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authorChristoffer Dall <c.dall@virtualopensystems.com>2013-01-21 03:28:06 +0400
committerChristoffer Dall <c.dall@virtualopensystems.com>2013-01-23 22:29:10 +0400
commit749cf76c5a363e1383108a914ea09530bfa0bd43 (patch)
treea1bd85e41d1a8e6eb13529681431c3aea641d202 /Documentation/virtual
parent9e9a367c29cebd25a356d53414612e115efdadcf (diff)
downloadlinux-749cf76c5a363e1383108a914ea09530bfa0bd43.tar.xz
KVM: ARM: Initial skeleton to compile KVM support
Targets KVM support for Cortex A-15 processors. Contains all the framework components, make files, header files, some tracing functionality, and basic user space API. Only supported core is Cortex-A15 for now. Most functionality is in arch/arm/kvm/* or arch/arm/include/asm/kvm_*.h. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
Diffstat (limited to 'Documentation/virtual')
-rw-r--r--Documentation/virtual/kvm/api.txt57
1 files changed, 53 insertions, 4 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index a4df5535996b..4237c27ea612 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -293,7 +293,7 @@ kvm_run' (see below).
4.11 KVM_GET_REGS
Capability: basic
-Architectures: all
+Architectures: all except ARM
Type: vcpu ioctl
Parameters: struct kvm_regs (out)
Returns: 0 on success, -1 on error
@@ -314,7 +314,7 @@ struct kvm_regs {
4.12 KVM_SET_REGS
Capability: basic
-Architectures: all
+Architectures: all except ARM
Type: vcpu ioctl
Parameters: struct kvm_regs (in)
Returns: 0 on success, -1 on error
@@ -600,7 +600,7 @@ struct kvm_fpu {
4.24 KVM_CREATE_IRQCHIP
Capability: KVM_CAP_IRQCHIP
-Architectures: x86, ia64
+Architectures: x86, ia64, ARM
Type: vm ioctl
Parameters: none
Returns: 0 on success, -1 on error
@@ -608,7 +608,8 @@ Returns: 0 on success, -1 on error
Creates an interrupt controller model in the kernel. On x86, creates a virtual
ioapic, a virtual PIC (two PICs, nested), and sets up future vcpus to have a
local APIC. IRQ routing for GSIs 0-15 is set to both PIC and IOAPIC; GSI 16-23
-only go to the IOAPIC. On ia64, a IOSAPIC is created.
+only go to the IOAPIC. On ia64, a IOSAPIC is created. On ARM, a GIC is
+created.
4.25 KVM_IRQ_LINE
@@ -1775,6 +1776,14 @@ registers, find a list below:
PPC | KVM_REG_PPC_VPA_DTL | 128
PPC | KVM_REG_PPC_EPCR | 32
+ARM registers are mapped using the lower 32 bits. The upper 16 of that
+is the register group type, or coprocessor number:
+
+ARM core registers have the following id bit patterns:
+ 0x4002 0000 0010 <index into the kvm_regs struct:16>
+
+
+
4.69 KVM_GET_ONE_REG
Capability: KVM_CAP_ONE_REG
@@ -2127,6 +2136,46 @@ written, then `n_invalid' invalid entries, invalidating any previously
valid entries found.
+4.77 KVM_ARM_VCPU_INIT
+
+Capability: basic
+Architectures: arm
+Type: vcpu ioctl
+Parameters: struct struct kvm_vcpu_init (in)
+Returns: 0 on success; -1 on error
+Errors:
+  EINVAL:    the target is unknown, or the combination of features is invalid.
+  ENOENT:    a features bit specified is unknown.
+
+This tells KVM what type of CPU to present to the guest, and what
+optional features it should have.  This will cause a reset of the cpu
+registers to their initial values.  If this is not called, KVM_RUN will
+return ENOEXEC for that vcpu.
+
+Note that because some registers reflect machine topology, all vcpus
+should be created before this ioctl is invoked.
+
+
+4.78 KVM_GET_REG_LIST
+
+Capability: basic
+Architectures: arm
+Type: vcpu ioctl
+Parameters: struct kvm_reg_list (in/out)
+Returns: 0 on success; -1 on error
+Errors:
+  E2BIG:     the reg index list is too big to fit in the array specified by
+             the user (the number required will be written into n).
+
+struct kvm_reg_list {
+ __u64 n; /* number of registers in reg[] */
+ __u64 reg[0];
+};
+
+This ioctl returns the guest registers that are supported for the
+KVM_GET_ONE_REG/KVM_SET_ONE_REG calls.
+
+
5. The kvm_run structure
------------------------