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hv:io: wrap mmio read/write 

When guest traps and wants to access a mmio region, the ACRN hypervisor
doesn't know the mmio size the guest wants to access until the trap
happens. In this case, ACRN should switch the mmio size and then call
mmio_read8/16/32/64 or mmio_write8/16/32/64 in each trap place.

This patch wrap the mmio read/write with a parameter to assign the mmio
size.

Tracked-On: #8255
Signed-off-by: Fei Li <fei1.li@intel.com>
This commit is contained in:
Fei Li 2022-10-19 11:05:01 +08:00 committed by acrnsi-robot
parent c76f26bdad
commit 65454730de
1 changed files with 38 additions and 0 deletions
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38
hypervisor/include/arch/x86/asm/io.h
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@ -166,4 +166,42 @@ static inline uint8_t mmio_read8(const void *addr)
return *((volatile const uint8_t *)addr);
}
static inline uint64_t mmio_read(const void *addr, uint64_t sz)
{
uint64_t val;
switch (sz) {
case 1U:
val = (uint64_t)mmio_read8(addr);
break;
case 2U:
val = (uint64_t)mmio_read16(addr);
break;
case 4U:
val = (uint64_t)mmio_read32(addr);
break;
default:
val = mmio_read64(addr);
break;
}
return val;
}
static inline void mmio_write(void *addr, uint64_t sz, uint64_t val)
{
switch (sz) {
case 1U:
mmio_write8((uint8_t)val, addr);
break;
case 2U:
mmio_write16((uint16_t)val, addr);
break;
case 4U:
mmio_write32((uint32_t)val, addr);
break;
default:
mmio_write64(val, addr);
break;
}
}
#endif /* _IO_H defined */