/*
* access guest memory
*
- * Copyright IBM Corp. 2008, 2009
+ * Copyright IBM Corp. 2008, 2014
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (version 2 only)
#include <linux/compiler.h>
#include <linux/kvm_host.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
+#include <linux/ptrace.h>
#include "kvm-s390.h"
/* Convert real to absolute address by applying the prefix of the CPU */
return gaddr;
}
+/**
+ * kvm_s390_logical_to_effective - convert guest logical to effective address
+ * @vcpu: guest virtual cpu
+ * @ga: guest logical address
+ *
+ * Convert a guest vcpu logical address to a guest vcpu effective address by
+ * applying the rules of the vcpu's addressing mode defined by PSW bits 31
+ * and 32 (extendended/basic addressing mode).
+ *
+ * Depending on the vcpu's addressing mode the upper 40 bits (24 bit addressing
+ * mode), 33 bits (31 bit addressing mode) or no bits (64 bit addressing mode)
+ * of @ga will be zeroed and the remaining bits will be returned.
+ */
+static inline unsigned long kvm_s390_logical_to_effective(struct kvm_vcpu *vcpu,
+ unsigned long ga)
+{
+ psw_t *psw = &vcpu->arch.sie_block->gpsw;
+
+ if (psw_bits(*psw).eaba == PSW_AMODE_64BIT)
+ return ga;
+ if (psw_bits(*psw).eaba == PSW_AMODE_31BIT)
+ return ga & ((1UL << 31) - 1);
+ return ga & ((1UL << 24) - 1);
+}
+
static inline void __user *__gptr_to_uptr(struct kvm_vcpu *vcpu,
void __user *gptr,
int prefixing)
#define copy_from_guest_absolute(vcpu, to, from, size) \
__copy_guest(vcpu, (unsigned long)to, from, size, 0, 0)
+/*
+ * put_guest_lc, read_guest_lc and write_guest_lc are guest access functions
+ * which shall only be used to access the lowcore of a vcpu.
+ * These functions should be used for e.g. interrupt handlers where no
+ * guest memory access protection facilities, like key or low address
+ * protection, are applicable.
+ * At a later point guest vcpu lowcore access should happen via pinned
+ * prefix pages, so that these pages can be accessed directly via the
+ * kernel mapping. All of these *_lc functions can be removed then.
+ */
+
+/**
+ * put_guest_lc - write a simple variable to a guest vcpu's lowcore
+ * @vcpu: virtual cpu
+ * @x: value to copy to guest
+ * @gra: vcpu's destination guest real address
+ *
+ * Copies a simple value from kernel space to a guest vcpu's lowcore.
+ * The size of the variable may be 1, 2, 4 or 8 bytes. The destination
+ * must be located in the vcpu's lowcore. Otherwise the result is undefined.
+ *
+ * Returns zero on success or -EFAULT on error.
+ *
+ * Note: an error indicates that either the kernel is out of memory or
+ * the guest memory mapping is broken. In any case the best solution
+ * would be to terminate the guest.
+ * It is wrong to inject a guest exception.
+ */
+#define put_guest_lc(vcpu, x, gra) \
+({ \
+ struct kvm_vcpu *__vcpu = (vcpu); \
+ __typeof__(*(gra)) __x = (x); \
+ unsigned long __gpa; \
+ \
+ __gpa = (unsigned long)(gra); \
+ __gpa += __vcpu->arch.sie_block->prefix; \
+ kvm_write_guest(__vcpu->kvm, __gpa, &__x, sizeof(__x)); \
+})
+
+/**
+ * write_guest_lc - copy data from kernel space to guest vcpu's lowcore
+ * @vcpu: virtual cpu
+ * @gra: vcpu's source guest real address
+ * @data: source address in kernel space
+ * @len: number of bytes to copy
+ *
+ * Copy data from kernel space to guest vcpu's lowcore. The entire range must
+ * be located within the vcpu's lowcore, otherwise the result is undefined.
+ *
+ * Returns zero on success or -EFAULT on error.
+ *
+ * Note: an error indicates that either the kernel is out of memory or
+ * the guest memory mapping is broken. In any case the best solution
+ * would be to terminate the guest.
+ * It is wrong to inject a guest exception.
+ */
+static inline __must_check
+int write_guest_lc(struct kvm_vcpu *vcpu, unsigned long gra, void *data,
+ unsigned long len)
+{
+ unsigned long gpa = gra + vcpu->arch.sie_block->prefix;
+
+ return kvm_write_guest(vcpu->kvm, gpa, data, len);
+}
+
+/**
+ * read_guest_lc - copy data from guest vcpu's lowcore to kernel space
+ * @vcpu: virtual cpu
+ * @gra: vcpu's source guest real address
+ * @data: destination address in kernel space
+ * @len: number of bytes to copy
+ *
+ * Copy data from guest vcpu's lowcore to kernel space. The entire range must
+ * be located within the vcpu's lowcore, otherwise the result is undefined.
+ *
+ * Returns zero on success or -EFAULT on error.
+ *
+ * Note: an error indicates that either the kernel is out of memory or
+ * the guest memory mapping is broken. In any case the best solution
+ * would be to terminate the guest.
+ * It is wrong to inject a guest exception.
+ */
+static inline __must_check
+int read_guest_lc(struct kvm_vcpu *vcpu, unsigned long gra, void *data,
+ unsigned long len)
+{
+ unsigned long gpa = gra + vcpu->arch.sie_block->prefix;
+
+ return kvm_read_guest(vcpu->kvm, gpa, data, len);
+}
#endif /* __KVM_S390_GACCESS_H */
git.samba.org / sfrench / cifs-2.6.git / blobdiff