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hw/loongarch: Add VM mode in IOCSR feature register in kvm mode

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If VM runs in kvm mode, VM mode is added in IOCSR feature register.
So guest can detect kvm hypervisor type and enable possible pv functions.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20240514025109.3238398-1-maobibo@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
This commit is contained in:
Bibo Mao 2024-05-14 10:51:09 +08:00 committed by Song Gao
parent 07c0866103
commit a7701b61f6
1 changed files with 9 additions and 3 deletions
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12
hw/loongarch/virt.c
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@ -10,6 +10,7 @@
#include "qapi/error.h"
#include "hw/boards.h"
#include "hw/char/serial.h"
#include "sysemu/kvm.h"
#include "sysemu/sysemu.h"
#include "sysemu/qtest.h"
#include "sysemu/runstate.h"
@ -840,18 +841,23 @@ static void virt_iocsr_misc_write(void *opaque, hwaddr addr,
static uint64_t virt_iocsr_misc_read(void *opaque, hwaddr addr, unsigned size)
{
uint64_t ret;
switch (addr) {
case VERSION_REG:
return 0x11ULL;
case FEATURE_REG:
return 1ULL << IOCSRF_MSI | 1ULL << IOCSRF_EXTIOI |
1ULL << IOCSRF_CSRIPI;
ret = BIT(IOCSRF_MSI) | BIT(IOCSRF_EXTIOI) | BIT(IOCSRF_CSRIPI);
if (kvm_enabled()) {
ret |= BIT(IOCSRF_VM);
}
return ret;
case VENDOR_REG:
return 0x6e6f73676e6f6f4cULL; /* "Loongson" */
case CPUNAME_REG:
return 0x303030354133ULL; /* "3A5000" */
case MISC_FUNC_REG:
return 1ULL << IOCSRM_EXTIOI_EN;
return BIT_ULL(IOCSRM_EXTIOI_EN);
}
return 0ULL;
}