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[Qemu-devel] [PATCH] xics_kvm: use KVM helpers

Cédric Le Goater posted 1 patch 5 years, 10 months ago
Patches applied successfully (tree, apply log)
git fetch https://github.com/patchew-project/qemu tags/patchew/20180611162310.19968-1-clg@kaod.org
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hw/intc/xics_kvm.c | 52 ++++++++++++++--------------------------------------
1 file changed, 14 insertions(+), 38 deletions(-)
[Qemu-devel] [PATCH] xics_kvm: use KVM helpers
Posted by Cédric Le Goater 5 years, 10 months ago 
The KVM helpers hide the low level interface used to communicate to
the XICS KVM device and provide a good cleanup to the XICS KVM models.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 hw/intc/xics_kvm.c | 52 ++++++++++++++--------------------------------------
 1 file changed, 14 insertions(+), 38 deletions(-)

diff --git a/hw/intc/xics_kvm.c b/hw/intc/xics_kvm.c
index 89fb20e2c55c..8bdf6afe82a0 100644
--- a/hw/intc/xics_kvm.c
+++ b/hw/intc/xics_kvm.c
@@ -56,10 +56,6 @@ static QLIST_HEAD(, KVMEnabledICP)
 static void icp_get_kvm_state(ICPState *icp)
 {
     uint64_t state;
-    struct kvm_one_reg reg = {
-        .id = KVM_REG_PPC_ICP_STATE,
-        .addr = (uintptr_t)&state,
-    };
     int ret;
 
     /* ICP for this CPU thread is not in use, exiting */
@@ -67,7 +63,7 @@ static void icp_get_kvm_state(ICPState *icp)
         return;
     }
 
-    ret = kvm_vcpu_ioctl(icp->cs, KVM_GET_ONE_REG, &reg);
+    ret = kvm_get_one_reg(icp->cs, KVM_REG_PPC_ICP_STATE, &state);
     if (ret != 0) {
         error_report("Unable to retrieve KVM interrupt controller state"
                 " for CPU %ld: %s", kvm_arch_vcpu_id(icp->cs), strerror(errno));
@@ -96,10 +92,6 @@ static void icp_synchronize_state(ICPState *icp)
 static int icp_set_kvm_state(ICPState *icp, int version_id)
 {
     uint64_t state;
-    struct kvm_one_reg reg = {
-        .id = KVM_REG_PPC_ICP_STATE,
-        .addr = (uintptr_t)&state,
-    };
     int ret;
 
     /* ICP for this CPU thread is not in use, exiting */
@@ -111,7 +103,7 @@ static int icp_set_kvm_state(ICPState *icp, int version_id)
         | ((uint64_t)icp->mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT)
         | ((uint64_t)icp->pending_priority << KVM_REG_PPC_ICP_PPRI_SHIFT);
 
-    ret = kvm_vcpu_ioctl(icp->cs, KVM_SET_ONE_REG, &reg);
+    ret = kvm_set_one_reg(icp->cs, KVM_REG_PPC_ICP_STATE, &state);
     if (ret != 0) {
         error_report("Unable to restore KVM interrupt controller state (0x%"
                 PRIx64 ") for CPU %ld: %s", state, kvm_arch_vcpu_id(icp->cs),
@@ -185,21 +177,15 @@ static const TypeInfo icp_kvm_info = {
 static void ics_get_kvm_state(ICSState *ics)
 {
     uint64_t state;
-    struct kvm_device_attr attr = {
-        .flags = 0,
-        .group = KVM_DEV_XICS_GRP_SOURCES,
-        .addr = (uint64_t)(uintptr_t)&state,
-    };
     int i;
+    Error *local_err = NULL;
 
     for (i = 0; i < ics->nr_irqs; i++) {
         ICSIRQState *irq = &ics->irqs[i];
-        int ret;
-
-        attr.attr = i + ics->offset;
 
-        ret = ioctl(kernel_xics_fd, KVM_GET_DEVICE_ATTR, &attr);
-        if (ret != 0) {
+        kvm_device_access(kernel_xics_fd, KVM_DEV_XICS_GRP_SOURCES,
+                          i + ics->offset, &state, false, &local_err);
+        if (local_err) {
             error_report("Unable to retrieve KVM interrupt controller state"
                     " for IRQ %d: %s", i + ics->offset, strerror(errno));
             exit(1);
@@ -255,19 +241,13 @@ static void ics_synchronize_state(ICSState *ics)
 static int ics_set_kvm_state(ICSState *ics, int version_id)
 {
     uint64_t state;
-    struct kvm_device_attr attr = {
-        .flags = 0,
-        .group = KVM_DEV_XICS_GRP_SOURCES,
-        .addr = (uint64_t)(uintptr_t)&state,
-    };
     int i;
+    Error *local_err = NULL;
 
     for (i = 0; i < ics->nr_irqs; i++) {
         ICSIRQState *irq = &ics->irqs[i];
         int ret;
 
-        attr.attr = i + ics->offset;
-
         state = irq->server;
         state |= (uint64_t)(irq->saved_priority & KVM_XICS_PRIORITY_MASK)
             << KVM_XICS_PRIORITY_SHIFT;
@@ -293,8 +273,9 @@ static int ics_set_kvm_state(ICSState *ics, int version_id)
                 state |= KVM_XICS_QUEUED;
         }
 
-        ret = ioctl(kernel_xics_fd, KVM_SET_DEVICE_ATTR, &attr);
-        if (ret != 0) {
+        kvm_device_access(kernel_xics_fd, KVM_DEV_XICS_GRP_SOURCES,
+                          i + ics->offset, &state, true, &local_err);
+        if (local_err) {
             error_report("Unable to restore KVM interrupt controller state"
                     " for IRQs %d: %s", i + ics->offset, strerror(errno));
             return ret;
@@ -391,10 +372,6 @@ static void rtas_dummy(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 int xics_kvm_init(sPAPRMachineState *spapr, Error **errp)
 {
     int rc;
-    struct kvm_create_device xics_create_device = {
-        .type = KVM_DEV_TYPE_XICS,
-        .flags = 0,
-    };
 
     if (!kvm_enabled() || !kvm_check_extension(kvm_state, KVM_CAP_IRQ_XICS)) {
         error_setg(errp,
@@ -431,20 +408,19 @@ int xics_kvm_init(sPAPRMachineState *spapr, Error **errp)
         goto fail;
     }
 
-    /* Create the kernel ICP */
-    rc = kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &xics_create_device);
+    /* Create the KVM XICS device */
+    rc = kvm_create_device(kvm_state, KVM_DEV_TYPE_XICS, false);
     if (rc < 0) {
         error_setg_errno(errp, -rc, "Error on KVM_CREATE_DEVICE for XICS");
         goto fail;
     }
 
-    kernel_xics_fd = xics_create_device.fd;
-
+    kernel_xics_fd = rc;
     kvm_kernel_irqchip = true;
     kvm_msi_via_irqfd_allowed = true;
     kvm_gsi_direct_mapping = true;
 
-    return rc;
+    return 0;
 
 fail:
     kvmppc_define_rtas_kernel_token(0, "ibm,set-xive");
-- 
2.13.6
Re: [Qemu-devel] [PATCH] xics_kvm: use KVM helpers
Posted by David Gibson 5 years, 10 months ago 
On Mon, Jun 11, 2018 at 06:23:10PM +0200, Cédric Le Goater wrote:
> The KVM helpers hide the low level interface used to communicate to
> the XICS KVM device and provide a good cleanup to the XICS KVM models.
> 
> Signed-off-by: Cédric Le Goater <clg@kaod.org>

Applied to ppc-for-3.0, thanks.

> ---
>  hw/intc/xics_kvm.c | 52 ++++++++++++++--------------------------------------
>  1 file changed, 14 insertions(+), 38 deletions(-)
> 
> diff --git a/hw/intc/xics_kvm.c b/hw/intc/xics_kvm.c
> index 89fb20e2c55c..8bdf6afe82a0 100644
> --- a/hw/intc/xics_kvm.c
> +++ b/hw/intc/xics_kvm.c
> @@ -56,10 +56,6 @@ static QLIST_HEAD(, KVMEnabledICP)
>  static void icp_get_kvm_state(ICPState *icp)
>  {
>      uint64_t state;
> -    struct kvm_one_reg reg = {
> -        .id = KVM_REG_PPC_ICP_STATE,
> -        .addr = (uintptr_t)&state,
> -    };
>      int ret;
>  
>      /* ICP for this CPU thread is not in use, exiting */
> @@ -67,7 +63,7 @@ static void icp_get_kvm_state(ICPState *icp)
>          return;
>      }
>  
> -    ret = kvm_vcpu_ioctl(icp->cs, KVM_GET_ONE_REG, &reg);
> +    ret = kvm_get_one_reg(icp->cs, KVM_REG_PPC_ICP_STATE, &state);
>      if (ret != 0) {
>          error_report("Unable to retrieve KVM interrupt controller state"
>                  " for CPU %ld: %s", kvm_arch_vcpu_id(icp->cs), strerror(errno));
> @@ -96,10 +92,6 @@ static void icp_synchronize_state(ICPState *icp)
>  static int icp_set_kvm_state(ICPState *icp, int version_id)
>  {
>      uint64_t state;
> -    struct kvm_one_reg reg = {
> -        .id = KVM_REG_PPC_ICP_STATE,
> -        .addr = (uintptr_t)&state,
> -    };
>      int ret;
>  
>      /* ICP for this CPU thread is not in use, exiting */
> @@ -111,7 +103,7 @@ static int icp_set_kvm_state(ICPState *icp, int version_id)
>          | ((uint64_t)icp->mfrr << KVM_REG_PPC_ICP_MFRR_SHIFT)
>          | ((uint64_t)icp->pending_priority << KVM_REG_PPC_ICP_PPRI_SHIFT);
>  
> -    ret = kvm_vcpu_ioctl(icp->cs, KVM_SET_ONE_REG, &reg);
> +    ret = kvm_set_one_reg(icp->cs, KVM_REG_PPC_ICP_STATE, &state);
>      if (ret != 0) {
>          error_report("Unable to restore KVM interrupt controller state (0x%"
>                  PRIx64 ") for CPU %ld: %s", state, kvm_arch_vcpu_id(icp->cs),
> @@ -185,21 +177,15 @@ static const TypeInfo icp_kvm_info = {
>  static void ics_get_kvm_state(ICSState *ics)
>  {
>      uint64_t state;
> -    struct kvm_device_attr attr = {
> -        .flags = 0,
> -        .group = KVM_DEV_XICS_GRP_SOURCES,
> -        .addr = (uint64_t)(uintptr_t)&state,
> -    };
>      int i;
> +    Error *local_err = NULL;
>  
>      for (i = 0; i < ics->nr_irqs; i++) {
>          ICSIRQState *irq = &ics->irqs[i];
> -        int ret;
> -
> -        attr.attr = i + ics->offset;
>  
> -        ret = ioctl(kernel_xics_fd, KVM_GET_DEVICE_ATTR, &attr);
> -        if (ret != 0) {
> +        kvm_device_access(kernel_xics_fd, KVM_DEV_XICS_GRP_SOURCES,
> +                          i + ics->offset, &state, false, &local_err);
> +        if (local_err) {
>              error_report("Unable to retrieve KVM interrupt controller state"
>                      " for IRQ %d: %s", i + ics->offset, strerror(errno));
>              exit(1);
> @@ -255,19 +241,13 @@ static void ics_synchronize_state(ICSState *ics)
>  static int ics_set_kvm_state(ICSState *ics, int version_id)
>  {
>      uint64_t state;
> -    struct kvm_device_attr attr = {
> -        .flags = 0,
> -        .group = KVM_DEV_XICS_GRP_SOURCES,
> -        .addr = (uint64_t)(uintptr_t)&state,
> -    };
>      int i;
> +    Error *local_err = NULL;
>  
>      for (i = 0; i < ics->nr_irqs; i++) {
>          ICSIRQState *irq = &ics->irqs[i];
>          int ret;
>  
> -        attr.attr = i + ics->offset;
> -
>          state = irq->server;
>          state |= (uint64_t)(irq->saved_priority & KVM_XICS_PRIORITY_MASK)
>              << KVM_XICS_PRIORITY_SHIFT;
> @@ -293,8 +273,9 @@ static int ics_set_kvm_state(ICSState *ics, int version_id)
>                  state |= KVM_XICS_QUEUED;
>          }
>  
> -        ret = ioctl(kernel_xics_fd, KVM_SET_DEVICE_ATTR, &attr);
> -        if (ret != 0) {
> +        kvm_device_access(kernel_xics_fd, KVM_DEV_XICS_GRP_SOURCES,
> +                          i + ics->offset, &state, true, &local_err);
> +        if (local_err) {
>              error_report("Unable to restore KVM interrupt controller state"
>                      " for IRQs %d: %s", i + ics->offset, strerror(errno));
>              return ret;
> @@ -391,10 +372,6 @@ static void rtas_dummy(PowerPCCPU *cpu, sPAPRMachineState *spapr,
>  int xics_kvm_init(sPAPRMachineState *spapr, Error **errp)
>  {
>      int rc;
> -    struct kvm_create_device xics_create_device = {
> -        .type = KVM_DEV_TYPE_XICS,
> -        .flags = 0,
> -    };
>  
>      if (!kvm_enabled() || !kvm_check_extension(kvm_state, KVM_CAP_IRQ_XICS)) {
>          error_setg(errp,
> @@ -431,20 +408,19 @@ int xics_kvm_init(sPAPRMachineState *spapr, Error **errp)
>          goto fail;
>      }
>  
> -    /* Create the kernel ICP */
> -    rc = kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &xics_create_device);
> +    /* Create the KVM XICS device */
> +    rc = kvm_create_device(kvm_state, KVM_DEV_TYPE_XICS, false);
>      if (rc < 0) {
>          error_setg_errno(errp, -rc, "Error on KVM_CREATE_DEVICE for XICS");
>          goto fail;
>      }
>  
> -    kernel_xics_fd = xics_create_device.fd;
> -
> +    kernel_xics_fd = rc;
>      kvm_kernel_irqchip = true;
>      kvm_msi_via_irqfd_allowed = true;
>      kvm_gsi_direct_mapping = true;
>  
> -    return rc;
> +    return 0;
>  
>  fail:
>      kvmppc_define_rtas_kernel_token(0, "ibm,set-xive");

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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