hv: avoid hardcode cs.limit in set_vcpu_regs()
For SOS BSP, we reuse native saved cs.limit For UOS BSP, we set cs.limit in DM For AP, we use initialized data from realmode_init_regs. Tracked-On: #1231 Signed-off-by: Yin Fengwei <fengwei.yin@intel.com> Acked-by: Eddie Dong <Eddie.dong@intel.com>
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@ -189,16 +189,17 @@ void set_vcpu_regs(struct vcpu *vcpu, struct acrn_vcpu_regs *vcpu_regs)
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ectx = &(vcpu->arch_vcpu.contexts[vcpu->arch_vcpu.cur_context].ext_ctx);
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ctx = &(vcpu->arch_vcpu.contexts[vcpu->arch_vcpu.cur_context].run_ctx);
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if (vcpu_regs->cs_ar & (1U << 15U)) {
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limit = 0xFFFFFFFFU;
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} else {
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limit = 0xFFFFU;
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}
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/* NOTE:
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* This is to set the attr and limit to default value.
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* If the set_vcpu_regs is used not only for vcpu state
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* initialization, this part of code needs be revised.
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*/
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if (vcpu_regs->cr0 & CR0_PE) {
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attr = PROTECTED_MODE_DATA_SEG_AR;
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limit = PROTECTED_MODE_SEG_LIMIT;
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} else {
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attr = REAL_MODE_DATA_SEG_AR;
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limit = REAL_MODE_SEG_LIMIT;
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}
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for (seg = &(ectx->cs); seg <= &(ectx->gs); seg++) {
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@ -209,9 +210,10 @@ void set_vcpu_regs(struct vcpu *vcpu, struct acrn_vcpu_regs *vcpu_regs)
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sel++;
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}
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/* override cs attr/base */
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/* override cs attr/base/limit */
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ectx->cs.attr = vcpu_regs->cs_ar;
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ectx->cs.base = vcpu_regs->cs_base;
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ectx->cs.limit = vcpu_regs->cs_limit;
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ectx->gdtr.base = vcpu_regs->gdt.base;
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ectx->gdtr.limit = vcpu_regs->gdt.limit;
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@ -271,6 +273,7 @@ static struct acrn_vcpu_regs realmode_init_regs = {
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.cs_ar = REAL_MODE_CODE_SEG_AR,
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.cs_sel = REAL_MODE_BSP_INIT_CODE_SEL,
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.cs_base = 0xFFFF0000UL,
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.cs_limit = 0xFFFFU,
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.rip = 0xFFF0UL,
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.cr0 = CR0_ET | CR0_NE,
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.cr3 = 0UL,
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@ -69,6 +69,8 @@
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#define REAL_MODE_CODE_SEG_AR (0x009fU)
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#define PROTECTED_MODE_DATA_SEG_AR (0xc093U)
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#define PROTECTED_MODE_CODE_SEG_AR (0xc09bU)
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#define REAL_MODE_SEG_LIMIT (0xffffU)
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#define PROTECTED_MODE_SEG_LIMIT (0xffffffffU)
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#define DR7_INIT_VALUE (0x400UL)
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#define LDTR_AR (0x0082U) /* LDT, type must be 2, refer to SDM Vol3 26.3.1.2 */
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#define TR_AR (0x008bU) /* TSS (busy), refer to SDM Vol3 26.3.1.2 */
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