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2013-11-07arm/arm64: KVM: MMIO support for BE guestMarc Zyngier1-11/+75
Do the necessary byteswap when host and guest have different views of the universe. Actually, the only case we need to take care of is when the guest is BE. All the other cases are naturally handled. Also be careful about endianness when the data is being memcopy-ed from/to the run buffer. Acked-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-08-11KVM: ARM: Squash len warningChristoffer Dall1-1/+2
The 'len' variable was declared an unsigned and then checked for less than 0, which results in warnings on some compilers. Since len is assigned an int, make it an int. Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
2013-06-26ARM: KVM: don't special case PC when doing an MMIOMarc Zyngier1-6/+0
Admitedly, reading a MMIO register to load PC is very weird. Writing PC to a MMIO register is probably even worse. But the architecture doesn't forbid any of these, and injecting a Prefetch Abort is the wrong thing to do anyway. Remove this check altogether, and let the adventurous guest wander into LaLaLand if they feel compelled to do so. Reported-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
2013-03-06ARM: KVM: Fix length of mmio accessMarc Zyngier1-3/+4
Instead of hardcoding the maximum MMIO access to be 4 bytes, compare it to sizeof(unsigned long), which will do the right thing on both 32 and 64bit systems. Same thing for sign extention. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
2013-03-06ARM: KVM: abstract IL decoding awayMarc Zyngier1-1/+1
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
2013-03-06ARM: KVM: abstract SAS decoding awayMarc Zyngier1-14/+3
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
2013-03-06ARM: KVM: abstract S1TW abort detection awayMarc Zyngier1-1/+1
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
2013-03-06ARM: KVM: abstract (and fix) external abort detection awayMarc Zyngier1-1/+1
Bit 8 is cache maintenance, bit 9 is external abort. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
2013-03-06ARM: KVM: abstract HSR_SRT_{MASK,SHIFT} awayMarc Zyngier1-1/+1
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-03-06ARM: KVM: abstract HSR_SSE awayMarc Zyngier1-1/+1
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
2013-03-06ARM: KVM: abstract HSR_WNR awayMarc Zyngier1-1/+1
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
2013-03-06ARM: KVM: abstract HSR_ISV awayMarc Zyngier1-1/+1
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <cdall@cs.columbia.edu>
2013-03-06ARM: KVM: abstract fault register accessesMarc Zyngier1-11/+11
Instead of directly accessing the fault registers, use proper accessors so the core code can be shared. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-03-06ARM: KVM: convert GP registers from u32 to unsigned longMarc Zyngier1-1/+1
On 32bit ARM, unsigned long is guaranteed to be a 32bit quantity. On 64bit ARM, it is a 64bit quantity. In order to be able to share code between the two architectures, convert the registers to be unsigned long, so the core code can be oblivious of the change. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-02-11ARM: KVM: Initial VGIC infrastructure codeMarc Zyngier1-0/+3
Wire the basic framework code for VGIC support and the initial in-kernel MMIO support code for the VGIC, used for the distributor emulation. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
2013-01-23KVM: ARM: Handle I/O abortsChristoffer Dall1-0/+153
When the guest accesses I/O memory this will create data abort exceptions and they are handled by decoding the HSR information (physical address, read/write, length, register) and forwarding reads and writes to QEMU which performs the device emulation. Certain classes of load/store operations do not support the syndrome information provided in the HSR. We don't support decoding these (patches are available elsewhere), so we report an error to user space in this case. This requires changing the general flow somewhat since new calls to run the VCPU must check if there's a pending MMIO load and perform the write after userspace has made the data available. Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <c.dall@virtualopensystems.com>
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