diff options
| author | Jinliang Zheng <alexjlzheng@tencent.com> | 2023-04-19 05:19:25 +0300 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2023-06-01 23:44:13 +0300 |
| commit | 0d42522bdee70b9197be63dd76c9f6297cd1e832 (patch) | |
| tree | d5a57b6e605c2722ada4060cf9c27a35840ac48c /arch/x86/kvm/i8259.c | |
| parent | dee321977a230802a5065af4ad4f4f5e8558a738 (diff) | |
| download | linux-0d42522bdee70b9197be63dd76c9f6297cd1e832.tar.xz | |
KVM: x86: Fix poll command
According to the hardware manual, when the Poll command is issued, the
byte returned by the I/O read is 1 in Bit 7 when there is an interrupt,
and the highest priority binary code in Bits 2:0. The current pic
simulation code is not implemented strictly according to the above
expression.
Fix the implementation of pic_poll_read(), set Bit 7 when there is an
interrupt.
Signed-off-by: Jinliang Zheng <alexjlzheng@tencent.com>
Link: https://lore.kernel.org/r/20230419021924.1342184-1-alexjlzheng@tencent.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/i8259.c')
| -rw-r--r-- | arch/x86/kvm/i8259.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kvm/i8259.c b/arch/x86/kvm/i8259.c index 4756bcb5724f..8dec646e764b 100644 --- a/arch/x86/kvm/i8259.c +++ b/arch/x86/kvm/i8259.c @@ -411,7 +411,10 @@ static u32 pic_poll_read(struct kvm_kpic_state *s, u32 addr1) pic_clear_isr(s, ret); if (addr1 >> 7 || ret != 2) pic_update_irq(s->pics_state); + /* Bit 7 is 1, means there's an interrupt */ + ret |= 0x80; } else { + /* Bit 7 is 0, means there's no interrupt */ ret = 0x07; pic_update_irq(s->pics_state); } |