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hv: TLFS: Setup hypercall page according to the vcpu mode 

TLFS spec defines different hypercall ABIs for X86 and x64. Currently
x64 hypercall interface is not supported well.

Setup the hypercall interface page according to the vcpu mode.

Tracked-On: #5956
Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com>
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Jian Jun Chen 2019-12-20 08:40:41 +08:00 committed by wenlingz
parent 6d5759a260
commit dd524d076d
1 changed files with 22 additions and 3 deletions
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25
hypervisor/arch/x86/guest/hyperv.c
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@ -136,8 +136,23 @@ hyperv_setup_hypercall_page(const struct acrn_vcpu *vcpu, uint64_t val)
uint64_t page_gpa;
void *page_hva;
/* asm volatile ("mov $2,%%eax; mov $0,%%edx; ret":::"eax","edx"); */
const uint8_t inst[11] = {0xb8U, 0x02U, 0x0U, 0x0U, 0x0U, 0xbaU, 0x0U, 0x0U, 0x0U, 0x0U, 0xc3U};
/*
* All enlightened versions of Windows operating systems invoke guest hypercalls on
* the basis of the recommendations presented by the hypervisor in CPUID.40000004:EAX.
* A conforming hypervisor must return HV_STATUS_INVALID_HYPERCALL_CODE for any
* unimplemented hypercalls.
* ACRN does not wish to handle any hypercalls at moment, the following hypercall
* code page is implemented for this purpose.
* inst32[] for 32 bits:
* mov eax, 0x02 ; HV_STATUS_INVALID_HYPERCALL_CODE
* mov edx, 0
* ret
* inst64[] for 64 bits:
* mov rax, 0x02 ; HV_STATUS_INVALID_HYPERCALL_CODE
* ret
*/
const uint8_t inst32[11] = {0xb8U, 0x02U, 0x0U, 0x0U, 0x0U, 0xbaU, 0x0U, 0x0U, 0x0U, 0x0U, 0xc3U};
const uint8_t inst64[8] = {0x48U, 0xc7U, 0xc0U, 0x02U, 0x0U, 0x0U, 0x0U, 0xc3U};
hypercall.val64 = val;
@ -147,7 +162,11 @@ hyperv_setup_hypercall_page(const struct acrn_vcpu *vcpu, uint64_t val)
if (page_hva != NULL) {
stac();
(void)memset(page_hva, 0U, PAGE_SIZE);
(void)memcpy_s(page_hva, 11U, inst, 11U);
if (get_vcpu_mode(vcpu) == CPU_MODE_64BIT) {
(void)memcpy_s(page_hva, 8U, inst64, 8U);
} else {
(void)memcpy_s(page_hva, 11U, inst32, 11U);
}
clac();
}
}