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HV: Config Splitlock Detection to be disable

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#AC should be normally enabled for slpitlock detection, however,
community developers may want to run ACRN on buggy system.
In this case, CONFIG_ENFORCE_TURNOFF_AC can be used to turn off the
 #AC, to let the guest run without #AC.

Tracked-On: #4765
Signed-off-by: Tao Yuhong <yuhong.tao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
yuhong.tao@intel.com 2020-04-29 21:02:41 +08:00 committed by wenlingz
parent bf5d187539
commit b0ae9cfa2b
2 changed files with 9 additions and 0 deletions
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7
hypervisor/arch/x86/Kconfig
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@ -337,3 +337,10 @@ config IOMMU_ENFORCE_SNP
help help
GPU IOMMU doesn't support snoop control capability, GPU IOMMU doesn't support snoop control capability,
To enable gvt-d,disable IOMMU snoop control by default. To enable gvt-d,disable IOMMU snoop control by default.
config ENFORCE_TURNOFF_AC
bool "Force to disable #AC for Split-locked Access"
default n
help
If CPU has #AC for split-locked access, HV enable it and VMs can't disable.
Set this to enforce turn off that #AC, for community developer only.

2
hypervisor/arch/x86/cpu.c
View File

@ -100,6 +100,7 @@ uint64_t get_active_pcpu_bitmap(void)
static void enable_ac_for_splitlock(void) static void enable_ac_for_splitlock(void)
{ {
#ifdef CONFIG_ENFORCE_TURNOFF_AC
uint64_t test_ctl; uint64_t test_ctl;
if (has_core_cap(1U << 5U)) { if (has_core_cap(1U << 5U)) {
@ -107,6 +108,7 @@ static void enable_ac_for_splitlock(void)
test_ctl |= (1U << 29U); test_ctl |= (1U << 29U);
msr_write(MSR_TEST_CTL, test_ctl); msr_write(MSR_TEST_CTL, test_ctl);
} }
#endif /*CONFIG_ENFORCE_TURNOFF_AC*/
} }
void init_pcpu_pre(bool is_bsp) void init_pcpu_pre(bool is_bsp)