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HV: cpu: add msr_read_pcpu()& msr_write_pcpu()

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Use smp_call_function() to read/write MSR register on target PCPU

Tracked-On: #2462
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
2019-01-28 22:15:41 +08:00
committed by wenlingz
parent 39ffd29aa3
commit 648450c62c
2 changed files with 59 additions and 0 deletions
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48
hypervisor/arch/x86/cpu.c
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@@ -416,3 +416,51 @@ static void cpu_xsave_init(void)
}
}
}
static void smpcall_write_msr_func(void *data)
{
struct msr_data_struct *msr = (struct msr_data_struct *)data;
msr_write(msr->msr_index, msr->write_val);
}
void msr_write_pcpu(uint32_t msr_index, uint64_t value64, uint16_t pcpu_id)
{
struct msr_data_struct msr = {0};
uint64_t mask = 0UL;
if (pcpu_id == get_cpu_id()) {
msr_write(msr_index, value64);
} else {
msr.msr_index = msr_index;
msr.write_val = value64;
bitmap_set_nolock(pcpu_id, &mask);
smp_call_function(mask, smpcall_write_msr_func, &msr);
}
}
static void smpcall_read_msr_func(void *data)
{
struct msr_data_struct *msr = (struct msr_data_struct *)data;
msr->read_val = msr_read(msr->msr_index);
}
uint64_t msr_read_pcpu(uint32_t msr_index, uint16_t pcpu_id)
{
struct msr_data_struct msr = {0};
uint64_t mask = 0UL;
uint64_t ret = 0;
if (pcpu_id == get_cpu_id()) {
ret = msr_read(msr_index);
} else {
msr.msr_index = msr_index;
bitmap_set_nolock(pcpu_id, &mask);
smp_call_function(mask, smpcall_read_msr_func, &msr);
ret = msr.read_val;
}
return ret;
}