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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 04/20] PVH xen: add params to read_segment_register
In this patch, read_segment_register macro is changed to take vcpu and
regs parameters so it can check if it's PVH guest (change in upcoming
patches). No functionality change. Also, make emulate_privileged_op()
public for later while changing this file.
Changes in V2: None
Changes in V3:
- Replace read_sreg with read_segment_register
Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
---
xen/arch/x86/domain.c | 8 ++++----
xen/arch/x86/traps.c | 28 +++++++++++++---------------
xen/arch/x86/x86_64/traps.c | 16 ++++++++--------
xen/include/asm-x86/system.h | 2 +-
xen/include/asm-x86/traps.h | 1 +
5 files changed, 27 insertions(+), 28 deletions(-)
diff --git a/xen/arch/x86/domain.c b/xen/arch/x86/domain.c
index 65e14da..b9711d2 100644
--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -1347,10 +1347,10 @@ static void save_segments(struct vcpu *v)
struct cpu_user_regs *regs = &v->arch.user_regs;
unsigned int dirty_segment_mask = 0;
- regs->ds = read_segment_register(ds);
- regs->es = read_segment_register(es);
- regs->fs = read_segment_register(fs);
- regs->gs = read_segment_register(gs);
+ regs->ds = read_segment_register(v, regs, ds);
+ regs->es = read_segment_register(v, regs, es);
+ regs->fs = read_segment_register(v, regs, fs);
+ regs->gs = read_segment_register(v, regs, gs);
if ( regs->ds )
dirty_segment_mask |= DIRTY_DS;
diff --git a/xen/arch/x86/traps.c b/xen/arch/x86/traps.c
index fbbe31d..1b280dc 100644
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -1823,8 +1823,6 @@ static inline uint64_t guest_misc_enable(uint64_t val)
} \
(eip) += sizeof(_x); _x; })
-#define read_sreg(regs, sr) read_segment_register(sr)
-
static int is_cpufreq_controller(struct domain *d)
{
return ((cpufreq_controller == FREQCTL_dom0_kernel) &&
@@ -1833,7 +1831,7 @@ static int is_cpufreq_controller(struct domain *d)
#include "x86_64/mmconfig.h"
-static int emulate_privileged_op(struct cpu_user_regs *regs)
+int emulate_privileged_op(struct cpu_user_regs *regs)
{
struct vcpu *v = current;
unsigned long *reg, eip = regs->eip;
@@ -1869,7 +1867,7 @@ static int emulate_privileged_op(struct cpu_user_regs
*regs)
goto fail;
/* emulating only opcodes not allowing SS to be default */
- data_sel = read_sreg(regs, ds);
+ data_sel = read_segment_register(v, regs, ds);
/* Legacy prefixes. */
for ( i = 0; i < 8; i++, rex == opcode || (rex = 0) )
@@ -1887,17 +1885,17 @@ static int emulate_privileged_op(struct cpu_user_regs
*regs)
data_sel = regs->cs;
continue;
case 0x3e: /* DS override */
- data_sel = read_sreg(regs, ds);
+ data_sel = read_segment_register(v, regs, ds);
continue;
case 0x26: /* ES override */
- data_sel = read_sreg(regs, es);
+ data_sel = read_segment_register(v, regs, es);
continue;
case 0x64: /* FS override */
- data_sel = read_sreg(regs, fs);
+ data_sel = read_segment_register(v, regs, fs);
lm_ovr = lm_seg_fs;
continue;
case 0x65: /* GS override */
- data_sel = read_sreg(regs, gs);
+ data_sel = read_segment_register(v, regs, gs);
lm_ovr = lm_seg_gs;
continue;
case 0x36: /* SS override */
@@ -1944,7 +1942,7 @@ static int emulate_privileged_op(struct cpu_user_regs
*regs)
if ( !(opcode & 2) )
{
- data_sel = read_sreg(regs, es);
+ data_sel = read_segment_register(v, regs, es);
lm_ovr = lm_seg_none;
}
@@ -2688,22 +2686,22 @@ static void emulate_gate_op(struct cpu_user_regs *regs)
ASSERT(opnd_sel);
continue;
case 0x3e: /* DS override */
- opnd_sel = read_sreg(regs, ds);
+ opnd_sel = read_segment_register(v, regs, ds);
if ( !opnd_sel )
opnd_sel = dpl;
continue;
case 0x26: /* ES override */
- opnd_sel = read_sreg(regs, es);
+ opnd_sel = read_segment_register(v, regs, es);
if ( !opnd_sel )
opnd_sel = dpl;
continue;
case 0x64: /* FS override */
- opnd_sel = read_sreg(regs, fs);
+ opnd_sel = read_segment_register(v, regs, fs);
if ( !opnd_sel )
opnd_sel = dpl;
continue;
case 0x65: /* GS override */
- opnd_sel = read_sreg(regs, gs);
+ opnd_sel = read_segment_register(v, regs, gs);
if ( !opnd_sel )
opnd_sel = dpl;
continue;
@@ -2756,7 +2754,7 @@ static void emulate_gate_op(struct cpu_user_regs *regs)
switch ( modrm & 7 )
{
default:
- opnd_sel = read_sreg(regs, ds);
+ opnd_sel = read_segment_register(v, regs, ds);
break;
case 4: case 5:
opnd_sel = regs->ss;
@@ -2784,7 +2782,7 @@ static void emulate_gate_op(struct cpu_user_regs *regs)
break;
}
if ( !opnd_sel )
- opnd_sel = read_sreg(regs, ds);
+ opnd_sel = read_segment_register(v, regs, ds);
switch ( modrm & 7 )
{
case 0: case 2: case 4:
diff --git a/xen/arch/x86/x86_64/traps.c b/xen/arch/x86/x86_64/traps.c
index eec919a..d2f7209 100644
--- a/xen/arch/x86/x86_64/traps.c
+++ b/xen/arch/x86/x86_64/traps.c
@@ -122,10 +122,10 @@ void show_registers(struct cpu_user_regs *regs)
fault_crs[0] = read_cr0();
fault_crs[3] = read_cr3();
fault_crs[4] = read_cr4();
- fault_regs.ds = read_segment_register(ds);
- fault_regs.es = read_segment_register(es);
- fault_regs.fs = read_segment_register(fs);
- fault_regs.gs = read_segment_register(gs);
+ fault_regs.ds = read_segment_register(v, regs, ds);
+ fault_regs.es = read_segment_register(v, regs, es);
+ fault_regs.fs = read_segment_register(v, regs, fs);
+ fault_regs.gs = read_segment_register(v, regs, gs);
}
print_xen_info();
@@ -240,10 +240,10 @@ void do_double_fault(struct cpu_user_regs *regs)
crs[2] = read_cr2();
crs[3] = read_cr3();
crs[4] = read_cr4();
- regs->ds = read_segment_register(ds);
- regs->es = read_segment_register(es);
- regs->fs = read_segment_register(fs);
- regs->gs = read_segment_register(gs);
+ regs->ds = read_segment_register(current, regs, ds);
+ regs->es = read_segment_register(current, regs, es);
+ regs->fs = read_segment_register(current, regs, fs);
+ regs->gs = read_segment_register(current, regs, gs);
printk("CPU: %d\n", cpu);
_show_registers(regs, crs, CTXT_hypervisor, NULL);
diff --git a/xen/include/asm-x86/system.h b/xen/include/asm-x86/system.h
index b0876d6..d8dc6f2 100644
--- a/xen/include/asm-x86/system.h
+++ b/xen/include/asm-x86/system.h
@@ -4,7 +4,7 @@
#include <xen/lib.h>
#include <asm/bitops.h>
-#define read_segment_register(name) \
+#define read_segment_register(vcpu, regs, name) \
({ u16 __sel; \
asm volatile ( "movw %%" STR(name) ",%0" : "=r" (__sel) ); \
__sel; \
diff --git a/xen/include/asm-x86/traps.h b/xen/include/asm-x86/traps.h
index 82cbcee..202e3be 100644
--- a/xen/include/asm-x86/traps.h
+++ b/xen/include/asm-x86/traps.h
@@ -49,4 +49,5 @@ extern int guest_has_trap_callback(struct domain *d, uint16_t
vcpuid,
extern int send_guest_trap(struct domain *d, uint16_t vcpuid,
unsigned int trap_nr);
+int emulate_privileged_op(struct cpu_user_regs *regs);
#endif /* ASM_TRAP_H */
--
1.7.2.3
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