提交 92234722 编写于 作者: A Alexander Graf 提交者: Avi Kivity

KVM: PPC: PV assembler helpers

When we hook an instruction we need to make sure we don't clobber any of
the registers at that point. So we write them out to scratch space in the
magic page. To make sure we don't fall into a race with another piece of
hooked code, we need to disable interrupts.

To make the later patches and code in general easier readable, let's introduce
a set of defines that save and restore r30, r31 and cr. Let's also define some
helpers to read the lower 32 bits of a 64 bit field on 32 bit systems.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Signed-off-by: NAvi Kivity <avi@redhat.com>
上级 71ee8e34
......@@ -34,3 +34,33 @@ kvm_hypercall_start:
blr
#define KVM_MAGIC_PAGE (-4096)
#ifdef CONFIG_64BIT
#define LL64(reg, offs, reg2) ld reg, (offs)(reg2)
#define STL64(reg, offs, reg2) std reg, (offs)(reg2)
#else
#define LL64(reg, offs, reg2) lwz reg, (offs + 4)(reg2)
#define STL64(reg, offs, reg2) stw reg, (offs + 4)(reg2)
#endif
#define SCRATCH_SAVE \
/* Enable critical section. We are critical if \
shared->critical == r1 */ \
STL64(r1, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0); \
\
/* Save state */ \
PPC_STL r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH1)(0); \
PPC_STL r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH2)(0); \
mfcr r31; \
stw r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH3)(0);
#define SCRATCH_RESTORE \
/* Restore state */ \
PPC_LL r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH1)(0); \
lwz r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH3)(0); \
mtcr r30; \
PPC_LL r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH2)(0); \
\
/* Disable critical section. We are critical if \
shared->critical == r1 and r2 is always != r1 */ \
STL64(r2, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0);
Markdown is supported
0% .
You are about to add 0 people to the discussion. Proceed with caution.
先完成此消息的编辑!
想要评论请 注册