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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen stable-4.6] x86emul: honor guest CR0.TS and CR0.EM
commit 4b41252d00f1caf25a9811580a9b344db3c03708
Author: Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Oct 4 14:05:41 2016 +0100
Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Tue Oct 4 14:05:41 2016 +0100
x86emul: honor guest CR0.TS and CR0.EM
We must not emulate any instructions accessing respective registers
when either of these flags is set in the guest view of the register, or
else we may do so on data not belonging to the guest's current task.
Being architecturally required behavior, the logic gets placed in the
instruction emulator instead of hvmemul_get_fpu(). It should be noted,
though, that hvmemul_get_fpu() being the only current handler for the
get_fpu() callback, we don't have an active problem with CR4: Both
CR4.OSFXSR and CR4.OSXSAVE get handled as necessary by that function.
This is XSA-190.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
tools/tests/x86_emulator/test_x86_emulator.c | 17 +++++++++
xen/arch/x86/hvm/emulate.c | 2 +-
xen/arch/x86/x86_emulate/x86_emulate.c | 53 +++++++++++++++++++++++++---
xen/arch/x86/x86_emulate/x86_emulate.h | 1 +
4 files changed, 68 insertions(+), 5 deletions(-)
diff --git a/tools/tests/x86_emulator/test_x86_emulator.c
b/tools/tests/x86_emulator/test_x86_emulator.c
index 1b78bf7..65c4c97 100644
--- a/tools/tests/x86_emulator/test_x86_emulator.c
+++ b/tools/tests/x86_emulator/test_x86_emulator.c
@@ -129,6 +129,22 @@ static inline uint64_t xgetbv(uint32_t xcr)
(ebx & (1U << 5)) != 0; \
})
+static int read_cr(
+ unsigned int reg,
+ unsigned long *val,
+ struct x86_emulate_ctxt *ctxt)
+{
+ /* Fake just enough state for the emulator's _get_fpu() to be happy. */
+ switch ( reg )
+ {
+ case 0:
+ *val = 0x00000001; /* PE */
+ return X86EMUL_OKAY;
+ }
+
+ return X86EMUL_UNHANDLEABLE;
+}
+
int get_fpu(
void (*exception_callback)(void *, struct cpu_user_regs *),
void *exception_callback_arg,
@@ -160,6 +176,7 @@ static struct x86_emulate_ops emulops = {
.write = write,
.cmpxchg = cmpxchg,
.cpuid = cpuid,
+ .read_cr = read_cr,
.get_fpu = get_fpu,
};
diff --git a/xen/arch/x86/hvm/emulate.c b/xen/arch/x86/hvm/emulate.c
index 771cb45..e36eefc 100644
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -1557,6 +1557,7 @@ static int hvmemul_get_fpu(
switch ( type )
{
case X86EMUL_FPU_fpu:
+ case X86EMUL_FPU_wait:
break;
case X86EMUL_FPU_mmx:
if ( !cpu_has_mmx )
@@ -1564,7 +1565,6 @@ static int hvmemul_get_fpu(
break;
case X86EMUL_FPU_xmm:
if ( !cpu_has_xmm ||
- (curr->arch.hvm_vcpu.guest_cr[0] & X86_CR0_EM) ||
!(curr->arch.hvm_vcpu.guest_cr[4] & X86_CR4_OSFXSR) )
return X86EMUL_UNHANDLEABLE;
break;
diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c
b/xen/arch/x86/x86_emulate/x86_emulate.c
index 123f4da..5f6be53 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -366,6 +366,9 @@ typedef union {
/* Control register flags. */
#define CR0_PE (1<<0)
+#define CR0_MP (1<<1)
+#define CR0_EM (1<<2)
+#define CR0_TS (1<<3)
#define CR4_TSD (1<<2)
/* EFLAGS bit definitions. */
@@ -393,6 +396,7 @@ typedef union {
#define EXC_OF 4
#define EXC_BR 5
#define EXC_UD 6
+#define EXC_NM 7
#define EXC_TS 10
#define EXC_NP 11
#define EXC_SS 12
@@ -674,10 +678,45 @@ static void fpu_handle_exception(void *_fic, struct
cpu_user_regs *regs)
regs->eip += fic->insn_bytes;
}
+static int _get_fpu(
+ enum x86_emulate_fpu_type type,
+ struct fpu_insn_ctxt *fic,
+ struct x86_emulate_ctxt *ctxt,
+ const struct x86_emulate_ops *ops)
+{
+ int rc;
+
+ fic->exn_raised = 0;
+
+ fail_if(!ops->get_fpu);
+ rc = ops->get_fpu(fpu_handle_exception, fic, type, ctxt);
+
+ if ( rc == X86EMUL_OKAY )
+ {
+ unsigned long cr0;
+
+ fail_if(!ops->read_cr);
+ rc = ops->read_cr(0, &cr0, ctxt);
+ if ( rc != X86EMUL_OKAY )
+ return rc;
+ if ( cr0 & CR0_EM )
+ {
+ generate_exception_if(type == X86EMUL_FPU_fpu, EXC_NM, -1);
+ generate_exception_if(type == X86EMUL_FPU_mmx, EXC_UD, -1);
+ generate_exception_if(type == X86EMUL_FPU_xmm, EXC_UD, -1);
+ }
+ generate_exception_if((cr0 & CR0_TS) &&
+ (type != X86EMUL_FPU_wait || (cr0 & CR0_MP)),
+ EXC_NM, -1);
+ }
+
+ done:
+ return rc;
+}
+
#define get_fpu(_type, _fic) \
-do{ (_fic)->exn_raised = 0; \
- fail_if(ops->get_fpu == NULL); \
- rc = ops->get_fpu(fpu_handle_exception, _fic, _type, ctxt); \
+do { \
+ rc = _get_fpu(_type, _fic, ctxt, ops); \
if ( rc ) goto done; \
} while (0)
#define _put_fpu() \
@@ -2508,8 +2547,14 @@ x86_emulate(
}
case 0x9b: /* wait/fwait */
- emulate_fpu_insn("fwait");
+ {
+ struct fpu_insn_ctxt fic = { .insn_bytes = 1 };
+
+ get_fpu(X86EMUL_FPU_wait, &fic);
+ asm volatile ( "fwait" ::: "memory" );
+ put_fpu(&fic);
break;
+ }
case 0x9c: /* pushf */
src.val = _regs.eflags;
diff --git a/xen/arch/x86/x86_emulate/x86_emulate.h
b/xen/arch/x86/x86_emulate/x86_emulate.h
index 9e4bca9..ad2f7e9 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.h
+++ b/xen/arch/x86/x86_emulate/x86_emulate.h
@@ -115,6 +115,7 @@ struct __packed segment_register {
/* FPU sub-types which may be requested via ->get_fpu(). */
enum x86_emulate_fpu_type {
X86EMUL_FPU_fpu, /* Standard FPU coprocessor instruction set */
+ X86EMUL_FPU_wait, /* WAIT/FWAIT instruction */
X86EMUL_FPU_mmx, /* MMX instruction set (%mm0-%mm7) */
X86EMUL_FPU_xmm, /* SSE instruction set (%xmm0-%xmm7/15) */
X86EMUL_FPU_ymm /* AVX/XOP instruction set (%ymm0-%ymm7/15) */
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.6
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