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[Qemu-devel] [PULL 16/17] kvm: add kvm_device_supported() helper functio
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PULL 16/17] kvm: add kvm_device_supported() helper function |
Date: |
Wed, 30 Mar 2016 15:57:48 +0100 |
From: Peter Xu <address@hidden>
This can be used when probing whether KVM support specific device. Here,
a raw vmfd is used.
Signed-off-by: Peter Xu <address@hidden>
Acked-by: Sergey Fedorov <address@hidden>
Message-id: address@hidden
Reviewed-by: Peter Maydell <address@hidden>
Signed-off-by: Peter Maydell <address@hidden>
---
include/sysemu/kvm.h | 9 +++++++++
kvm-all.c | 15 +++++++++++++++
2 files changed, 24 insertions(+)
diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index 6695fa7..0e18f15 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -306,6 +306,15 @@ void kvm_device_access(int fd, int group, uint64_t attr,
*/
int kvm_create_device(KVMState *s, uint64_t type, bool test);
+/**
+ * kvm_device_supported - probe whether KVM supports specific device
+ *
+ * @vmfd: The fd handler for VM
+ * @type: type of device
+ *
+ * @return: true if supported, otherwise false.
+ */
+bool kvm_device_supported(int vmfd, uint64_t type);
/* Arch specific hooks */
diff --git a/kvm-all.c b/kvm-all.c
index 44c0464..e7b66df 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -2339,6 +2339,21 @@ int kvm_create_device(KVMState *s, uint64_t type, bool
test)
return test ? 0 : create_dev.fd;
}
+bool kvm_device_supported(int vmfd, uint64_t type)
+{
+ struct kvm_create_device create_dev = {
+ .type = type,
+ .fd = -1,
+ .flags = KVM_CREATE_DEVICE_TEST,
+ };
+
+ if (ioctl(vmfd, KVM_CHECK_EXTENSION, KVM_CAP_DEVICE_CTRL) <= 0) {
+ return false;
+ }
+
+ return (ioctl(vmfd, KVM_CREATE_DEVICE, &create_dev) >= 0);
+}
+
int kvm_set_one_reg(CPUState *cs, uint64_t id, void *source)
{
struct kvm_one_reg reg;
--
1.9.1
- [Qemu-devel] [PULL 12/17] block: m25p80: n25q256a/n25q512a models, (continued)
- [Qemu-devel] [PULL 12/17] block: m25p80: n25q256a/n25q512a models, Peter Maydell, 2016/03/30
- [Qemu-devel] [PULL 11/17] block: m25p80: Implemented FSR register, Peter Maydell, 2016/03/30
- [Qemu-devel] [PULL 14/17] arm: qmp: add query-gic-capabilities interface, Peter Maydell, 2016/03/30
- [Qemu-devel] [PULL 13/17] block: m25p80: at25128a/at25256a models, Peter Maydell, 2016/03/30
- [Qemu-devel] [PULL 04/17] block: m25p80: RESET_ENABLE and RESET_MEMORY commands, Peter Maydell, 2016/03/30
- [Qemu-devel] [PULL 09/17] block: m25p80: Dummy cycles for N25Q256/512, Peter Maydell, 2016/03/30
- [Qemu-devel] [PULL 06/17] block: m25p80: Extend address mode, Peter Maydell, 2016/03/30
- [Qemu-devel] [PULL 08/17] block: m25p80: Add configuration registers, Peter Maydell, 2016/03/30
- [Qemu-devel] [PULL 07/17] block: m25p80: 4byte address mode, Peter Maydell, 2016/03/30
- [Qemu-devel] [PULL 05/17] block: m25p80: Widen flags variable, Peter Maydell, 2016/03/30
- [Qemu-devel] [PULL 16/17] kvm: add kvm_device_supported() helper function,
Peter Maydell <=
- [Qemu-devel] [PULL 10/17] block: m25p80: Fast read and 4bytes commands, Peter Maydell, 2016/03/30
- [Qemu-devel] [PULL 15/17] arm: enhance kvm_arm_create_scratch_host_vcpu, Peter Maydell, 2016/03/30
- [Qemu-devel] [PULL 01/17] hw/gpio: Add the emulation of gpio_key, Peter Maydell, 2016/03/30
- [Qemu-devel] [PULL 02/17] ARM: Virt: Use gpio_key for power button, Peter Maydell, 2016/03/30
- [Qemu-devel] [PULL 03/17] block: m25p80: Removed unused variable, Peter Maydell, 2016/03/30
- Re: [Qemu-devel] [PULL 00/17] target-arm queue, Peter Maydell, 2016/03/30