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vcpu: add get/set register APIs

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there will be 3 types of vcpu runtime contexts:
- runtime contexts always saved/restored during VM exit/entry, which
  include general registers rax/rcx/rdx/rbx/rbp/rsi/rdi/r8~r15, cr2 and
  msr for spectre control (ia32_spec_ctrl)
- runtime contexts on-demand cached/updated during VM exit/entry, which
  include frequently used registers rsp, rip, efer, rflags, cr0 and cr4
- runtime contexts always read/write from/to VMCS, which include left
  registers not in above

this patch add get/set register APIs for vcpu runtime contexts, and unified
the save/restore method for them according to above description.

v3:
- update vcpu_get/set_cr0/4 as unified interface to get/set guest cr0/cr4,
  use on-demand cache for reading, but always write to VMCS for writing.

v2:
- use reg_cached/reg_updated for on-demand runtime contexts
- always read/write cr3 from/to VMCS

Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Jason Chen CJ
2018-07-26 14:56:47 +08:00
committed by lijinxia
parent 5aa1ad3bfc
commit 3d5d6c96ec
20 changed files with 408 additions and 325 deletions
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15
hypervisor/arch/x86/io.c
View File

@@ -29,13 +29,10 @@ emulate_pio_post(struct vcpu *vcpu, struct io_request *io_req)
if (pio_req->direction == REQUEST_READ) {
uint64_t value = (uint64_t)pio_req->value;
int32_t context_idx = vcpu->arch_vcpu.cur_context;
struct run_context *cur_context;
uint64_t *rax;
uint64_t rax = vcpu_get_gpreg(vcpu, CPU_REG_RAX);
cur_context = &vcpu->arch_vcpu.contexts[context_idx];
rax = &cur_context->guest_cpu_regs.regs.rax;
*rax = ((*rax) & ~mask) | (value & mask);
rax = ((rax) & ~mask) | (value & mask);
vcpu_set_gpreg(vcpu, CPU_REG_RAX, rax);
}
status = 0;
} else {
@@ -323,14 +320,10 @@ int32_t pio_instr_vmexit_handler(struct vcpu *vcpu)
int32_t status;
uint64_t exit_qual;
int32_t cur_context_idx = vcpu->arch_vcpu.cur_context;
struct run_context *cur_context;
struct cpu_gp_regs *regs;
struct io_request *io_req = &vcpu->req;
struct pio_request *pio_req = &io_req->reqs.pio;
exit_qual = vcpu->arch_vcpu.exit_qualification;
cur_context = &vcpu->arch_vcpu.contexts[cur_context_idx];
regs = &cur_context->guest_cpu_regs.regs;
io_req->type = REQ_PORTIO;
io_req->processed = REQ_STATE_PENDING;
@@ -338,7 +331,7 @@ int32_t pio_instr_vmexit_handler(struct vcpu *vcpu)
pio_req->address = VM_EXIT_IO_INSTRUCTION_PORT_NUMBER(exit_qual);
if (VM_EXIT_IO_INSTRUCTION_ACCESS_DIRECTION(exit_qual) == 0UL) {
pio_req->direction = REQUEST_WRITE;
pio_req->value = (uint32_t)regs->rax;
pio_req->value = (uint32_t)vcpu_get_gpreg(vcpu, CPU_REG_RAX);
} else {
pio_req->direction = REQUEST_READ;
}