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LoongArch: KVM: Set host with kernel mode when switch to VM mode

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PRMD register is only meaningful on the beginning stage of exception
entry, and it is overwritten with nested irq or exception.

When CPU runs in VM mode, interrupt need be enabled on host. And the
mode for host had better be kernel mode rather than random or user mode.

When VM is running, the running mode with top command comes from CRMD
register, and running mode should be kernel mode since kernel function
is executing with perf command. It needs be consistent with both top and
perf command.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao 2025-02-13 12:02:56 +08:00 • committed by Huacai Chen
parent d8cc4fee3f
commit 3011b29ec5
1 changed files with 1 additions and 1 deletions
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2
arch/loongarch/kvm/switch.S
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@ -85,7 +85,7 @@
* Guest CRMD comes from separate GCSR_CRMD register
*/
ori t0, zero, CSR_PRMD_PIE
csrxchg t0, t0, LOONGARCH_CSR_PRMD
csrwr t0, LOONGARCH_CSR_PRMD
/* Set PVM bit to setup ertn to guest context */
ori t0, zero, CSR_GSTAT_PVM