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authorLaurent Vivier <Laurent.Vivier@bull.net>2008-05-30 10:05:54 -0400
committerAvi Kivity <avi@qumranet.com>2008-07-20 05:42:31 -0400
commit5f94c1741bdc7a336553122036e8a779e616ccbf (patch)
treefb0dc4edf0c346dc266eb2ee2d433cb2678a0bc4 /include/linux
parent92760499d01ef91518119908eb9b8798b6c9bd3f (diff)
KVM: Add coalesced MMIO support (common part)
This patch adds all needed structures to coalesce MMIOs. Until an architecture uses it, it is not compiled. Coalesced MMIO introduces two ioctl() to define where are the MMIO zones that can be coalesced: - KVM_REGISTER_COALESCED_MMIO registers a coalesced MMIO zone. It requests one parameter (struct kvm_coalesced_mmio_zone) which defines a memory area where MMIOs can be coalesced until the next switch to user space. The maximum number of MMIO zones is KVM_COALESCED_MMIO_ZONE_MAX. - KVM_UNREGISTER_COALESCED_MMIO cancels all registered zones inside the given bounds (bounds are also given by struct kvm_coalesced_mmio_zone). The userspace client can check kernel coalesced MMIO availability by asking ioctl(KVM_CHECK_EXTENSION) for the KVM_CAP_COALESCED_MMIO capability. The ioctl() call to KVM_CAP_COALESCED_MMIO will return 0 if not supported, or the page offset where will be stored the ring buffer. The page offset depends on the architecture. After an ioctl(KVM_RUN), the first page of the KVM memory mapped points to a kvm_run structure. The offset given by KVM_CAP_COALESCED_MMIO is an offset to the coalesced MMIO ring expressed in PAGE_SIZE relatively to the address of the start of th kvm_run structure. The MMIO ring buffer is defined by the structure kvm_coalesced_mmio_ring. [akio: fix oops during guest shutdown] Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Akio Takebe <takebe_akio@jp.fujitsu.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/kvm.h29
-rw-r--r--include/linux/kvm_host.h4
2 files changed, 33 insertions, 0 deletions
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index a281afeddfbb..1c908ac29c6c 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -173,6 +173,30 @@ struct kvm_run {
173 }; 173 };
174}; 174};
175 175
176/* for KVM_REGISTER_COALESCED_MMIO / KVM_UNREGISTER_COALESCED_MMIO */
177
178struct kvm_coalesced_mmio_zone {
179 __u64 addr;
180 __u32 size;
181 __u32 pad;
182};
183
184struct kvm_coalesced_mmio {
185 __u64 phys_addr;
186 __u32 len;
187 __u32 pad;
188 __u8 data[8];
189};
190
191struct kvm_coalesced_mmio_ring {
192 __u32 first, last;
193 struct kvm_coalesced_mmio coalesced_mmio[0];
194};
195
196#define KVM_COALESCED_MMIO_MAX \
197 ((PAGE_SIZE - sizeof(struct kvm_coalesced_mmio_ring)) / \
198 sizeof(struct kvm_coalesced_mmio))
199
176/* for KVM_TRANSLATE */ 200/* for KVM_TRANSLATE */
177struct kvm_translation { 201struct kvm_translation {
178 /* in */ 202 /* in */
@@ -346,6 +370,7 @@ struct kvm_trace_rec {
346#define KVM_CAP_NOP_IO_DELAY 12 370#define KVM_CAP_NOP_IO_DELAY 12
347#define KVM_CAP_PV_MMU 13 371#define KVM_CAP_PV_MMU 13
348#define KVM_CAP_MP_STATE 14 372#define KVM_CAP_MP_STATE 14
373#define KVM_CAP_COALESCED_MMIO 15
349 374
350/* 375/*
351 * ioctls for VM fds 376 * ioctls for VM fds
@@ -371,6 +396,10 @@ struct kvm_trace_rec {
371#define KVM_CREATE_PIT _IO(KVMIO, 0x64) 396#define KVM_CREATE_PIT _IO(KVMIO, 0x64)
372#define KVM_GET_PIT _IOWR(KVMIO, 0x65, struct kvm_pit_state) 397#define KVM_GET_PIT _IOWR(KVMIO, 0x65, struct kvm_pit_state)
373#define KVM_SET_PIT _IOR(KVMIO, 0x66, struct kvm_pit_state) 398#define KVM_SET_PIT _IOR(KVMIO, 0x66, struct kvm_pit_state)
399#define KVM_REGISTER_COALESCED_MMIO \
400 _IOW(KVMIO, 0x67, struct kvm_coalesced_mmio_zone)
401#define KVM_UNREGISTER_COALESCED_MMIO \
402 _IOW(KVMIO, 0x68, struct kvm_coalesced_mmio_zone)
374 403
375/* 404/*
376 * ioctls for vcpu fds 405 * ioctls for vcpu fds
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 499ff0604234..d220b4926c4a 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -117,6 +117,10 @@ struct kvm {
117 struct kvm_vm_stat stat; 117 struct kvm_vm_stat stat;
118 struct kvm_arch arch; 118 struct kvm_arch arch;
119 atomic_t users_count; 119 atomic_t users_count;
120#ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
121 struct kvm_coalesced_mmio_dev *coalesced_mmio_dev;
122 struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
123#endif
120}; 124};
121 125
122/* The guest did something we don't support. */ 126/* The guest did something we don't support. */