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Diffstat (limited to 'arch/x86/kvm/emulate.c')
-rw-r--r--arch/x86/kvm/emulate.c166
1 files changed, 35 insertions, 131 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 5e5de05a8fbf..2837110e66ed 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -22,7 +22,6 @@
#include "kvm_cache_regs.h"
#include "kvm_emulate.h"
#include <linux/stringify.h>
-#include <asm/fpu/api.h>
#include <asm/debugreg.h>
#include <asm/nospec-branch.h>
@@ -1081,116 +1080,14 @@ static void fetch_register_operand(struct operand *op)
}
}
-static void emulator_get_fpu(void)
-{
- fpregs_lock();
-
- fpregs_assert_state_consistent();
- if (test_thread_flag(TIF_NEED_FPU_LOAD))
- switch_fpu_return();
-}
-
-static void emulator_put_fpu(void)
-{
- fpregs_unlock();
-}
-
-static void read_sse_reg(sse128_t *data, int reg)
-{
- emulator_get_fpu();
- switch (reg) {
- case 0: asm("movdqa %%xmm0, %0" : "=m"(*data)); break;
- case 1: asm("movdqa %%xmm1, %0" : "=m"(*data)); break;
- case 2: asm("movdqa %%xmm2, %0" : "=m"(*data)); break;
- case 3: asm("movdqa %%xmm3, %0" : "=m"(*data)); break;
- case 4: asm("movdqa %%xmm4, %0" : "=m"(*data)); break;
- case 5: asm("movdqa %%xmm5, %0" : "=m"(*data)); break;
- case 6: asm("movdqa %%xmm6, %0" : "=m"(*data)); break;
- case 7: asm("movdqa %%xmm7, %0" : "=m"(*data)); break;
-#ifdef CONFIG_X86_64
- case 8: asm("movdqa %%xmm8, %0" : "=m"(*data)); break;
- case 9: asm("movdqa %%xmm9, %0" : "=m"(*data)); break;
- case 10: asm("movdqa %%xmm10, %0" : "=m"(*data)); break;
- case 11: asm("movdqa %%xmm11, %0" : "=m"(*data)); break;
- case 12: asm("movdqa %%xmm12, %0" : "=m"(*data)); break;
- case 13: asm("movdqa %%xmm13, %0" : "=m"(*data)); break;
- case 14: asm("movdqa %%xmm14, %0" : "=m"(*data)); break;
- case 15: asm("movdqa %%xmm15, %0" : "=m"(*data)); break;
-#endif
- default: BUG();
- }
- emulator_put_fpu();
-}
-
-static void write_sse_reg(sse128_t *data, int reg)
-{
- emulator_get_fpu();
- switch (reg) {
- case 0: asm("movdqa %0, %%xmm0" : : "m"(*data)); break;
- case 1: asm("movdqa %0, %%xmm1" : : "m"(*data)); break;
- case 2: asm("movdqa %0, %%xmm2" : : "m"(*data)); break;
- case 3: asm("movdqa %0, %%xmm3" : : "m"(*data)); break;
- case 4: asm("movdqa %0, %%xmm4" : : "m"(*data)); break;
- case 5: asm("movdqa %0, %%xmm5" : : "m"(*data)); break;
- case 6: asm("movdqa %0, %%xmm6" : : "m"(*data)); break;
- case 7: asm("movdqa %0, %%xmm7" : : "m"(*data)); break;
-#ifdef CONFIG_X86_64
- case 8: asm("movdqa %0, %%xmm8" : : "m"(*data)); break;
- case 9: asm("movdqa %0, %%xmm9" : : "m"(*data)); break;
- case 10: asm("movdqa %0, %%xmm10" : : "m"(*data)); break;
- case 11: asm("movdqa %0, %%xmm11" : : "m"(*data)); break;
- case 12: asm("movdqa %0, %%xmm12" : : "m"(*data)); break;
- case 13: asm("movdqa %0, %%xmm13" : : "m"(*data)); break;
- case 14: asm("movdqa %0, %%xmm14" : : "m"(*data)); break;
- case 15: asm("movdqa %0, %%xmm15" : : "m"(*data)); break;
-#endif
- default: BUG();
- }
- emulator_put_fpu();
-}
-
-static void read_mmx_reg(u64 *data, int reg)
-{
- emulator_get_fpu();
- switch (reg) {
- case 0: asm("movq %%mm0, %0" : "=m"(*data)); break;
- case 1: asm("movq %%mm1, %0" : "=m"(*data)); break;
- case 2: asm("movq %%mm2, %0" : "=m"(*data)); break;
- case 3: asm("movq %%mm3, %0" : "=m"(*data)); break;
- case 4: asm("movq %%mm4, %0" : "=m"(*data)); break;
- case 5: asm("movq %%mm5, %0" : "=m"(*data)); break;
- case 6: asm("movq %%mm6, %0" : "=m"(*data)); break;
- case 7: asm("movq %%mm7, %0" : "=m"(*data)); break;
- default: BUG();
- }
- emulator_put_fpu();
-}
-
-static void write_mmx_reg(u64 *data, int reg)
-{
- emulator_get_fpu();
- switch (reg) {
- case 0: asm("movq %0, %%mm0" : : "m"(*data)); break;
- case 1: asm("movq %0, %%mm1" : : "m"(*data)); break;
- case 2: asm("movq %0, %%mm2" : : "m"(*data)); break;
- case 3: asm("movq %0, %%mm3" : : "m"(*data)); break;
- case 4: asm("movq %0, %%mm4" : : "m"(*data)); break;
- case 5: asm("movq %0, %%mm5" : : "m"(*data)); break;
- case 6: asm("movq %0, %%mm6" : : "m"(*data)); break;
- case 7: asm("movq %0, %%mm7" : : "m"(*data)); break;
- default: BUG();
- }
- emulator_put_fpu();
-}
-
static int em_fninit(struct x86_emulate_ctxt *ctxt)
{
if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
return emulate_nm(ctxt);
- emulator_get_fpu();
+ kvm_fpu_get();
asm volatile("fninit");
- emulator_put_fpu();
+ kvm_fpu_put();
return X86EMUL_CONTINUE;
}
@@ -1201,9 +1098,9 @@ static int em_fnstcw(struct x86_emulate_ctxt *ctxt)
if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
return emulate_nm(ctxt);
- emulator_get_fpu();
+ kvm_fpu_get();
asm volatile("fnstcw %0": "+m"(fcw));
- emulator_put_fpu();
+ kvm_fpu_put();
ctxt->dst.val = fcw;
@@ -1217,9 +1114,9 @@ static int em_fnstsw(struct x86_emulate_ctxt *ctxt)
if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
return emulate_nm(ctxt);
- emulator_get_fpu();
+ kvm_fpu_get();
asm volatile("fnstsw %0": "+m"(fsw));
- emulator_put_fpu();
+ kvm_fpu_put();
ctxt->dst.val = fsw;
@@ -1238,7 +1135,7 @@ static void decode_register_operand(struct x86_emulate_ctxt *ctxt,
op->type = OP_XMM;
op->bytes = 16;
op->addr.xmm = reg;
- read_sse_reg(&op->vec_val, reg);
+ kvm_read_sse_reg(reg, &op->vec_val);
return;
}
if (ctxt->d & Mmx) {
@@ -1289,7 +1186,7 @@ static int decode_modrm(struct x86_emulate_ctxt *ctxt,
op->type = OP_XMM;
op->bytes = 16;
op->addr.xmm = ctxt->modrm_rm;
- read_sse_reg(&op->vec_val, ctxt->modrm_rm);
+ kvm_read_sse_reg(ctxt->modrm_rm, &op->vec_val);
return rc;
}
if (ctxt->d & Mmx) {
@@ -1866,10 +1763,10 @@ static int writeback(struct x86_emulate_ctxt *ctxt, struct operand *op)
op->bytes * op->count);
break;
case OP_XMM:
- write_sse_reg(&op->vec_val, op->addr.xmm);
+ kvm_write_sse_reg(op->addr.xmm, &op->vec_val);
break;
case OP_MM:
- write_mmx_reg(&op->mm_val, op->addr.mm);
+ kvm_write_mmx_reg(op->addr.mm, &op->mm_val);
break;
case OP_NONE:
/* no writeback */
@@ -2638,8 +2535,7 @@ static int em_rsm(struct x86_emulate_ctxt *ctxt)
if ((ctxt->ops->get_hflags(ctxt) & X86EMUL_SMM_INSIDE_NMI_MASK) == 0)
ctxt->ops->set_nmi_mask(ctxt, false);
- ctxt->ops->set_hflags(ctxt, ctxt->ops->get_hflags(ctxt) &
- ~(X86EMUL_SMM_INSIDE_NMI_MASK | X86EMUL_SMM_MASK));
+ ctxt->ops->exiting_smm(ctxt);
/*
* Get back to real mode, to prepare a safe state in which to load
@@ -2678,12 +2574,12 @@ static int em_rsm(struct x86_emulate_ctxt *ctxt)
}
/*
- * Give pre_leave_smm() a chance to make ISA-specific changes to the
- * vCPU state (e.g. enter guest mode) before loading state from the SMM
+ * Give leave_smm() a chance to make ISA-specific changes to the vCPU
+ * state (e.g. enter guest mode) before loading state from the SMM
* state-save area.
*/
- if (ctxt->ops->pre_leave_smm(ctxt, buf))
- return X86EMUL_UNHANDLEABLE;
+ if (ctxt->ops->leave_smm(ctxt, buf))
+ goto emulate_shutdown;
#ifdef CONFIG_X86_64
if (emulator_has_longmode(ctxt))
@@ -2692,13 +2588,21 @@ static int em_rsm(struct x86_emulate_ctxt *ctxt)
#endif
ret = rsm_load_state_32(ctxt, buf);
- if (ret != X86EMUL_CONTINUE) {
- /* FIXME: should triple fault */
- return X86EMUL_UNHANDLEABLE;
- }
+ if (ret != X86EMUL_CONTINUE)
+ goto emulate_shutdown;
- ctxt->ops->post_leave_smm(ctxt);
+ /*
+ * Note, the ctxt->ops callbacks are responsible for handling side
+ * effects when writing MSRs and CRs, e.g. MMU context resets, CPUID
+ * runtime updates, etc... If that changes, e.g. this flow is moved
+ * out of the emulator to make it look more like enter_smm(), then
+ * those side effects need to be explicitly handled for both success
+ * and shutdown.
+ */
+ return X86EMUL_CONTINUE;
+emulate_shutdown:
+ ctxt->ops->triple_fault(ctxt);
return X86EMUL_CONTINUE;
}
@@ -4124,11 +4028,11 @@ static int em_fxsave(struct x86_emulate_ctxt *ctxt)
if (rc != X86EMUL_CONTINUE)
return rc;
- emulator_get_fpu();
+ kvm_fpu_get();
rc = asm_safe("fxsave %[fx]", , [fx] "+m"(fx_state));
- emulator_put_fpu();
+ kvm_fpu_put();
if (rc != X86EMUL_CONTINUE)
return rc;
@@ -4172,7 +4076,7 @@ static int em_fxrstor(struct x86_emulate_ctxt *ctxt)
if (rc != X86EMUL_CONTINUE)
return rc;
- emulator_get_fpu();
+ kvm_fpu_get();
if (size < __fxstate_size(16)) {
rc = fxregs_fixup(&fx_state, size);
@@ -4189,7 +4093,7 @@ static int em_fxrstor(struct x86_emulate_ctxt *ctxt)
rc = asm_safe("fxrstor %[fx]", : [fx] "m"(fx_state));
out:
- emulator_put_fpu();
+ kvm_fpu_put();
return rc;
}
@@ -5437,9 +5341,9 @@ static int flush_pending_x87_faults(struct x86_emulate_ctxt *ctxt)
{
int rc;
- emulator_get_fpu();
+ kvm_fpu_get();
rc = asm_safe("fwait");
- emulator_put_fpu();
+ kvm_fpu_put();
if (unlikely(rc != X86EMUL_CONTINUE))
return emulate_exception(ctxt, MF_VECTOR, 0, false);
@@ -5450,7 +5354,7 @@ static int flush_pending_x87_faults(struct x86_emulate_ctxt *ctxt)
static void fetch_possible_mmx_operand(struct operand *op)
{
if (op->type == OP_MM)
- read_mmx_reg(&op->mm_val, op->addr.mm);
+ kvm_read_mmx_reg(op->addr.mm, &op->mm_val);
}
static int fastop(struct x86_emulate_ctxt *ctxt, fastop_t fop)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-28 02:55:41 +0000