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hv: add rtcdev emulate vrtc

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Current code would read physical RTC register and return it directly to guest.

This patch would read a base physical RTC time and a base physical TSC time
at initialize stage. Then when guest tries to read vRTC time, ACRN HV would
read the real TSC time and use the TSC offset to calculate the real RTC time.

This patch only support BIN data mode and 24 hour mode.
BCD data mode and 12 hour mode will add in other patch.
The accuracy of clock provided by this patch is limited by TSC, and will
be improved in a following patch also.

Tracked-On: #7440
Signed-off-by: Yuanyuan Zhao <yuanyuan.zhao@linux.intel.com>
Reviewed-by: Junjie Mao <junjie.mao@intel.com>
This commit is contained in:
Yuanyuan Zhao
2022-04-25 10:24:34 +08:00
committed by acrnsi-robot
parent f8de4178e4
commit 23177d0a1d
4 changed files with 416 additions and 13 deletions
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3
hypervisor/include/arch/x86/asm/guest/vm.h
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@@ -21,6 +21,7 @@
#include <vpic.h>
#include <asm/guest/vmx_io.h>
#include <vuart.h>
#include <vrtc.h>
#include <asm/guest/trusty.h>
#include <asm/guest/vcpuid.h>
#include <vpci.h>
@@ -169,7 +170,7 @@ struct acrn_vm {
uint32_t vcpuid_entry_nr, vcpuid_level, vcpuid_xlevel;
struct vcpuid_entry vcpuid_entries[MAX_VM_VCPUID_ENTRIES];
struct acrn_vpci vpci;
uint8_t vrtc_offset;
struct acrn_vrtc vrtc;
uint64_t intr_inject_delay_delta; /* delay of intr injection */
} __aligned(PAGE_SIZE);