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authorPaul Mackerras <paulus@samba.org>2011-06-29 00:25:44 +0000
committerAvi Kivity <avi@redhat.com>2011-07-12 13:16:57 +0300
commitaa04b4cc5be64b4fb9ef4e0fdf2418e2f4737fb2 (patch)
tree97a3ff14e43424e28a27e0f3be088649818c1b76 /arch/powerpc/include
parent371fefd6f2dc46668e00871930dde613b88d4bde (diff)
downloadop-kernel-dev-aa04b4cc5be64b4fb9ef4e0fdf2418e2f4737fb2.zip
op-kernel-dev-aa04b4cc5be64b4fb9ef4e0fdf2418e2f4737fb2.tar.gz
KVM: PPC: Allocate RMAs (Real Mode Areas) at boot for use by guests
This adds infrastructure which will be needed to allow book3s_hv KVM to run on older POWER processors, including PPC970, which don't support the Virtual Real Mode Area (VRMA) facility, but only the Real Mode Offset (RMO) facility. These processors require a physically contiguous, aligned area of memory for each guest. When the guest does an access in real mode (MMU off), the address is compared against a limit value, and if it is lower, the address is ORed with an offset value (from the Real Mode Offset Register (RMOR)) and the result becomes the real address for the access. The size of the RMA has to be one of a set of supported values, which usually includes 64MB, 128MB, 256MB and some larger powers of 2. Since we are unlikely to be able to allocate 64MB or more of physically contiguous memory after the kernel has been running for a while, we allocate a pool of RMAs at boot time using the bootmem allocator. The size and number of the RMAs can be set using the kvm_rma_size=xx and kvm_rma_count=xx kernel command line options. KVM exports a new capability, KVM_CAP_PPC_RMA, to signal the availability of the pool of preallocated RMAs. The capability value is 1 if the processor can use an RMA but doesn't require one (because it supports the VRMA facility), or 2 if the processor requires an RMA for each guest. This adds a new ioctl, KVM_ALLOCATE_RMA, which allocates an RMA from the pool and returns a file descriptor which can be used to map the RMA. It also returns the size of the RMA in the argument structure. Having an RMA means we will get multiple KMV_SET_USER_MEMORY_REGION ioctl calls from userspace. To cope with this, we now preallocate the kvm->arch.ram_pginfo array when the VM is created with a size sufficient for up to 64GB of guest memory. Subsequently we will get rid of this array and use memory associated with each memslot instead. This moves most of the code that translates the user addresses into host pfns (page frame numbers) out of kvmppc_prepare_vrma up one level to kvmppc_core_prepare_memory_region. Also, instead of having to look up the VMA for each page in order to check the page size, we now check that the pages we get are compound pages of 16MB. However, if we are adding memory that is mapped to an RMA, we don't bother with calling get_user_pages_fast and instead just offset from the base pfn for the RMA. Typically the RMA gets added after vcpus are created, which makes it inconvenient to have the LPCR (logical partition control register) value in the vcpu->arch struct, since the LPCR controls whether the processor uses RMA or VRMA for the guest. This moves the LPCR value into the kvm->arch struct and arranges for the MER (mediated external request) bit, which is the only bit that varies between vcpus, to be set in assembly code when going into the guest if there is a pending external interrupt request. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/include')
-rw-r--r--arch/powerpc/include/asm/kvm.h5
-rw-r--r--arch/powerpc/include/asm/kvm_book3s.h8
-rw-r--r--arch/powerpc/include/asm/kvm_host.h15
-rw-r--r--arch/powerpc/include/asm/kvm_ppc.h10
-rw-r--r--arch/powerpc/include/asm/reg.h1
5 files changed, 30 insertions, 9 deletions
diff --git a/arch/powerpc/include/asm/kvm.h b/arch/powerpc/include/asm/kvm.h
index 471bb3d..a4f6c85 100644
--- a/arch/powerpc/include/asm/kvm.h
+++ b/arch/powerpc/include/asm/kvm.h
@@ -282,4 +282,9 @@ struct kvm_create_spapr_tce {
__u32 window_size;
};
+/* for KVM_ALLOCATE_RMA */
+struct kvm_allocate_rma {
+ __u64 rma_size;
+};
+
#endif /* __LINUX_KVM_POWERPC_H */
diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h
index 5537c45..3f91ebd 100644
--- a/arch/powerpc/include/asm/kvm_book3s.h
+++ b/arch/powerpc/include/asm/kvm_book3s.h
@@ -298,14 +298,6 @@ static inline unsigned long kvmppc_interrupt_offset(struct kvm_vcpu *vcpu)
static inline void kvmppc_update_int_pending(struct kvm_vcpu *vcpu,
unsigned long pending_now, unsigned long old_pending)
{
- /* Recalculate LPCR:MER based on the presence of
- * a pending external interrupt
- */
- if (test_bit(BOOK3S_IRQPRIO_EXTERNAL, &pending_now) ||
- test_bit(BOOK3S_IRQPRIO_EXTERNAL_LEVEL, &pending_now))
- vcpu->arch.lpcr |= LPCR_MER;
- else
- vcpu->arch.lpcr &= ~((u64)LPCR_MER);
}
static inline void kvmppc_set_gpr(struct kvm_vcpu *vcpu, int num, ulong val)
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 0d6d569..f572d9c 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -28,6 +28,8 @@
#include <linux/threads.h>
#include <linux/spinlock.h>
#include <linux/kvm_para.h>
+#include <linux/list.h>
+#include <linux/atomic.h>
#include <asm/kvm_asm.h>
#include <asm/processor.h>
@@ -156,6 +158,14 @@ struct kvmppc_spapr_tce_table {
struct page *pages[0];
};
+struct kvmppc_rma_info {
+ void *base_virt;
+ unsigned long base_pfn;
+ unsigned long npages;
+ struct list_head list;
+ atomic_t use_count;
+};
+
struct kvm_arch {
#ifdef CONFIG_KVM_BOOK3S_64_HV
unsigned long hpt_virt;
@@ -169,6 +179,10 @@ struct kvm_arch {
unsigned long sdr1;
unsigned long host_sdr1;
int tlbie_lock;
+ int n_rma_pages;
+ unsigned long lpcr;
+ unsigned long rmor;
+ struct kvmppc_rma_info *rma;
struct list_head spapr_tce_tables;
unsigned short last_vcpu[NR_CPUS];
struct kvmppc_vcore *vcores[KVM_MAX_VCORES];
@@ -295,7 +309,6 @@ struct kvm_vcpu_arch {
ulong guest_owned_ext;
ulong purr;
ulong spurr;
- ulong lpcr;
ulong dscr;
ulong amr;
ulong uamor;
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 6ef7344..d121f49 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -124,6 +124,10 @@ extern void kvmppc_map_vrma(struct kvm *kvm,
extern int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu);
extern long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
struct kvm_create_spapr_tce *args);
+extern long kvm_vm_ioctl_allocate_rma(struct kvm *kvm,
+ struct kvm_allocate_rma *rma);
+extern struct kvmppc_rma_info *kvm_alloc_rma(void);
+extern void kvm_release_rma(struct kvmppc_rma_info *ri);
extern int kvmppc_core_init_vm(struct kvm *kvm);
extern void kvmppc_core_destroy_vm(struct kvm *kvm);
extern int kvmppc_core_prepare_memory_region(struct kvm *kvm,
@@ -177,9 +181,15 @@ static inline void kvmppc_set_xics_phys(int cpu, unsigned long addr)
{
paca[cpu].kvm_hstate.xics_phys = addr;
}
+
+extern void kvm_rma_init(void);
+
#else
static inline void kvmppc_set_xics_phys(int cpu, unsigned long addr)
{}
+
+static inline void kvm_rma_init(void)
+{}
#endif
#endif /* __POWERPC_KVM_PPC_H__ */
diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 36a611b..20a053c 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -242,6 +242,7 @@
#define LPCR_VRMA_LP1 (1ul << (63-16))
#define LPCR_VRMASD_SH (63-16)
#define LPCR_RMLS 0x1C000000 /* impl dependent rmo limit sel */
+#define LPCR_RMLS_SH (63-37)
#define LPCR_ILE 0x02000000 /* !HV irqs set MSR:LE */
#define LPCR_PECE 0x00007000 /* powersave exit cause enable */
#define LPCR_PECE0 0x00004000 /* ext. exceptions can cause exit */
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