accel_class_init(ObjectClass *oc)
 {
 }
diff --git a/target/riscv/kvm/kvm-cpu.c b/target/riscv/kvm/kvm-cpu.c
index cda7d78a778..135d87dc3f5 100644
--- a/target/riscv/kvm/kvm-cpu.c
+++ b/target/riscv/kvm/kvm-cpu.c
@@ -1466,11 +1466,6 @@  void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level)
     }
 }
 
-bool kvm_arch_cpu_check_are_resettable(void)
-{
-    return true;
-}
-
 static int aia_mode;
 
 static const char *kvm_aia_mode_str(uint64_t mode)
diff --git a/target/s390x/kvm/kvm.c b/target/s390x/kvm/kvm.c
index 4ce809c5d46..4dcd757cdcc 100644
--- a/target/s390x/kvm/kvm.c
+++ b/target/s390x/kvm/kvm.c
@@ -2622,11 +2622,6 @@  void kvm_s390_stop_interrupt(S390CPU *cpu)
     kvm_s390_vcpu_interrupt(cpu, &irq);
 }
 
-bool kvm_arch_cpu_check_are_resettable(void)
-{
-    return true;
-}
-
 int kvm_s390_get_zpci_op(void)
 {
     return cap_zpci_op;