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HV:treewide: Add exec_vmread16 and exec_vmwrite16 functions

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In the hypervisor, VMCS fields include 16-bit fields,
32-bit fields, 64-bit fields and natural-width fields.
In the current implement, no exec_vmread16/exec_vmwrite16
is for accessing 16-bit fields. So there are many type
casting for the return value and parameters vmread/vmwrite
operations.

Create exec_vmread16 and exec_vmwrite16 functions to
access 16-bit fields in VMCS;
Update related variables type for vmread/vmwrite operations;
Update related caller according to VMCS fields size.

V1--V2:
	This is new part of this patch serial to only
	update 16-bit vmread/vmread opertions and related
	caller.
V2--V3:
	Add "hu" for uint16_t argument in log function;
	Add comments for function get_vmcs_field;
	Update related variables type for exec_vmread16;
	Rename temp variable 'low' into 'value'.
V3-->V4:
	Few updates for exec_vmread16.
V4-->V5:
	Few updates for coding style;
	Replace "hux" with "hu" in log function for 16-bit
	variable.
V5-->V6:
	CPU_REG_64BIT_LAST is used in the vm_get_register and
	vm_set_register to make condition statement more
	understandable.

Signed-off-by: Xiangyang Wu <xiangyang.wu@intel.com>
Reviewed-by: Junjie Mao <junjie.mao@intel.com>
This commit is contained in:
Xiangyang Wu
2018-07-16 15:21:44 +08:00
committed by lijinxia
parent d3b9712438
commit 65437960a9
8 changed files with 83 additions and 45 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
hypervisor/common/hypercall.c
View File

@@ -14,11 +14,11 @@
bool is_hypercall_from_ring0(void)
{
uint64_t cs_sel;
uint16_t cs_sel;
cs_sel = exec_vmread(VMX_GUEST_CS_SEL);
cs_sel = exec_vmread16(VMX_GUEST_CS_SEL);
/* cs_selector[1:0] is CPL */
if ((cs_sel & 0x3UL) == 0) {
if ((cs_sel & 0x3U) == 0U) {
return true;
}